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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.mapreduce;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.HTable;
import com.google.common.annotations.VisibleForTesting;
/**
* Buffers writes for Deletes in addition to Puts. Buffering Deletes can significantly speed up
* MapReduce jobs. The order of both Mutation types is preserved in the write buffer, and a buffer
* flush can be triggered by either Put or Delete operations.
*/
@InterfaceAudience.Private
public class BufferedHTable extends HTable {
private boolean closed = false;
public BufferedHTable(Configuration conf, String tableName) throws IOException {
super(conf, tableName);
}
public BufferedHTable(Configuration conf, byte[] tableName) throws IOException {
super(conf, tableName);
}
@Override
public void delete(Delete delete) throws IOException {
doDelete(delete);
}
@Override
public void delete(List deletes) throws IOException {
for (Delete delete : deletes) {
doDelete(delete);
}
}
private void doDelete(Delete delete) throws IOException {
if (this.closed) {
throw new IllegalStateException("BufferedHTable was closed");
}
this.currentWriteBufferSize += delete.heapSize();
this.writeAsyncBuffer.add(delete);
// flush when write buffer size exceeds configured limit
if (this.currentWriteBufferSize > getWriteBufferSize()) {
flushCommits();
}
}
@Override
public void close() throws IOException {
if (this.closed) {
return;
}
flushCommits();
this.closed = true;
super.close();
}
@VisibleForTesting
long getCurrentWriteBufferSize() {
return this.currentWriteBufferSize;
}
}