org.apache.hadoop.hbase.wal

Class DisabledWALProvider.DisabledWAL

java.lang.Object

org.apache.hadoop.hbase.wal.DisabledWALProvider.DisabledWAL

All Implemented Interfaces:

Closeable, AutoCloseable, WALFileLengthProvider, WAL

Enclosing class:

DisabledWALProvider

private static class DisabledWALProvider.DisabledWAL
extends Object
implements WAL

Nested Class Summary

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

WAL.Entry, WAL.Reader

Field Summary

Fields

Modifier and Type	Field and Description
protected AtomicBoolean	closed
protected WALCoprocessorHost	coprocessorHost
protected List<WALActionsListener>	listeners
protected org.apache.hadoop.fs.Path	path

Constructor Summary

Constructors

Constructor and Description
DisabledWAL(org.apache.hadoop.fs.Path path, org.apache.hadoop.conf.Configuration conf, List<WALActionsListener> listeners)

Method Summary

Modifier and Type	Method and Description
void	abortCacheFlush(byte[] encodedRegionName) Abort a cache flush.
long	append(RegionInfo info, WALKeyImpl key, WALEdit edits, boolean inMemstore) Append a set of edits to the WAL.
void	close() Caller no longer needs any edits from this WAL.
void	completeCacheFlush(byte[] encodedRegionName) Complete the cache flush.
WALCoprocessorHost	getCoprocessorHost()
long	getEarliestMemStoreSeqNum(byte[] encodedRegionName) Gets the earliest unflushed sequence id in the memstore for the region.
long	getEarliestMemStoreSeqNum(byte[] encodedRegionName, byte[] familyName) Gets the earliest unflushed sequence id in the memstore for the store.
OptionalLong	getLogFileSizeIfBeingWritten(org.apache.hadoop.fs.Path path)
void	registerWALActionsListener(WALActionsListener listener) Registers WALActionsListener
byte[][]	rollWriter() Roll the log writer.
byte[][]	rollWriter(boolean force) Roll the log writer.
void	shutdown() Stop accepting new writes.
Long	startCacheFlush(byte[] encodedRegionName, Map<byte[],Long> flushedFamilyNamesToSeq)
Long	startCacheFlush(byte[] encodedRegionName, Set<byte[]> flushedFamilyNames) WAL keeps track of the sequence numbers that are as yet not flushed im memstores in order to be able to do accounting to figure which WALs can be let go.
void	sync() Sync what we have in the WAL.
void	sync(long txid) Sync the WAL if the txId was not already sync'd.
String	toString() Human readable identifying information about the state of this WAL.
boolean	unregisterWALActionsListener(WALActionsListener listener) Unregisters WALActionsListener
void	updateStore(byte[] encodedRegionName, byte[] familyName, Long sequenceid, boolean onlyIfGreater) updates the seuence number of a specific store.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

listeners

protected final List<WALActionsListener> listeners

path

protected final org.apache.hadoop.fs.Path path

coprocessorHost

protected final WALCoprocessorHost coprocessorHost

closed

protected final AtomicBoolean closed

Constructor Detail

DisabledWAL

public DisabledWAL(org.apache.hadoop.fs.Path path,
                   org.apache.hadoop.conf.Configuration conf,
                   List<WALActionsListener> listeners)

Method Detail

registerWALActionsListener

public void registerWALActionsListener(WALActionsListener listener)

Description copied from interface: WAL

Registers WALActionsListener

Specified by:

registerWALActionsListener in interface WAL

unregisterWALActionsListener

public boolean unregisterWALActionsListener(WALActionsListener listener)

Description copied from interface: WAL

Unregisters WALActionsListener

Specified by:

unregisterWALActionsListener in interface WAL

rollWriter

public byte[][] rollWriter()

Description copied from interface: WAL

Roll the log writer. That is, start writing log messages to a new file.

The implementation is synchronized in order to make sure there's one rollWriter running at any given time.

Specified by:

rollWriter in interface WAL

Returns:

If lots of logs, flush the returned regions so next time through we can clean logs. Returns null if nothing to flush. Names are actual region names as returned by RegionInfo.getEncodedName()

rollWriter

public byte[][] rollWriter(boolean force)

Description copied from interface: WAL

Roll the log writer. That is, start writing log messages to a new file.

The implementation is synchronized in order to make sure there's one rollWriter running at any given time.

Specified by:

rollWriter in interface WAL

Parameters:

force - If true, force creation of a new writer even if no entries have been written to the current writer

Returns:

If lots of logs, flush the returned regions so next time through we can clean logs. Returns null if nothing to flush. Names are actual region names as returned by RegionInfo.getEncodedName()

shutdown

public void shutdown()

Description copied from interface: WAL

Stop accepting new writes. If we have unsynced writes still in buffer, sync them. Extant edits are left in place in backing storage to be replayed later.

Specified by:

shutdown in interface WAL

close

public void close()

Description copied from interface: WAL

Caller no longer needs any edits from this WAL. Implementers are free to reclaim underlying resources after this call; i.e. filesystem based WALs can archive or delete files.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface WAL

append

public long append(RegionInfo info,
                   WALKeyImpl key,
                   WALEdit edits,
                   boolean inMemstore)
            throws IOException

Description copied from interface: WAL

Append a set of edits to the WAL. The WAL is not flushed/sync'd after this transaction completes BUT on return this edit must have its region edit/sequence id assigned else it messes up our unification of mvcc and sequenceid. On return key will have the region edit/sequence id filled in.

