BaseRegionObserver (Apache HBase 1.1.7 API)

java.lang.Object
- org.apache.hadoop.hbase.coprocessor.BaseRegionObserver

All Implemented Interfaces:

Coprocessor, RegionObserver

Direct Known Subclasses:

BaseMasterAndRegionObserver, ConstraintProcessor, WriteSinkCoprocessor, ZooKeeperScanPolicyObserver
```
@InterfaceAudience.LimitedPrivate(value="Coprocesssor")
@InterfaceStability.Evolving
public abstract class BaseRegionObserver
extends Object
implements RegionObserver
```
An abstract class that implements RegionObserver. By extending it, you can create your own region observer without overriding all abstract methods of RegionObserver.

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.coprocessor.RegionObserver
  RegionObserver.MutationType
- Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.Coprocessor
  Coprocessor.State

Field Summary
- Fields inherited from interface org.apache.hadoop.hbase.Coprocessor
  PRIORITY_HIGHEST, PRIORITY_LOWEST, PRIORITY_SYSTEM, PRIORITY_USER, VERSION

Constructor Summary

Constructors
Constructor and Description

BaseRegionObserver()

Constructors
Constructor and Description
`BaseRegionObserver()`

Method Summary

Methods
Modifier and Type	Method and Description
`Result`	`postAppend(ObserverContext<RegionCoprocessorEnvironment> e, Append append, Result result)` Called after Append
`void`	`postBatchMutate(ObserverContext<RegionCoprocessorEnvironment> c, MiniBatchOperationInProgress<Mutation> miniBatchOp)` This will be called after applying a batch of Mutations on a region.
`void`	`postBatchMutateIndispensably(ObserverContext<RegionCoprocessorEnvironment> ctx, MiniBatchOperationInProgress<Mutation> miniBatchOp, boolean success)` Called after the completion of batch put/delete and will be called even if the batch operation fails
`boolean`	`postBulkLoadHFile(ObserverContext<RegionCoprocessorEnvironment> ctx, List<Pair<byte[],String>> familyPaths, boolean hasLoaded)` Called after bulkLoadHFile.
`boolean`	`postCheckAndDelete(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, byte[] qualifier, CompareFilter.CompareOp compareOp, ByteArrayComparable comparator, Delete delete, boolean result)` Called after checkAndDelete
`boolean`	`postCheckAndPut(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, byte[] qualifier, CompareFilter.CompareOp compareOp, ByteArrayComparable comparator, Put put, boolean result)` Called after checkAndPut
`void`	`postClose(ObserverContext<RegionCoprocessorEnvironment> e, boolean abortRequested)` Called after the region is reported as closed to the master.
`void`	`postCloseRegionOperation(ObserverContext<RegionCoprocessorEnvironment> ctx, Region.Operation op)` Called after releasing read lock in `Region.closeRegionOperation()`.
`void`	`postCompact(ObserverContext<RegionCoprocessorEnvironment> e, Store store, StoreFile resultFile)` Called after compaction has completed and the new store file has been moved in to place.
`void`	`postCompact(ObserverContext<RegionCoprocessorEnvironment> e, Store store, StoreFile resultFile, CompactionRequest request)` Called after compaction has completed and the new store file has been moved in to place.
`void`	`postCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c, Store store, com.google.common.collect.ImmutableList<StoreFile> selected)` Called after the `StoreFile`s to compact have been selected from the available candidates.
`void`	`postCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c, Store store, com.google.common.collect.ImmutableList<StoreFile> selected, CompactionRequest request)` Called after the `StoreFile`s to compact have been selected from the available candidates.
`void`	`postCompleteSplit(ObserverContext<RegionCoprocessorEnvironment> ctx)` Called after any split request is processed.
`void`	`postDelete(ObserverContext<RegionCoprocessorEnvironment> e, Delete delete, WALEdit edit, Durability durability)` Called after the client deletes a value.
`boolean`	`postExists(ObserverContext<RegionCoprocessorEnvironment> e, Get get, boolean exists)` Called after the client tests for existence using a Get.
`void`	`postFlush(ObserverContext<RegionCoprocessorEnvironment> e)` Called after the memstore is flushed to disk.
`void`	`postFlush(ObserverContext<RegionCoprocessorEnvironment> e, Store store, StoreFile resultFile)` Called after a Store's memstore is flushed to disk.
`void`	`postGetClosestRowBefore(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, Result result)` Called after a client makes a GetClosestRowBefore request.
`void`	`postGetOp(ObserverContext<RegionCoprocessorEnvironment> e, Get get, List<Cell> results)` Called after the client performs a Get
`Result`	`postIncrement(ObserverContext<RegionCoprocessorEnvironment> e, Increment increment, Result result)` Called after increment
`long`	`postIncrementColumnValue(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, byte[] qualifier, long amount, boolean writeToWAL, long result)` Called after incrementColumnValue
`DeleteTracker`	`postInstantiateDeleteTracker(ObserverContext<RegionCoprocessorEnvironment> ctx, DeleteTracker delTracker)` Called after the ScanQueryMatcher creates ScanDeleteTracker.
`void`	`postLogReplay(ObserverContext<RegionCoprocessorEnvironment> e)` Called after the log replay on the region is over.
`Cell`	`postMutationBeforeWAL(ObserverContext<RegionCoprocessorEnvironment> ctx, RegionObserver.MutationType opType, Mutation mutation, Cell oldCell, Cell newCell)` Called after a new cell has been created during an increment operation, but before it is committed to the WAL or memstore.
`void`	`postOpen(ObserverContext<RegionCoprocessorEnvironment> e)` Called after the region is reported as open to the master.
`void`	`postPut(ObserverContext<RegionCoprocessorEnvironment> e, Put put, WALEdit edit, Durability durability)` Called after the client stores a value.
`void`	`postRollBackSplit(ObserverContext<RegionCoprocessorEnvironment> ctx)` This will be called after the roll back of the split region is completed
`void`	`postScannerClose(ObserverContext<RegionCoprocessorEnvironment> e, InternalScanner s)` Called after the client closes a scanner.
`boolean`	`postScannerFilterRow(ObserverContext<RegionCoprocessorEnvironment> e, InternalScanner s, byte[] currentRow, int offset, short length, boolean hasMore)` This will be called by the scan flow when the current scanned row is being filtered out by the filter.
`boolean`	`postScannerNext(ObserverContext<RegionCoprocessorEnvironment> e, InternalScanner s, List<Result> results, int limit, boolean hasMore)` Called after the client asks for the next row on a scanner.
`RegionScanner`	`postScannerOpen(ObserverContext<RegionCoprocessorEnvironment> e, Scan scan, RegionScanner s)` Called after the client opens a new scanner.
`void`	`postSplit(ObserverContext<RegionCoprocessorEnvironment> e, Region l, Region r)` Called after the region is split.
`void`	`postStartRegionOperation(ObserverContext<RegionCoprocessorEnvironment> ctx, Region.Operation op)` This will be called for region operations where read lock is acquired in `Region.startRegionOperation()`.
`StoreFile.Reader`	`postStoreFileReaderOpen(ObserverContext<RegionCoprocessorEnvironment> ctx, org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path p, FSDataInputStreamWrapper in, long size, CacheConfig cacheConf, Reference r, StoreFile.Reader reader)` Called after the creation of Reader for a store file.
`void`	`postWALRestore(ObserverContext<? extends RegionCoprocessorEnvironment> env, HRegionInfo info, WALKey logKey, WALEdit logEdit)` Implementers should override this version of the method and leave the deprecated one as-is.
`void`	`postWALRestore(ObserverContext<RegionCoprocessorEnvironment> env, HRegionInfo info, HLogKey logKey, WALEdit logEdit)` Called after a `WALEdit` replayed for this region.
`Result`	`preAppend(ObserverContext<RegionCoprocessorEnvironment> e, Append append)` Called before Append.
