/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.regionserver.compactions;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.io.compress.Compression;
import org.apache.hadoop.hbase.regionserver.InternalScanner;
import org.apache.hadoop.hbase.regionserver.ScanType;
import org.apache.hadoop.hbase.regionserver.Store;
import org.apache.hadoop.hbase.regionserver.StoreFile;
import org.apache.hadoop.hbase.regionserver.StoreFileScanner;
import org.apache.hadoop.hbase.regionserver.StoreScanner;
import org.apache.hadoop.hbase.regionserver.StripeMultiFileWriter;
import org.apache.hadoop.hbase.regionserver.StoreFile.Writer;
import org.apache.hadoop.hbase.util.Bytes;
/**
* This is the placeholder for stripe compactor. The implementation,
* as well as the proper javadoc, will be added in HBASE-7967.
*/
@InterfaceAudience.Private
public class StripeCompactor extends Compactor {
private static final Log LOG = LogFactory.getLog(StripeCompactor.class);
public StripeCompactor(Configuration conf, Store store) {
super(conf, store);
}
public List<Path> compact(CompactionRequest request, List<byte[]> targetBoundaries,
byte[] majorRangeFromRow, byte[] majorRangeToRow) throws IOException {
if (LOG.isDebugEnabled()) {
StringBuilder sb = new StringBuilder();
sb.append("Executing compaction with " + targetBoundaries.size() + " boundaries:");
for (byte[] tb : targetBoundaries) {
sb.append(" [").append(Bytes.toString(tb)).append("]");
}
LOG.debug(sb.toString());
}
StripeMultiFileWriter writer = new StripeMultiFileWriter.BoundaryMultiWriter(
targetBoundaries, majorRangeFromRow, majorRangeToRow);
return compactInternal(writer, request, majorRangeFromRow, majorRangeToRow);
}
public List<Path> compact(CompactionRequest request, int targetCount, long targetSize,
byte[] left, byte[] right, byte[] majorRangeFromRow, byte[] majorRangeToRow)
throws IOException {
if (LOG.isDebugEnabled()) {
LOG.debug("Executing compaction with " + targetSize
+ " target file size, no more than " + targetCount + " files, in ["
+ Bytes.toString(left) + "] [" + Bytes.toString(right) + "] range");
}
StripeMultiFileWriter writer = new StripeMultiFileWriter.SizeMultiWriter(
targetCount, targetSize, left, right);
return compactInternal(writer, request, majorRangeFromRow, majorRangeToRow);
}
private List<Path> compactInternal(StripeMultiFileWriter mw, CompactionRequest request,
byte[] majorRangeFromRow, byte[] majorRangeToRow) throws IOException {
final Collection<StoreFile> filesToCompact = request.getFiles();
final FileDetails fd = getFileDetails(filesToCompact, request.isMajor());
this.progress = new CompactionProgress(fd.maxKeyCount);
long smallestReadPoint = getSmallestReadPoint();
List<StoreFileScanner> scanners = createFileScanners(filesToCompact, smallestReadPoint);
boolean finished = false;
InternalScanner scanner = null;
boolean cleanSeqId = false;
try {
// Get scanner to use.
ScanType coprocScanType = ScanType.COMPACT_RETAIN_DELETES;
scanner = preCreateCoprocScanner(request, coprocScanType, fd.earliestPutTs, scanners);
if (scanner == null) {
scanner = (majorRangeFromRow == null)
? createScanner(store, scanners,
ScanType.COMPACT_RETAIN_DELETES, smallestReadPoint, fd.earliestPutTs)
: createScanner(store, scanners,
smallestReadPoint, fd.earliestPutTs, majorRangeFromRow, majorRangeToRow);
}
scanner = postCreateCoprocScanner(request, coprocScanType, scanner);
if (scanner == null) {
// NULL scanner returned from coprocessor hooks means skip normal processing.
return new ArrayList<Path>();
}
// Create the writer factory for compactions.
if(fd.minSeqIdToKeep > 0) {
smallestReadPoint = Math.min(fd.minSeqIdToKeep, smallestReadPoint);
cleanSeqId = true;
}
final Compression.Algorithm compression = store.getFamily().getCompactionCompression();
StripeMultiFileWriter.WriterFactory factory = new StripeMultiFileWriter.WriterFactory() {
@Override
public Writer createWriter() throws IOException {
return store.createWriterInTmp(
fd.maxKeyCount, compression, true, true, fd.maxTagsLength > 0);
}
};
// Prepare multi-writer, and perform the compaction using scanner and writer.
// It is ok here if storeScanner is null.
StoreScanner storeScanner = (scanner instanceof StoreScanner) ? (StoreScanner)scanner : null;
mw.init(storeScanner, factory, store.getComparator());
finished = performCompaction(scanner, mw, smallestReadPoint, cleanSeqId);
if (!finished) {
throw new InterruptedIOException( "Aborting compaction of store " + store +
" in region " + store.getRegionInfo().getRegionNameAsString() +
" because it was interrupted.");
}
} finally {
if (scanner != null) {
try {
scanner.close();
} catch (Throwable t) {
// Don't fail the compaction if this fails.
LOG.error("Failed to close scanner after compaction.", t);
}
}
if (!finished) {
for (Path leftoverFile : mw.abortWriters()) {
try {
store.getFileSystem().delete(leftoverFile, false);
} catch (Exception ex) {
LOG.error("Failed to delete the leftover file after an unfinished compaction.", ex);
}
}
}
}
assert finished : "We should have exited the method on all error paths";
List<Path> newFiles = mw.commitWriters(fd.maxSeqId, request.isMajor());
assert !newFiles.isEmpty() : "Should have produced an empty file to preserve metadata.";
return newFiles;
}
}