StripeStoreFileManager (Apache HBase 1.1.7 API)

java.lang.Object
- org.apache.hadoop.hbase.regionserver.StripeStoreFileManager

All Implemented Interfaces:

StripeCompactionPolicy.StripeInformationProvider, StoreFileManager
```
@InterfaceAudience.Private
public class StripeStoreFileManager
extends Object
implements StoreFileManager, StripeCompactionPolicy.StripeInformationProvider
```
Stripe implementation of StoreFileManager. Not thread safe - relies on external locking (in HStore). Collections that this class returns are immutable or unique to the call, so they should be safe. Stripe store splits the key space of the region into non-overlapping stripes, as well as some recent files that have all the keys (level 0). Each stripe contains a set of files. When L0 is compacted, it's split into the files corresponding to existing stripe boundaries, that can thus be added to stripes. When scan or get happens, it only has to read the files from the corresponding stripes. See StripeCompationPolicy on how the stripes are determined; this class doesn't care. This class should work together with StripeCompactionPolicy and StripeCompactor. With regard to how they work, we make at least the following (reasonable) assumptions: - Compaction produces one file per new stripe (if any); that is easy to change. - Compaction has one contiguous set of stripes both in and out, except if L0 is involved.

Field Summary

Fields
Modifier and Type	Field and Description
`static byte[]`	`OPEN_KEY` The key value used for range boundary, indicating that the boundary is open (i.e.
`static byte[]`	`STRIPE_END_KEY`
`static byte[]`	`STRIPE_START_KEY` The file metadata fields that contain the stripe information.

Constructor Summary

Constructors
Constructor and Description
`StripeStoreFileManager(KeyValue.KVComparator kvComparator, org.apache.hadoop.conf.Configuration conf, StripeStoreConfig config)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addCompactionResults(Collection<StoreFile> compactedFiles, Collection<StoreFile> results)` Adds compaction results into the structure.
`com.google.common.collect.ImmutableCollection<StoreFile>`	`clearFiles()` Clears all the files currently in use and returns them.
`Iterator<StoreFile>`	`getCandidateFilesForRowKeyBefore(KeyValue targetKey)` See `StoreFileManager.getCandidateFilesForRowKeyBefore(KeyValue)` for details on this methods.
`double`	`getCompactionPressure()`
`byte[]`	`getEndRow(int stripeIndex)` Gets the end row for a given stripe.
`Collection<StoreFile>`	`getFilesForScanOrGet(boolean isGet, byte[] startRow, byte[] stopRow)` Gets the store files to scan for a Scan or Get request.
`List<StoreFile>`	`getLevel0Files()`
`byte[]`	`getSplitPoint()` Gets the split point for the split of this set of store files (approx.
`byte[]`	`getStartRow(int stripeIndex)` Gets the start row for a given stripe.
`int`	`getStoreCompactionPriority()`
`int`	`getStorefileCount()` Returns the number of files currently in use.
`Collection<StoreFile>`	`getStorefiles()` Gets the snapshot of the store files currently in use.
`List<byte[]>`	`getStripeBoundaries()`
`int`	`getStripeCount()`
`ArrayList<com.google.common.collect.ImmutableList<StoreFile>>`	`getStripes()`
`Collection<StoreFile>`	`getUnneededFiles(long maxTs, List<StoreFile> filesCompacting)`
`void`	`insertNewFiles(Collection<StoreFile> sfs)` Adds new files, either for from MemStore flush or bulk insert, into the structure.
`void`	`loadFiles(List<StoreFile> storeFiles)` Loads the initial store files into empty StoreFileManager.
`Iterator<StoreFile>`	`updateCandidateFilesForRowKeyBefore(Iterator<StoreFile> candidateFiles, KeyValue targetKey, Cell candidate)` See `StoreFileManager.getCandidateFilesForRowKeyBefore(KeyValue)` and `StoreFileManager.updateCandidateFilesForRowKeyBefore(Iterator, KeyValue, Cell)` for details on this methods.