`Result`	`preAppendAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> e, Append append)` Called before Append but after acquiring rowlock.
`void`	`preBatchMutate(ObserverContext<RegionCoprocessorEnvironment> c, MiniBatchOperationInProgress<Mutation> miniBatchOp)` This will be called for every batch mutation operation happening at the server.
`void`	`preBulkLoadHFile(ObserverContext<RegionCoprocessorEnvironment> ctx, List<Pair<byte[],String>> familyPaths)` Called before bulkLoadHFile.
`boolean`	`preCheckAndDelete(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, byte[] qualifier, CompareFilter.CompareOp compareOp, ByteArrayComparable comparator, Delete delete, boolean result)` Called before checkAndDelete.
`boolean`	`preCheckAndDeleteAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, byte[] qualifier, CompareFilter.CompareOp compareOp, ByteArrayComparable comparator, Delete delete, boolean result)` Called before checkAndDelete but after acquiring rowock.
`boolean`	`preCheckAndPut(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, byte[] qualifier, CompareFilter.CompareOp compareOp, ByteArrayComparable comparator, Put put, boolean result)` Called before checkAndPut.
`boolean`	`preCheckAndPutAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, byte[] qualifier, CompareFilter.CompareOp compareOp, ByteArrayComparable comparator, Put put, boolean result)` Called before checkAndPut but after acquiring rowlock.
`void`	`preClose(ObserverContext<RegionCoprocessorEnvironment> c, boolean abortRequested)` Called before the region is reported as closed to the master.
`InternalScanner`	`preCompact(ObserverContext<RegionCoprocessorEnvironment> e, Store store, InternalScanner scanner, ScanType scanType)` Called prior to writing the `StoreFile`s selected for compaction into a new `StoreFile`.
`InternalScanner`	`preCompact(ObserverContext<RegionCoprocessorEnvironment> e, Store store, InternalScanner scanner, ScanType scanType, CompactionRequest request)` Called prior to writing the `StoreFile`s selected for compaction into a new `StoreFile`.
`InternalScanner`	`preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store, List<? extends KeyValueScanner> scanners, ScanType scanType, long earliestPutTs, InternalScanner s)` Called prior to writing the `StoreFile`s selected for compaction into a new `StoreFile` and prior to creating the scanner used to read the input files.
`InternalScanner`	`preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store, List<? extends KeyValueScanner> scanners, ScanType scanType, long earliestPutTs, InternalScanner s, CompactionRequest request)` Called prior to writing the `StoreFile`s selected for compaction into a new `StoreFile` and prior to creating the scanner used to read the input files.
`void`	`preCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c, Store store, List<StoreFile> candidates)` Called prior to selecting the `StoreFile`s to compact from the list of available candidates.
`void`	`preCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c, Store store, List<StoreFile> candidates, CompactionRequest request)` Called prior to selecting the `StoreFiles` to compact from the list of available candidates.
`void`	`preDelete(ObserverContext<RegionCoprocessorEnvironment> e, Delete delete, WALEdit edit, Durability durability)` Called before the client deletes a value.
`boolean`	`preExists(ObserverContext<RegionCoprocessorEnvironment> e, Get get, boolean exists)` Called before the client tests for existence using a Get.
`void`	`preFlush(ObserverContext<RegionCoprocessorEnvironment> e)` Called before the memstore is flushed to disk.
`InternalScanner`	`preFlush(ObserverContext<RegionCoprocessorEnvironment> e, Store store, InternalScanner scanner)` Called before a Store's memstore is flushed to disk.
`InternalScanner`	`preFlushScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store, KeyValueScanner memstoreScanner, InternalScanner s)` Called before a memstore is flushed to disk and prior to creating the scanner to read from the memstore.
`void`	`preGetClosestRowBefore(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, Result result)` Called before a client makes a GetClosestRowBefore request.
`void`	`preGetOp(ObserverContext<RegionCoprocessorEnvironment> e, Get get, List<Cell> results)` Called before the client performs a Get
`Result`	`preIncrement(ObserverContext<RegionCoprocessorEnvironment> e, Increment increment)` Called before Increment.
`Result`	`preIncrementAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> e, Increment increment)` Called before Increment but after acquiring rowlock.
`long`	`preIncrementColumnValue(ObserverContext<RegionCoprocessorEnvironment> e, byte[] row, byte[] family, byte[] qualifier, long amount, boolean writeToWAL)` Called before incrementColumnValue
`void`	`preOpen(ObserverContext<RegionCoprocessorEnvironment> e)` Called before the region is reported as open to the master.
`void`	`prePrepareTimeStampForDeleteVersion(ObserverContext<RegionCoprocessorEnvironment> e, Mutation delete, Cell cell, byte[] byteNow, Get get)` Called before the server updates the timestamp for version delete with latest timestamp.
`void`	`prePut(ObserverContext<RegionCoprocessorEnvironment> e, Put put, WALEdit edit, Durability durability)` Called before the client stores a value.
`void`	`preRollBackSplit(ObserverContext<RegionCoprocessorEnvironment> ctx)` This will be called before the roll back of the split region is completed
`void`	`preScannerClose(ObserverContext<RegionCoprocessorEnvironment> e, InternalScanner s)` Called before the client closes a scanner.
`boolean`	`preScannerNext(ObserverContext<RegionCoprocessorEnvironment> e, InternalScanner s, List<Result> results, int limit, boolean hasMore)` Called before the client asks for the next row on a scanner.
`RegionScanner`	`preScannerOpen(ObserverContext<RegionCoprocessorEnvironment> e, Scan scan, RegionScanner s)` Called before the client opens a new scanner.
`void`	`preSplit(ObserverContext<RegionCoprocessorEnvironment> e)` Called before the region is split.
`void`	`preSplit(ObserverContext<RegionCoprocessorEnvironment> c, byte[] splitRow)` Called before the region is split.
`void`	`preSplitAfterPONR(ObserverContext<RegionCoprocessorEnvironment> ctx)` This will be called after PONR step as part of split transaction Calling `ObserverContext.bypass()` has no effect in this hook.
`void`	`preSplitBeforePONR(ObserverContext<RegionCoprocessorEnvironment> ctx, byte[] splitKey, List<Mutation> metaEntries)` This will be called before PONR step as part of split transaction.
`StoreFile.Reader`	`preStoreFileReaderOpen(ObserverContext<RegionCoprocessorEnvironment> ctx, org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path p, FSDataInputStreamWrapper in, long size, CacheConfig cacheConf, Reference r, StoreFile.Reader reader)` Called before creation of Reader for a store file.
`KeyValueScanner`	`preStoreScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store, Scan scan, NavigableSet<byte[]> targetCols, KeyValueScanner s)` Called before a store opens a new scanner.
`void`	`preWALRestore(ObserverContext<? extends RegionCoprocessorEnvironment> env, HRegionInfo info, WALKey logKey, WALEdit logEdit)` Implementers should override this version of the method and leave the deprecated one as-is.
`void`	`preWALRestore(ObserverContext<RegionCoprocessorEnvironment> env, HRegionInfo info, HLogKey logKey, WALEdit logEdit)` Called before a `WALEdit` replayed for this region.
`void`	`start(CoprocessorEnvironment e)`
`void`	`stop(CoprocessorEnvironment e)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - BaseRegionObserver
```
public BaseRegionObserver()
```
- Method Detail
  - start
```
public void start(CoprocessorEnvironment e)
           throws IOException
```
    Specified by:
    