Specified by:

append in interface WAL

Parameters:

info - the regioninfo associated with append

key - Modified by this call; we add to it this edits region edit/sequence id.

edits - Edits to append. MAY CONTAIN NO EDITS for case where we want to get an edit sequence id that is after all currently appended edits.

inMemstore - Always true except for case where we are writing a compaction completion record into the WAL; in this case the entry is just so we can finish an unfinished compaction -- it is not an edit for memstore.

Returns:

Returns a 'transaction id' and key will have the region edit/sequence id in it.

Throws:

IOException

updateStore

public void updateStore(byte[] encodedRegionName,
                        byte[] familyName,
                        Long sequenceid,
                        boolean onlyIfGreater)

Description copied from interface: WAL

updates the seuence number of a specific store. depending on the flag: replaces current seq number if the given seq id is bigger, or even if it is lower than existing one

Specified by:

updateStore in interface WAL

sync

public void sync()

Description copied from interface: WAL

Sync what we have in the WAL.

Specified by:

sync in interface WAL

sync

public void sync(long txid)

Description copied from interface: WAL

Sync the WAL if the txId was not already sync'd.

Specified by:

sync in interface WAL

Parameters:

txid - Transaction id to sync to.

startCacheFlush

public Long startCacheFlush(byte[] encodedRegionName,
                            Map<byte[],Long> flushedFamilyNamesToSeq)

Specified by:

startCacheFlush in interface WAL

startCacheFlush

public Long startCacheFlush(byte[] encodedRegionName,
                            Set<byte[]> flushedFamilyNames)

Description copied from interface: WAL

WAL keeps track of the sequence numbers that are as yet not flushed im memstores in order to be able to do accounting to figure which WALs can be let go. This method tells WAL that some region is about to flush. The flush can be the whole region or for a column family of the region only.

Currently, it is expected that the update lock is held for the region; i.e. no concurrent appends while we set up cache flush.

Specified by:

startCacheFlush in interface WAL

flushedFamilyNames - Families to flush. May be a subset of all families in the region.

Returns:

Returns HConstants.NO_SEQNUM if we are flushing the whole region OR if we are flushing a subset of all families but there are no edits in those families not being flushed; in other words, this is effectively same as a flush of all of the region though we were passed a subset of regions. Otherwise, it returns the sequence id of the oldest/lowest outstanding edit.

See Also:

WAL.completeCacheFlush(byte[]), WAL.abortCacheFlush(byte[])

completeCacheFlush

public void completeCacheFlush(byte[] encodedRegionName)

Description copied from interface: WAL

Complete the cache flush.

Specified by:

completeCacheFlush in interface WAL

Parameters:

encodedRegionName - Encoded region name.

See Also:

WAL.startCacheFlush(byte[], Set), WAL.abortCacheFlush(byte[])

abortCacheFlush

public void abortCacheFlush(byte[] encodedRegionName)

Description copied from interface: WAL

Abort a cache flush. Call if the flush fails. Note that the only recovery for an aborted flush currently is a restart of the regionserver so the snapshot content dropped by the failure gets restored to the memstore.

Specified by:

abortCacheFlush in interface WAL

Parameters:

encodedRegionName - Encoded region name.

getCoprocessorHost

public WALCoprocessorHost getCoprocessorHost()

Specified by:

getCoprocessorHost in interface WAL

Returns:

Coprocessor host.

getEarliestMemStoreSeqNum

public long getEarliestMemStoreSeqNum(byte[] encodedRegionName)

Description copied from interface: WAL

Gets the earliest unflushed sequence id in the memstore for the region.

Specified by:

getEarliestMemStoreSeqNum in interface WAL

Parameters:

encodedRegionName - The region to get the number for.

Returns:

The earliest/lowest/oldest sequence id if present, HConstants.NO_SEQNUM if absent.

getEarliestMemStoreSeqNum

public long getEarliestMemStoreSeqNum(byte[] encodedRegionName,
                                      byte[] familyName)

Description copied from interface: WAL

Gets the earliest unflushed sequence id in the memstore for the store.

Specified by:

getEarliestMemStoreSeqNum in interface WAL

Parameters:

encodedRegionName - The region to get the number for.

familyName - The family to get the number for.

Returns:

The earliest/lowest/oldest sequence id if present, HConstants.NO_SEQNUM if absent.

toString

public String toString()

Description copied from interface: WAL

Human readable identifying information about the state of this WAL. Implementors are encouraged to include information appropriate for debugging. Consumers are advised not to rely on the details of the returned String; it does not have a defined structure.

Specified by:

toString in interface WAL

Overrides:

toString in class Object

getLogFileSizeIfBeingWritten

public OptionalLong getLogFileSizeIfBeingWritten(org.apache.hadoop.fs.Path path)

Specified by:

getLogFileSizeIfBeingWritten in interface WALFileLengthProvider