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

- Field Detail
  - STRIPE_START_KEY
```
public static final byte[] STRIPE_START_KEY
```
    The file metadata fields that contain the stripe information.
  - STRIPE_END_KEY
```
public static final byte[] STRIPE_END_KEY
```
  - OPEN_KEY
```
public static final byte[] OPEN_KEY
```
    The key value used for range boundary, indicating that the boundary is open (i.e. +-inf).
- Constructor Detail
  - StripeStoreFileManager
```
public StripeStoreFileManager(KeyValue.KVComparator kvComparator,
                      org.apache.hadoop.conf.Configuration conf,
                      StripeStoreConfig config)
```
- Method Detail
  - loadFiles
```
public void loadFiles(List<StoreFile> storeFiles)
```
    Description copied from interface: StoreFileManager
    
    Loads the initial store files into empty StoreFileManager.
    
    Specified by:
    
    loadFiles in interface StoreFileManager
    
    Parameters:
    storeFiles - The files to load.
  - getStorefiles
```
public Collection<StoreFile> getStorefiles()
```
    Description copied from interface: StoreFileManager
    
    Gets the snapshot of the store files currently in use. Can be used for things like metrics and checks; should not assume anything about relations between store files in the list.
    
    Specified by:
    
    getStorefiles in interface StripeCompactionPolicy.StripeInformationProvider
    
    Specified by:
    
    getStorefiles in interface StoreFileManager
    
    Returns:
    The list of StoreFiles.
  - insertNewFiles
```
public void insertNewFiles(Collection<StoreFile> sfs)
                    throws IOException
```
    Description copied from interface: StoreFileManager
    
    Adds new files, either for from MemStore flush or bulk insert, into the structure.
    
    Specified by:
    
    insertNewFiles in interface StoreFileManager
    
    Parameters:
    sfs - New store files.
    
    Throws:
    
    IOException
  - clearFiles
```
public com.google.common.collect.ImmutableCollection<StoreFile> clearFiles()
```
    Description copied from interface: StoreFileManager
    
    Clears all the files currently in use and returns them.
    
    Specified by:
    
    clearFiles in interface StoreFileManager
    
    Returns:
    The files previously in use.
  - getStorefileCount
```
public int getStorefileCount()
```
    Description copied from interface: StoreFileManager
    
    Returns the number of files currently in use.
    
    Specified by:
    
    getStorefileCount in interface StoreFileManager
    
    Returns:
    The number of files.
  - getCandidateFilesForRowKeyBefore
```
public Iterator<StoreFile> getCandidateFilesForRowKeyBefore(KeyValue targetKey)
```
    See StoreFileManager.getCandidateFilesForRowKeyBefore(KeyValue) for details on this methods.
    
    Specified by:
    
    getCandidateFilesForRowKeyBefore in interface StoreFileManager
    
    Parameters:
    targetKey - The key that is the basis of the search.
    
    Returns:
    The files that may have the key less than or equal to targetKey, in reverse order of new-ness, and preference for target key.
  - updateCandidateFilesForRowKeyBefore
```
public Iterator<StoreFile> updateCandidateFilesForRowKeyBefore(Iterator<StoreFile> candidateFiles,
                                                      KeyValue targetKey,
                                                      Cell candidate)
```
    See StoreFileManager.getCandidateFilesForRowKeyBefore(KeyValue) and StoreFileManager.updateCandidateFilesForRowKeyBefore(Iterator, KeyValue, Cell) for details on this methods.
    
    Specified by:
    
    updateCandidateFilesForRowKeyBefore in interface StoreFileManager
    
    Parameters:
    candidateFiles - The candidate files not yet checked for better candidates - return value from StoreFileManager.getCandidateFilesForRowKeyBefore(KeyValue), with some files already removed.
    targetKey - The key to search for.
    candidate - The current best candidate found.
    
    Returns:
    The list to replace candidateFiles.
  - getSplitPoint
```
public byte[] getSplitPoint()
                     throws IOException
```
    Description copied from interface: StoreFileManager
    
    Gets the split point for the split of this set of store files (approx. middle).
    
    Specified by:
    
    getSplitPoint in interface StoreFileManager
    
    Returns:
    The mid-point, or null if no split is possible.
    
    Throws:
    
    IOException
  - getFilesForScanOrGet
```
public Collection<StoreFile> getFilesForScanOrGet(boolean isGet,
                                         byte[] startRow,
                                         byte[] stopRow)
```
    Description copied from interface: StoreFileManager
    
    Gets the store files to scan for a Scan or Get request.
    