    start in interface Coprocessor
    
    Throws:
    
    IOException
  - stop
```
public void stop(CoprocessorEnvironment e)
          throws IOException
```
    Specified by:
    
    stop in interface Coprocessor
    
    Throws:
    
    IOException
  - preOpen
```
public void preOpen(ObserverContext<RegionCoprocessorEnvironment> e)
             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the region is reported as open to the master.
    
    Specified by:
    
    preOpen in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postOpen
```
public void postOpen(ObserverContext<RegionCoprocessorEnvironment> e)
```
    Description copied from interface: RegionObserver
    
    Called after the region is reported as open to the master.
    
    Specified by:
    
    postOpen in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
  - postLogReplay
```
public void postLogReplay(ObserverContext<RegionCoprocessorEnvironment> e)
```
    Description copied from interface: RegionObserver
    
    Called after the log replay on the region is over.
    
    Specified by:
    
    postLogReplay in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
  - preClose
```
public void preClose(ObserverContext<RegionCoprocessorEnvironment> c,
            boolean abortRequested)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the region is reported as closed to the master.
    
    Specified by:
    
    preClose in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    abortRequested - true if the region server is aborting
    
    Throws:
    
    IOException
  - postClose
```
public void postClose(ObserverContext<RegionCoprocessorEnvironment> e,
             boolean abortRequested)
```
    Description copied from interface: RegionObserver
    
    Called after the region is reported as closed to the master.
    
    Specified by:
    
    postClose in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    abortRequested - true if the region server is aborting
  - preFlushScannerOpen
```
public InternalScanner preFlushScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
                                  Store store,
                                  KeyValueScanner memstoreScanner,
                                  InternalScanner s)
                                    throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before a memstore is flushed to disk and prior to creating the scanner to read from the memstore. To override or modify how a memstore is flushed, implementing classes can return a new scanner to provide the KeyValues to be stored into the new StoreFile or null to perform the default processing. Calling ObserverContext.bypass() has no effect in this hook.
    
    Specified by:
    
    preFlushScannerOpen in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    store - the store being flushed
    memstoreScanner - the scanner for the memstore that is flushed
    s - the base scanner, if not null, from previous RegionObserver in the chain
    
    Returns:
    the scanner to use during the flush. null if the default implementation is to be used.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preFlush
```
public void preFlush(ObserverContext<RegionCoprocessorEnvironment> e)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the memstore is flushed to disk.
    
    Specified by:
    
    preFlush in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postFlush
```
public void postFlush(ObserverContext<RegionCoprocessorEnvironment> e)
               throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the memstore is flushed to disk.
    
    Specified by:
    
    postFlush in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preFlush
```
public InternalScanner preFlush(ObserverContext<RegionCoprocessorEnvironment> e,
                       Store store,
                       InternalScanner scanner)
                         throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before a Store's memstore is flushed to disk.
    
    Specified by:
    
    preFlush in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    store - the store where compaction is being requested
    scanner - the scanner over existing data used in the store file
    
    Returns:
    the scanner to use during compaction. Should not be null unless the implementation is writing new store files on its own.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postFlush
```
public void postFlush(ObserverContext<RegionCoprocessorEnvironment> e,
             Store store,
             StoreFile resultFile)
               throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after a Store's memstore is flushed to disk.
    
    Specified by:
    
    postFlush in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    store - the store being flushed
    resultFile - the new store file written out during compaction
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preSplit
```
public void preSplit(ObserverContext<RegionCoprocessorEnvironment> e)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the region is split.
    
    Specified by:
    
    preSplit in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server (e.getRegion() returns the parent region)
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preSplit
```
public void preSplit(ObserverContext<RegionCoprocessorEnvironment> c,
            byte[] splitRow)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the region is split.
    
    Specified by:
    
    preSplit in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server (e.getRegion() returns the parent region)
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preSplitBeforePONR
```
public void preSplitBeforePONR(ObserverContext<RegionCoprocessorEnvironment> ctx,
                      byte[] splitKey,
                      List<Mutation> metaEntries)
                        throws IOException
```
    Description copied from interface: RegionObserver
    
    This will be called before PONR step as part of split transaction. Calling ObserverContext.bypass() rollback the split
    
    Specified by:
    
    preSplitBeforePONR in interface RegionObserver
    
    Throws:
    
    IOException
  - preSplitAfterPONR
```
public void preSplitAfterPONR(ObserverContext<RegionCoprocessorEnvironment> ctx)
                       throws IOException
```
    Description copied from interface: RegionObserver
    
    This will be called after PONR step as part of split transaction Calling ObserverContext.bypass() has no effect in this hook.
    
    Specified by:
    
    preSplitAfterPONR in interface RegionObserver
    
    Throws:
    
    IOException
  - preRollBackSplit
```
public void preRollBackSplit(ObserverContext<RegionCoprocessorEnvironment> ctx)
                      throws IOException
```
    Description copied from interface: RegionObserver
    
    This will be called before the roll back of the split region is completed
    
    Specified by:
    
    preRollBackSplit in interface RegionObserver
    
    Throws:
    
    IOException
  - postRollBackSplit
```
public void postRollBackSplit(ObserverContext<RegionCoprocessorEnvironment> ctx)
                       throws IOException
```
    Description copied from interface: RegionObserver
    
    This will be called after the roll back of the split region is completed
    
    Specified by:
    
    postRollBackSplit in interface RegionObserver
    
    Throws:
    
    IOException
  - postCompleteSplit
```
public void postCompleteSplit(ObserverContext<RegionCoprocessorEnvironment> ctx)
                       throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after any split request is processed. This will be called irrespective of success or failure of the split.
    
