org.apache.hadoop.hbase.regionserver.compactions

Class Compactor

java.lang.Object

org.apache.hadoop.hbase.regionserver.compactions.Compactor

Direct Known Subclasses:

DefaultCompactor, StripeCompactor

@InterfaceAudience.Private
public abstract class Compactor
extends Object

A compactor is a compaction algorithm associated a given policy. Base class also contains reusable parts for implementing compactors (what is common and what isn't is evolving).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Compactor.CellSink TODO: Replace this with CellOutputStream when StoreFile.Writer uses cells.
protected static class	Compactor.FileDetails The sole reason this class exists is that java has no ref/out/pointer parameters.

Field Summary

Fields

Modifier and Type	Field and Description
protected Compression.Algorithm	compactionCompression
protected org.apache.hadoop.conf.Configuration	conf
protected CompactionProgress	progress
protected Store	store

Method Summary

Methods

Modifier and Type	Method and Description
protected List<StoreFileScanner>	createFileScanners(Collection<StoreFile> filesToCompact, long smallestReadPoint) Creates file scanners for compaction.
protected InternalScanner	createScanner(Store store, List<StoreFileScanner> scanners, long smallestReadPoint, long earliestPutTs, byte[] dropDeletesFromRow, byte[] dropDeletesToRow)
protected InternalScanner	createScanner(Store store, List<StoreFileScanner> scanners, ScanType scanType, long smallestReadPoint, long earliestPutTs)
protected Compactor.FileDetails	getFileDetails(Collection<StoreFile> filesToCompact, boolean calculatePutTs) Extracts some details about the files to compact that are commonly needed by compactors.
CompactionProgress	getProgress()
protected long	getSmallestReadPoint()
protected boolean	performCompaction(InternalScanner scanner, Compactor.CellSink writer, long smallestReadPoint) Performs the compaction.
protected InternalScanner	postCreateCoprocScanner(CompactionRequest request, ScanType scanType, InternalScanner scanner) Calls coprocessor, if any, to create scanners - after normal scanner creation.
protected InternalScanner	preCreateCoprocScanner(CompactionRequest request, ScanType scanType, long earliestPutTs, List<StoreFileScanner> scanners) Calls coprocessor, if any, to create compaction scanner - before normal scanner creation.

Methods inherited from class java.lang.Object

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

Field Detail

progress

protected CompactionProgress progress

conf

protected org.apache.hadoop.conf.Configuration conf

store

protected Store store

compactionCompression

protected Compression.Algorithm compactionCompression

Method Detail

getProgress

public CompactionProgress getProgress()

getFileDetails

protected Compactor.FileDetails getFileDetails(Collection<StoreFile> filesToCompact,
                                   boolean calculatePutTs)
                                        throws IOException

Extracts some details about the files to compact that are commonly needed by compactors.

Parameters:

filesToCompact - Files.

calculatePutTs - Whether earliest put TS is needed.

Returns:

The result.

Throws:

IOException

createFileScanners

protected List<StoreFileScanner> createFileScanners(Collection<StoreFile> filesToCompact,
                                        long smallestReadPoint)
                                             throws IOException

Creates file scanners for compaction.

Parameters:

filesToCompact - Files.

Returns:

Scanners.

Throws:

IOException

getSmallestReadPoint

protected long getSmallestReadPoint()

preCreateCoprocScanner

protected InternalScanner preCreateCoprocScanner(CompactionRequest request,
                                     ScanType scanType,
                                     long earliestPutTs,
                                     List<StoreFileScanner> scanners)
                                          throws IOException

Calls coprocessor, if any, to create compaction scanner - before normal scanner creation.

Parameters:

request - Compaction request.

scanType - Scan type.

earliestPutTs - Earliest put ts.

scanners - File scanners for compaction files.

Returns:

Scanner override by coprocessor; null if not overriding.

Throws:

IOException

postCreateCoprocScanner

protected InternalScanner postCreateCoprocScanner(CompactionRequest request,
                                      ScanType scanType,
                                      InternalScanner scanner)
                                           throws IOException

Calls coprocessor, if any, to create scanners - after normal scanner creation.

Parameters:

request - Compaction request.

scanType - Scan type.

scanner - The default scanner created for compaction.

Returns:

Scanner scanner to use (usually the default); null if compaction should not proceed.

Throws:

IOException

performCompaction

protected boolean performCompaction(InternalScanner scanner,
                        Compactor.CellSink writer,
                        long smallestReadPoint)
                             throws IOException

Performs the compaction.

Parameters:

scanner - Where to read from.

writer - Where to write to.

smallestReadPoint - Smallest read point.

Returns:

Whether compaction ended; false if it was interrupted for some reason.

Throws:

IOException

createScanner

protected InternalScanner createScanner(Store store,
                            List<StoreFileScanner> scanners,
                            ScanType scanType,
                            long smallestReadPoint,
                            long earliestPutTs)
                                 throws IOException

Parameters:

store - store

scanners - Store file scanners.

scanType - Scan type.

smallestReadPoint - Smallest MVCC read point.

earliestPutTs - Earliest put across all files.

Returns:

A compaction scanner.

Throws:

IOException

createScanner

protected InternalScanner createScanner(Store store,
                            List<StoreFileScanner> scanners,
                            long smallestReadPoint,
                            long earliestPutTs,
                            byte[] dropDeletesFromRow,
                            byte[] dropDeletesToRow)
                                 throws IOException

Parameters:

store - The store.

scanners - Store file scanners.

smallestReadPoint - Smallest MVCC read point.

earliestPutTs - Earliest put across all files.

dropDeletesFromRow - Drop deletes starting with this row, inclusive. Can be null.

dropDeletesToRow - Drop deletes ending with this row, exclusive. Can be null.

Returns:

A compaction scanner.

Throws:

IOException