    Specified by:
    
    getFilesForScanOrGet in interface StoreFileManager
    
    Parameters:
    isGet - Whether it's a get.
    startRow - Start row of the request.
    stopRow - Stop row of the request.
    
    Returns:
    The list of files that are to be read for this request.
  - addCompactionResults
```
public void addCompactionResults(Collection<StoreFile> compactedFiles,
                        Collection<StoreFile> results)
                          throws IOException
```
    Description copied from interface: StoreFileManager
    
    Adds compaction results into the structure.
    
    Specified by:
    
    addCompactionResults in interface StoreFileManager
    
    Parameters:
    compactedFiles - The input files for the compaction.
    results - The resulting files for the compaction.
    
    Throws:
    
    IOException
  - getStoreCompactionPriority
```
public int getStoreCompactionPriority()
```
    Specified by:
    
    getStoreCompactionPriority in interface StoreFileManager
    
    Returns:
    The store compaction priority.
  - getStartRow
```
public final byte[] getStartRow(int stripeIndex)
```
    Description copied from interface: StripeCompactionPolicy.StripeInformationProvider
    
    Gets the start row for a given stripe.
    
    Specified by:
    
    getStartRow in interface StripeCompactionPolicy.StripeInformationProvider
    
    Parameters:
    stripeIndex - Stripe index.
    
    Returns:
    Start row. May be an open key.
  - getEndRow
```
public final byte[] getEndRow(int stripeIndex)
```
    Description copied from interface: StripeCompactionPolicy.StripeInformationProvider
    
    Gets the end row for a given stripe.
    
    Specified by:
    
    getEndRow in interface StripeCompactionPolicy.StripeInformationProvider
    
    Parameters:
    stripeIndex - Stripe index.
    
    Returns:
    End row. May be an open key.
  - getLevel0Files
```
public List<StoreFile> getLevel0Files()
```
    Specified by:
    
    getLevel0Files in interface StripeCompactionPolicy.StripeInformationProvider
    
    Returns:
    Level 0 files.
  - getStripeBoundaries
```
public List<byte[]> getStripeBoundaries()
```
    Specified by:
    
    getStripeBoundaries in interface StripeCompactionPolicy.StripeInformationProvider
    
    Returns:
    All stripe boundaries; including the open ones on both ends.
  - getStripes
```
public ArrayList<com.google.common.collect.ImmutableList<StoreFile>> getStripes()
```
    Specified by:
    
    getStripes in interface StripeCompactionPolicy.StripeInformationProvider
    
    Returns:
    The stripes.
  - getStripeCount
```
public int getStripeCount()
```
    Specified by:
    
    getStripeCount in interface StripeCompactionPolicy.StripeInformationProvider
    
    Returns:
    Stripe count.
  - getUnneededFiles
```
public Collection<StoreFile> getUnneededFiles(long maxTs,
                                     List<StoreFile> filesCompacting)
```
    Specified by:
    
    getUnneededFiles in interface StoreFileManager
    
    Parameters:
    maxTs - Maximum expired timestamp.
    filesCompacting - Files that are currently compacting.
    
    Returns:
    The files which don't have any necessary data according to TTL and other criteria.
  - getCompactionPressure
```
public double getCompactionPressure()
```
    Specified by:
    
    getCompactionPressure in interface StoreFileManager
    
    Returns:
    the compaction pressure used for compaction throughput tuning.
    See Also:
    Store.getCompactionPressure()

Class StripeStoreFileManager

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

STRIPE_START_KEY

STRIPE_END_KEY

OPEN_KEY

Constructor Detail

StripeStoreFileManager

Method Detail

loadFiles

getStorefiles

insertNewFiles

clearFiles

getStorefileCount

getCandidateFilesForRowKeyBefore

updateCandidateFilesForRowKeyBefore

getSplitPoint

getFilesForScanOrGet

addCompactionResults

getStoreCompactionPriority

getStartRow

getEndRow

getLevel0Files

getStripeBoundaries

getStripes

getStripeCount

getUnneededFiles

getCompactionPressure