    Specified by:
    
    postCompleteSplit in interface RegionObserver
    
    Throws:
    
    IOException
  - postSplit
```
public void postSplit(ObserverContext<RegionCoprocessorEnvironment> e,
             Region l,
             Region r)
               throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the region is split.
    
    Specified by:
    
    postSplit in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server (e.getRegion() returns the parent region)
    l - the left daughter region
    r - the right daughter region
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCompactSelection
```
public void preCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c,
                       Store store,
                       List<StoreFile> candidates)
                         throws IOException
```
    Description copied from interface: RegionObserver
    
    Called prior to selecting the StoreFiles to compact from the list of available candidates. To alter the files used for compaction, you may mutate the passed in list of candidates.
    
    Specified by:
    
    preCompactSelection in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    store - the store where compaction is being requested
    candidates - the store files currently available for compaction
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCompactSelection
```
public void preCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c,
                       Store store,
                       List<StoreFile> candidates,
                       CompactionRequest request)
                         throws IOException
```
    Description copied from interface: RegionObserver
    
    Called prior to selecting the StoreFiles to compact from the list of available candidates. To alter the files used for compaction, you may mutate the passed in list of candidates.
    
    Specified by:
    
    preCompactSelection in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    store - the store where compaction is being requested
    candidates - the store files currently available for compaction
    request - custom compaction request
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postCompactSelection
```
public void postCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c,
                        Store store,
                        com.google.common.collect.ImmutableList<StoreFile> selected)
```
    Description copied from interface: RegionObserver
    
    Called after the StoreFiles to compact have been selected from the available candidates.
    
    Specified by:
    
    postCompactSelection in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    store - the store being compacted
    selected - the store files selected to compact
  - postCompactSelection
```
public void postCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c,
                        Store store,
                        com.google.common.collect.ImmutableList<StoreFile> selected,
                        CompactionRequest request)
```
    Description copied from interface: RegionObserver
    
    Called after the StoreFiles to compact have been selected from the available candidates.
    
    Specified by:
    
    postCompactSelection in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    store - the store being compacted
    selected - the store files selected to compact
    request - custom compaction request
  - preCompact
```
public InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> e,
                         Store store,
                         InternalScanner scanner,
                         ScanType scanType)
                           throws IOException
```
    Description copied from interface: RegionObserver
    Called prior to writing the StoreFiles selected for compaction into a new StoreFile. To override or modify the compaction process, implementing classes have two options:
    - Wrap the provided InternalScanner with a custom implementation that is returned from this method. The custom scanner can then inspect KeyValues from the wrapped scanner, applying its own policy to what gets written.
    - Call ObserverContext.bypass() and provide a custom implementation for writing of new StoreFiles. Note: any implementations bypassing core compaction using this approach must write out new store files themselves or the existing data will no longer be available after compaction.
    Specified by:
    
    preCompact in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    store - the store being compacted
    scanner - the scanner over existing data used in the store file rewriting
    scanType - type of Scan
    
    Returns:
    the scanner to use during compaction. Should not be null unless the implementation is writing new store files on its own.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCompact
```
public InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> e,
                         Store store,
                         InternalScanner scanner,
                         ScanType scanType,
                         CompactionRequest request)
                           throws IOException
```
    Description copied from interface: RegionObserver
    Called prior to writing the StoreFiles selected for compaction into a new StoreFile. To override or modify the compaction process, implementing classes have two options:
    - Wrap the provided InternalScanner with a custom implementation that is returned from this method. The custom scanner can then inspect KeyValues from the wrapped scanner, applying its own policy to what gets written.
    - Call ObserverContext.bypass() and provide a custom implementation for writing of new StoreFiles. Note: any implementations bypassing core compaction using this approach must write out new store files themselves or the existing data will no longer be available after compaction.
    Specified by:
    
    preCompact in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    store - the store being compacted
    scanner - the scanner over existing data used in the store file rewriting
    scanType - type of Scan
    request - the requested compaction
    
    Returns:
    the scanner to use during compaction. Should not be null unless the implementation is writing new store files on its own.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCompactScannerOpen
```
public InternalScanner preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
                                    Store store,
                                    List<? extends KeyValueScanner> scanners,
                                    ScanType scanType,
                                    long earliestPutTs,
                                    InternalScanner s)
                                      throws IOException
```
    Description copied from interface: RegionObserver
    
    Called prior to writing the StoreFiles selected for compaction into a new StoreFile and prior to creating the scanner used to read the input files. To override or modify the compaction process, implementing classes can return a new scanner to provide the KeyValues to be stored into the new StoreFile or null to perform the default processing. Calling ObserverContext.bypass() has no effect in this hook.
    
    Specified by:
    
    preCompactScannerOpen in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    store - the store being compacted
    scanners - the list StoreFileScanners to be read from
    scanType - the ScanType indicating whether this is a major or minor compaction
    earliestPutTs - timestamp of the earliest put that was found in any of the involved store files
    s - the base scanner, if not null, from previous RegionObserver in the chain
    
    Returns:
    the scanner to use during compaction. null if the default implementation is to be used.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCompactScannerOpen
```
public InternalScanner preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
                                    Store store,
                                    List<? extends KeyValueScanner> scanners,
                                    ScanType scanType,
                                    long earliestPutTs,
                                    InternalScanner s,
                                    CompactionRequest request)
                                      throws IOException
```
    Description copied from interface: RegionObserver
    
    Called prior to writing the StoreFiles selected for compaction into a new StoreFile and prior to creating the scanner used to read the input files. To override or modify the compaction process, implementing classes can return a new scanner to provide the KeyValues to be stored into the new StoreFile or null to perform the default processing. Calling ObserverContext.bypass() has no effect in this hook.
    
    Specified by:
    
    preCompactScannerOpen in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    store - the store being compacted
    scanners - the list StoreFileScanners to be read from
    scanType - the ScanType indicating whether this is a major or minor compaction
    earliestPutTs - timestamp of the earliest put that was found in any of the involved store files
    s - the base scanner, if not null, from previous RegionObserver in the chain
    request - the requested compaction
    
    Returns:
    the scanner to use during compaction. null if the default implementation is to be used.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postCompact
```
public void postCompact(ObserverContext<RegionCoprocessorEnvironment> e,
               Store store,
               StoreFile resultFile)
                 throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after compaction has completed and the new store file has been moved in to place.
    
