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/**
* 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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.regionserver.AbstractMultiFileWriter;
import org.apache.hadoop.hbase.regionserver.AbstractMultiFileWriter.WriterFactory;
import org.apache.hadoop.hbase.regionserver.InternalScanner;
import org.apache.hadoop.hbase.regionserver.Store;
import org.apache.hadoop.hbase.regionserver.StoreFile.Writer;
import org.apache.hadoop.hbase.regionserver.StoreScanner;
/**
* Base class for implementing a Compactor which will generate multiple output files after
* compaction.
*/
@InterfaceAudience.Private
public abstract class AbstractMultiOutputCompactor
extends Compactor {
private static final Log LOG = LogFactory.getLog(AbstractMultiOutputCompactor.class);
public AbstractMultiOutputCompactor(Configuration conf, Store store) {
super(conf, store);
}
protected void initMultiWriter(AbstractMultiFileWriter writer, InternalScanner scanner,
final FileDetails fd, final boolean shouldDropBehind) {
WriterFactory writerFactory = new WriterFactory() {
@Override
public Writer createWriter() throws IOException {
return createTmpWriter(fd, shouldDropBehind);
}
};
// 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;
writer.init(storeScanner, writerFactory);
}
@Override
protected void abortWriter(T writer) throws IOException {
FileSystem fs = store.getFileSystem();
for (Path leftoverFile : writer.abortWriters()) {
try {
fs.delete(leftoverFile, false);
} catch (IOException e) {
LOG.warn(
"Failed to delete the leftover file " + leftoverFile + " after an unfinished compaction.",
e);
}
}
}
}