    Specified by:
    
    postCompact in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    store - the store being compacted
    resultFile - the new store file written out during compaction
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postCompact
```
public void postCompact(ObserverContext<RegionCoprocessorEnvironment> e,
               Store store,
               StoreFile resultFile,
               CompactionRequest request)
                 throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after compaction has completed and the new store file has been moved in to place.
    
    Specified by:
    
    postCompact in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    store - the store being compacted
    resultFile - the new store file written out during compaction
    request - the requested compaction
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preGetClosestRowBefore
```
public void preGetClosestRowBefore(ObserverContext<RegionCoprocessorEnvironment> e,
                          byte[] row,
                          byte[] family,
                          Result result)
                            throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before a client makes a GetClosestRowBefore request.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preGetClosestRowBefore in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - the row
    family - the family
    result - The result to return to the client if default processing is bypassed. Can be modified. Will not be used if default processing is not bypassed.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postGetClosestRowBefore
```
public void postGetClosestRowBefore(ObserverContext<RegionCoprocessorEnvironment> e,
                           byte[] row,
                           byte[] family,
                           Result result)
                             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after a client makes a GetClosestRowBefore request.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postGetClosestRowBefore in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - the row
    family - the desired family
    result - the result to return to the client, modify as necessary
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preGetOp
```
public void preGetOp(ObserverContext<RegionCoprocessorEnvironment> e,
            Get get,
            List<Cell> results)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client performs a Get
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preGetOp in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    get - the Get request
    results - The result to return to the client if default processing is bypassed. Can be modified. Will not be used if default processing is not bypassed.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postGetOp
```
public void postGetOp(ObserverContext<RegionCoprocessorEnvironment> e,
             Get get,
             List<Cell> results)
               throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client performs a Get
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postGetOp in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    get - the Get request
    results - the result to return to the client, modify as necessary
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preExists
```
public boolean preExists(ObserverContext<RegionCoprocessorEnvironment> e,
                Get get,
                boolean exists)
                  throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client tests for existence using a Get.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preExists in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    get - the Get request
    
    Returns:
    the value to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postExists
```
public boolean postExists(ObserverContext<RegionCoprocessorEnvironment> e,
                 Get get,
                 boolean exists)
                   throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client tests for existence using a Get.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postExists in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    get - the Get request
    exists - the result returned by the region server
    
    Returns:
    the result to return to the client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - prePut
```
public void prePut(ObserverContext<RegionCoprocessorEnvironment> e,
          Put put,
          WALEdit edit,
          Durability durability)
            throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client stores a value.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    prePut in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    put - The Put object
    edit - The WALEdit object that will be written to the wal
    durability - Persistence guarantee for this Put
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postPut
```
public void postPut(ObserverContext<RegionCoprocessorEnvironment> e,
           Put put,
           WALEdit edit,
           Durability durability)
             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client stores a value.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postPut in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    put - The Put object
    edit - The WALEdit object for the wal
    durability - Persistence guarantee for this Put
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preDelete
```
public void preDelete(ObserverContext<RegionCoprocessorEnvironment> e,
             Delete delete,
             WALEdit edit,
             Durability durability)
               throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client deletes a value.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preDelete in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    delete - The Delete object
    edit - The WALEdit object for the wal
    durability - Persistence guarantee for this Delete
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - prePrepareTimeStampForDeleteVersion
```
public void prePrepareTimeStampForDeleteVersion(ObserverContext<RegionCoprocessorEnvironment> e,
                                       Mutation delete,
                                       Cell cell,
                                       byte[] byteNow,
                                       Get get)
                                         throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the server updates the timestamp for version delete with latest timestamp.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    prePrepareTimeStampForDeleteVersion in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    delete - - the parent mutation associated with this delete cell
    cell - - The deleteColumn with latest version cell
    byteNow - - timestamp bytes
    get - - the get formed using the current cell's row. Note that the get does not specify the family and qualifier
    
    Throws:
    
    IOException
  - postDelete
```
public void postDelete(ObserverContext<RegionCoprocessorEnvironment> e,
              Delete delete,
              WALEdit edit,
              Durability durability)
                throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client deletes a value.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postDelete in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    delete - The Delete object
    edit - The WALEdit object for the wal
    durability - Persistence guarantee for this Delete
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preBatchMutate
```
public void preBatchMutate(ObserverContext<RegionCoprocessorEnvironment> c,
                  MiniBatchOperationInProgress<Mutation> miniBatchOp)
                    throws IOException
```
    Description copied from interface: RegionObserver
    
    This will be called for every batch mutation operation happening at the server. This will be called after acquiring the locks on the mutating rows and after applying the proper timestamp for each Mutation at the server. The batch may contain Put/Delete. By setting OperationStatus of Mutations (MiniBatchOperationInProgress.setOperationStatus(int, OperationStatus)), RegionObserver can make Region to skip these Mutations.
    
    Specified by:
    
    preBatchMutate in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    miniBatchOp - batch of Mutations getting applied to region.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postBatchMutate
```
public void postBatchMutate(ObserverContext<RegionCoprocessorEnvironment> c,
                   MiniBatchOperationInProgress<Mutation> miniBatchOp)
                     throws IOException
```
    Description copied from interface: RegionObserver
    
    This will be called after applying a batch of Mutations on a region. The Mutations are added to memstore and WAL.
    
    Specified by:
    
    postBatchMutate in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    miniBatchOp - batch of Mutations applied to region.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postBatchMutateIndispensably
```
public void postBatchMutateIndispensably(ObserverContext<RegionCoprocessorEnvironment> ctx,
                                MiniBatchOperationInProgress<Mutation> miniBatchOp,
                                boolean success)
                                  throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the completion of batch put/delete and will be called even if the batch operation fails
    
    Specified by:
    
    postBatchMutateIndispensably in interface RegionObserver
    
    success - true if batch operation is successful otherwise false.
    
    Throws:
    
    IOException
  - preCheckAndPut
```
public boolean preCheckAndPut(ObserverContext<RegionCoprocessorEnvironment> e,
                     byte[] row,
                     byte[] family,
                     byte[] qualifier,
                     CompareFilter.CompareOp compareOp,
                     ByteArrayComparable comparator,
                     Put put,
                     boolean result)
                       throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before checkAndPut.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preCheckAndPut in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    compareOp - the comparison operation
    comparator - the comparator
    put - data to put if check succeeds
    
    Returns:
    the return value to return to client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCheckAndPutAfterRowLock
```
public boolean preCheckAndPutAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> e,
                                 byte[] row,
                                 byte[] family,
                                 byte[] qualifier,
                                 CompareFilter.CompareOp compareOp,
                                 ByteArrayComparable comparator,
                                 Put put,
                                 boolean result)
                                   throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before checkAndPut but after acquiring rowlock.
    Note: Caution to be taken for not doing any long time operation in this hook. Row will be locked for longer time. Trying to acquire lock on another row, within this, can lead to potential deadlock.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preCheckAndPutAfterRowLock in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    compareOp - the comparison operation
    comparator - the comparator
    put - data to put if check succeeds
    
    Returns:
    the return value to return to client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postCheckAndPut
```
public boolean postCheckAndPut(ObserverContext<RegionCoprocessorEnvironment> e,
                      byte[] row,
                      byte[] family,
                      byte[] qualifier,
                      CompareFilter.CompareOp compareOp,
                      ByteArrayComparable comparator,
                      Put put,
                      boolean result)
                        throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after checkAndPut
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postCheckAndPut in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    compareOp - the comparison operation
    comparator - the comparator
    put - data to put if check succeeds
    result - from the checkAndPut
    
    Returns:
    the possibly transformed return value to return to client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCheckAndDelete
```
public boolean preCheckAndDelete(ObserverContext<RegionCoprocessorEnvironment> e,
                        byte[] row,
                        byte[] family,
                        byte[] qualifier,
                        CompareFilter.CompareOp compareOp,
                        ByteArrayComparable comparator,
                        Delete delete,
                        boolean result)
                          throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before checkAndDelete.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preCheckAndDelete in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    compareOp - the comparison operation
    comparator - the comparator
    delete - delete to commit if check succeeds
    
    Returns:
    the value to return to client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCheckAndDeleteAfterRowLock
```
public boolean preCheckAndDeleteAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> e,
                                    byte[] row,
                                    byte[] family,
                                    byte[] qualifier,
                                    CompareFilter.CompareOp compareOp,
                                    ByteArrayComparable comparator,
                                    Delete delete,
                                    boolean result)
                                      throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before checkAndDelete but after acquiring rowock.
    Note: Caution to be taken for not doing any long time operation in this hook. Row will be locked for longer time. Trying to acquire lock on another row, within this, can lead to potential deadlock.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preCheckAndDeleteAfterRowLock in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    compareOp - the comparison operation
    comparator - the comparator
    delete - delete to commit if check succeeds
    
    Returns:
    the value to return to client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postCheckAndDelete
```
public boolean postCheckAndDelete(ObserverContext<RegionCoprocessorEnvironment> e,
                         byte[] row,
                         byte[] family,
                         byte[] qualifier,
                         CompareFilter.CompareOp compareOp,
                         ByteArrayComparable comparator,
                         Delete delete,
                         boolean result)
                           throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after checkAndDelete
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postCheckAndDelete in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    compareOp - the comparison operation
    comparator - the comparator
    delete - delete to commit if check succeeds
    result - from the CheckAndDelete
    
    Returns:
    the possibly transformed returned value to return to client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preAppend
```
public Result preAppend(ObserverContext<RegionCoprocessorEnvironment> e,
               Append append)
                 throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before Append.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preAppend in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    append - Append object
    
    Returns:
    result to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preAppendAfterRowLock
```
public Result preAppendAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> e,
                           Append append)
                             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before Append but after acquiring rowlock.
    Note: Caution to be taken for not doing any long time operation in this hook. Row will be locked for longer time. Trying to acquire lock on another row, within this, can lead to potential deadlock.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preAppendAfterRowLock in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    append - Append object
    
    Returns:
    result to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postAppend
```
public Result postAppend(ObserverContext<RegionCoprocessorEnvironment> e,
                Append append,
                Result result)
                  throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after Append
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postAppend in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    append - Append object
    result - the result returned by increment
    
    Returns:
    the result to return to the client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preIncrementColumnValue
```
public long preIncrementColumnValue(ObserverContext<RegionCoprocessorEnvironment> e,
                           byte[] row,
                           byte[] family,
                           byte[] qualifier,
                           long amount,
                           boolean writeToWAL)
                             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before incrementColumnValue
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preIncrementColumnValue in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    amount - long amount to increment
    writeToWAL - true if the change should be written to the WAL
    
    Returns:
    value to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postIncrementColumnValue
```
public long postIncrementColumnValue(ObserverContext<RegionCoprocessorEnvironment> e,
                            byte[] row,
                            byte[] family,
                            byte[] qualifier,
                            long amount,
                            boolean writeToWAL,
                            long result)
                              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after incrementColumnValue
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postIncrementColumnValue in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    amount - long amount to increment
    writeToWAL - true if the change should be written to the WAL
    result - the result returned by incrementColumnValue
    
    Returns:
    the result to return to the client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preIncrement
```
public Result preIncrement(ObserverContext<RegionCoprocessorEnvironment> e,
                  Increment increment)
                    throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before Increment.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preIncrement in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    increment - increment object
    
    Returns:
    result to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preIncrementAfterRowLock
```
public Result preIncrementAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> e,
                              Increment increment)
                                throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before Increment but after acquiring rowlock.
    Note: Caution to be taken for not doing any long time operation in this hook. Row will be locked for longer time. Trying to acquire lock on another row, within this, can lead to potential deadlock.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preIncrementAfterRowLock in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    increment - increment object
    
    Returns:
    result to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postIncrement
```
public Result postIncrement(ObserverContext<RegionCoprocessorEnvironment> e,
                   Increment increment,
                   Result result)
                     throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after increment
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postIncrement in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    increment - increment object
    result - the result returned by increment
    
    Returns:
    the result to return to the client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preScannerOpen
```
public RegionScanner preScannerOpen(ObserverContext<RegionCoprocessorEnvironment> e,
                           Scan scan,
                           RegionScanner s)
                             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client opens a new scanner.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preScannerOpen in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    scan - the Scan specification
    s - if not null, the base scanner
    
    Returns:
    an RegionScanner instance to use instead of the base scanner if overriding default behavior, null otherwise
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preStoreScannerOpen
```
public KeyValueScanner preStoreScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
                                  Store store,
                                  Scan scan,
                                  NavigableSet<byte[]> targetCols,
                                  KeyValueScanner s)
                                    throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before a store opens a new scanner. This hook is called when a "user" scanner is opened.
    See RegionObserver.preFlushScannerOpen(ObserverContext, Store, KeyValueScanner, InternalScanner) and RegionObserver.preCompactScannerOpen(ObserverContext, Store, List, ScanType, long, InternalScanner) to override scanners created for flushes or compactions, resp.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors. Calling ObserverContext.bypass() has no effect in this hook.
    
    Specified by:
    
    preStoreScannerOpen in interface RegionObserver
    
    Parameters:
    c - the environment provided by the region server
    store - the store being scanned
    scan - the Scan specification
    targetCols - columns to be used in the scanner
    s - the base scanner, if not null, from previous RegionObserver in the chain
    
    Returns:
    a KeyValueScanner instance to use or null to use the default implementation
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postScannerOpen
```
public RegionScanner postScannerOpen(ObserverContext<RegionCoprocessorEnvironment> e,
                            Scan scan,
                            RegionScanner s)
                              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client opens a new scanner.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postScannerOpen in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    scan - the Scan specification
    s - if not null, the base scanner
    
    Returns:
    the scanner instance to use
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preScannerNext
```
public boolean preScannerNext(ObserverContext<RegionCoprocessorEnvironment> e,
                     InternalScanner s,
                     List<Result> results,
                     int limit,
                     boolean hasMore)
                       throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client asks for the next row on a scanner.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preScannerNext in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    s - the scanner
    results - The result to return to the client if default processing is bypassed. Can be modified. Will not be returned if default processing is not bypassed.
    limit - the maximum number of results to return
    hasMore - the 'has more' indication
    
    Returns:
    'has more' indication that should be sent to client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postScannerNext
```
public boolean postScannerNext(ObserverContext<RegionCoprocessorEnvironment> e,
                      InternalScanner s,
                      List<Result> results,
                      int limit,
                      boolean hasMore)
                        throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client asks for the next row on a scanner.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postScannerNext in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    s - the scanner
    results - the result to return to the client, can be modified
    limit - the maximum number of results to return
    hasMore - the 'has more' indication
    
    Returns:
    'has more' indication that should be sent to client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postScannerFilterRow
```
public boolean postScannerFilterRow(ObserverContext<RegionCoprocessorEnvironment> e,
                           InternalScanner s,
                           byte[] currentRow,
                           int offset,
                           short length,
                           boolean hasMore)
                             throws IOException
```
    Description copied from interface: RegionObserver
    This will be called by the scan flow when the current scanned row is being filtered out by the filter. The filter may be filtering out the row via any of the below scenarios
    1. boolean filterRowKey(byte [] buffer, int offset, int length) returning true
    2. boolean filterRow() returning true
    3. void filterRow(List kvs) removing all the kvs from the passed List
    Specified by:
    
    postScannerFilterRow in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    s - the scanner
    currentRow - The current rowkey which got filtered out
    offset - offset to rowkey
    length - length of rowkey
    hasMore - the 'has more' indication
    
    Returns:
    whether more rows are available for the scanner or not
    
    Throws:
    
    IOException
  - preScannerClose
```
public void preScannerClose(ObserverContext<RegionCoprocessorEnvironment> e,
                   InternalScanner s)
                     throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client closes a scanner.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preScannerClose in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    s - the scanner
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postScannerClose
```
public void postScannerClose(ObserverContext<RegionCoprocessorEnvironment> e,
                    InternalScanner s)
                      throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client closes a scanner.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postScannerClose in interface RegionObserver
    
    Parameters:
    e - the environment provided by the region server
    s - the scanner
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preWALRestore
```
public void preWALRestore(ObserverContext<? extends RegionCoprocessorEnvironment> env,
                 HRegionInfo info,
                 WALKey logKey,
                 WALEdit logEdit)
                   throws IOException
```
    Implementers should override this version of the method and leave the deprecated one as-is.
    
    Specified by:
    
    preWALRestore in interface RegionObserver
    
    Throws:
    
    IOException
  - preWALRestore
```
public void preWALRestore(ObserverContext<RegionCoprocessorEnvironment> env,
                 HRegionInfo info,
                 HLogKey logKey,
                 WALEdit logEdit)
                   throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before a WALEdit replayed for this region. This method is left in place to maintain binary compatibility with older RegionObservers. If an implementation directly overrides RegionObserver.preWALRestore(ObserverContext, HRegionInfo, WALKey, WALEdit) then this version won't be called at all, barring problems with the Security Manager. To work correctly in the presence of a strict Security Manager, or in the case of an implementation that relies on a parent class to implement preWALRestore, you should implement this method as a call to the non-deprecated version. Users of this method will see all edits that can be treated as HLogKey. If there are edits that can't be treated as HLogKey they won't be offered to coprocessors that rely on this method. If a coprocessor gets skipped because of this mechanism, a log message at ERROR will be generated per coprocessor on the logger for CoprocessorHost once per classloader.
    
    Specified by:
    
    preWALRestore in interface RegionObserver
    
    Throws:
    
    IOException
  - postWALRestore
```
public void postWALRestore(ObserverContext<? extends RegionCoprocessorEnvironment> env,
                  HRegionInfo info,
                  WALKey logKey,
                  WALEdit logEdit)
                    throws IOException
```
    Implementers should override this version of the method and leave the deprecated one as-is.
    
    Specified by:
    
    postWALRestore in interface RegionObserver
    
    Throws:
    
    IOException
  - postWALRestore
```
public void postWALRestore(ObserverContext<RegionCoprocessorEnvironment> env,
                  HRegionInfo info,
                  HLogKey logKey,
                  WALEdit logEdit)
                    throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after a WALEdit replayed for this region. This method is left in place to maintain binary compatibility with older RegionObservers. If an implementation directly overrides RegionObserver.postWALRestore(ObserverContext, HRegionInfo, WALKey, WALEdit) then this version won't be called at all, barring problems with the Security Manager. To work correctly in the presence of a strict Security Manager, or in the case of an implementation that relies on a parent class to implement preWALRestore, you should implement this method as a call to the non-deprecated version. Users of this method will see all edits that can be treated as HLogKey. If there are edits that can't be treated as HLogKey they won't be offered to coprocessors that rely on this method. If a coprocessor gets skipped because of this mechanism, a log message at ERROR will be generated per coprocessor on the logger for CoprocessorHost once per classloader.
    
    Specified by:
    
    postWALRestore in interface RegionObserver
    
    Throws:
    
    IOException
  - preBulkLoadHFile
```
public void preBulkLoadHFile(ObserverContext<RegionCoprocessorEnvironment> ctx,
                    List<Pair<byte[],String>> familyPaths)
                      throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before bulkLoadHFile. Users can create a StoreFile instance to access the contents of a HFile.
    
    Specified by:
    
    preBulkLoadHFile in interface RegionObserver
    
    familyPaths - pairs of { CF, HFile path } submitted for bulk load. Adding or removing from this list will add or remove HFiles to be bulk loaded.
    
    Throws:
    
    IOException
  - postBulkLoadHFile
```
public boolean postBulkLoadHFile(ObserverContext<RegionCoprocessorEnvironment> ctx,
                        List<Pair<byte[],String>> familyPaths,
                        boolean hasLoaded)
                          throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after bulkLoadHFile.
    
    Specified by:
    
    postBulkLoadHFile in interface RegionObserver
    
    familyPaths - pairs of { CF, HFile path } submitted for bulk load
    hasLoaded - whether the bulkLoad was successful
    
    Returns:
    the new value of hasLoaded
    
    Throws:
    
    IOException
  - preStoreFileReaderOpen
```
public StoreFile.Reader preStoreFileReaderOpen(ObserverContext<RegionCoprocessorEnvironment> ctx,
                                      org.apache.hadoop.fs.FileSystem fs,
                                      org.apache.hadoop.fs.Path p,
                                      FSDataInputStreamWrapper in,
                                      long size,
                                      CacheConfig cacheConf,
                                      Reference r,
                                      StoreFile.Reader reader)
                                        throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before creation of Reader for a store file. Calling ObserverContext.bypass() has no effect in this hook.
    
    Specified by:
    
    preStoreFileReaderOpen in interface RegionObserver
    
    Parameters:
    ctx - the environment provided by the region server
    fs - fileystem to read from
    p - path to the file
    in - FSDataInputStreamWrapper
    size - Full size of the file
    r - original reference file. This will be not null only when reading a split file.
    reader - the base reader, if not null, from previous RegionObserver in the chain
    
    Returns:
    a Reader instance to use instead of the base reader if overriding default behavior, null otherwise
    
    Throws:
    
    IOException
  - postStoreFileReaderOpen
```
public StoreFile.Reader postStoreFileReaderOpen(ObserverContext<RegionCoprocessorEnvironment> ctx,
                                       org.apache.hadoop.fs.FileSystem fs,
                                       org.apache.hadoop.fs.Path p,
                                       FSDataInputStreamWrapper in,
                                       long size,
                                       CacheConfig cacheConf,
                                       Reference r,
                                       StoreFile.Reader reader)
                                         throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the creation of Reader for a store file.
    
    Specified by:
    
    postStoreFileReaderOpen in interface RegionObserver
    
    Parameters:
    ctx - the environment provided by the region server
    fs - fileystem to read from
    p - path to the file
    in - FSDataInputStreamWrapper
    size - Full size of the file
    r - original reference file. This will be not null only when reading a split file.
    reader - the base reader instance
    
    Returns:
    The reader to use
    
    Throws:
    
    IOException
  - postMutationBeforeWAL
```
public Cell postMutationBeforeWAL(ObserverContext<RegionCoprocessorEnvironment> ctx,
                         RegionObserver.MutationType opType,
                         Mutation mutation,
                         Cell oldCell,
                         Cell newCell)
                           throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after a new cell has been created during an increment operation, but before it is committed to the WAL or memstore. Calling ObserverContext.bypass() has no effect in this hook.
    
    Specified by:
    
    postMutationBeforeWAL in interface RegionObserver
    
    Parameters:
    ctx - the environment provided by the region server
    opType - the operation type
    mutation - the current mutation
    oldCell - old cell containing previous value
    newCell - the new cell containing the computed value
    
    Returns:
    the new cell, possibly changed
    
    Throws:
    
    IOException
  - postStartRegionOperation
```
public void postStartRegionOperation(ObserverContext<RegionCoprocessorEnvironment> ctx,
                            Region.Operation op)
                              throws IOException
```
    Description copied from interface: RegionObserver
    
    This will be called for region operations where read lock is acquired in Region.startRegionOperation().
    
    Specified by:
    
    postStartRegionOperation in interface RegionObserver
    
    op - The operation is about to be taken on the region
    
    Throws:
    
    IOException
  - postCloseRegionOperation
```
public void postCloseRegionOperation(ObserverContext<RegionCoprocessorEnvironment> ctx,
                            Region.Operation op)
                              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after releasing read lock in Region.closeRegionOperation().
    
    Specified by:
    
    postCloseRegionOperation in interface RegionObserver
    
    Throws:
    
    IOException
  - postInstantiateDeleteTracker
```
public DeleteTracker postInstantiateDeleteTracker(ObserverContext<RegionCoprocessorEnvironment> ctx,
                                         DeleteTracker delTracker)
                                           throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the ScanQueryMatcher creates ScanDeleteTracker. Implementing this hook would help in creating customised DeleteTracker and returning the newly created DeleteTracker
    
    Specified by:
    
    postInstantiateDeleteTracker in interface RegionObserver
    
    Parameters:
    ctx - the environment provided by the region server
    delTracker - the deleteTracker that is created by the QueryMatcher
    
    Returns:
    the Delete Tracker
    
    Throws:
    
    IOException

Class BaseRegionObserver

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.coprocessor.RegionObserver

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.Coprocessor

Field Summary

Fields inherited from interface org.apache.hadoop.hbase.Coprocessor

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

BaseRegionObserver

Method Detail

start

stop

preOpen

postOpen

postLogReplay

preClose

postClose

preFlushScannerOpen

preFlush

postFlush

preFlush

postFlush

preSplit

preSplit

preSplitBeforePONR

preSplitAfterPONR

preRollBackSplit

postRollBackSplit

postCompleteSplit

postSplit

preCompactSelection

preCompactSelection

postCompactSelection

postCompactSelection

preCompact

preCompact

preCompactScannerOpen

preCompactScannerOpen

postCompact

postCompact

preGetClosestRowBefore

postGetClosestRowBefore

preGetOp

postGetOp

preExists

postExists

prePut

postPut

preDelete

prePrepareTimeStampForDeleteVersion

postDelete

preBatchMutate

postBatchMutate

postBatchMutateIndispensably

preCheckAndPut

preCheckAndPutAfterRowLock

postCheckAndPut

preCheckAndDelete

preCheckAndDeleteAfterRowLock

postCheckAndDelete

preAppend

preAppendAfterRowLock

postAppend

preIncrementColumnValue

postIncrementColumnValue

preIncrement

preIncrementAfterRowLock

postIncrement

preScannerOpen

preStoreScannerOpen

postScannerOpen

preScannerNext

postScannerNext

postScannerFilterRow

preScannerClose

postScannerClose

preWALRestore

preWALRestore