/*
* 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 com.facebook.giraph.hive.output;
import org.apache.hadoop.hive.serde2.Serializer;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.log4j.Logger;
import com.facebook.giraph.hive.common.ProgressReporter;
import com.facebook.giraph.hive.record.HiveWritableRecord;
import java.io.IOException;
/**
* RecordWriter implementation which tracks how long each single write is taking.
* When it detects that write is too slow, it closes the previous file and starts writing to
* the new one.
*/
public class ResettableRecordWriterImpl extends RecordWriterImpl {
/** Class logger */
private static Logger LOG = Logger.getLogger(ResettableRecordWriterImpl.class);
/** Task attempt context */
private final TaskAttemptContext taskAttemptContext;
/** Base output format */
private final org.apache.hadoop.mapred.OutputFormat baseOutputFormat;
/** When write takes longer than this time, new file will be opened to write to */
private final long writeTimeoutMs;
/**
* Constructor
*
* @param baseWriter Hadoop RecordWriter
* @param serializer Serializer
* @param objectInspector ObjectInspector
* @param taskAttemptContext Task attempt context
* @param baseOutputFormat Base output format
* @param writeTimeoutMs When write takes longer than this time,
* new file will be opened to write to
*/
public ResettableRecordWriterImpl(RecordWriter<WritableComparable, Writable> baseWriter,
Serializer serializer, ObjectInspector objectInspector, TaskAttemptContext taskAttemptContext,
org.apache.hadoop.mapred.OutputFormat baseOutputFormat, long writeTimeoutMs) {
super(baseWriter, serializer, objectInspector);
this.taskAttemptContext = taskAttemptContext;
this.baseOutputFormat = baseOutputFormat;
this.writeTimeoutMs = writeTimeoutMs;
}
@Override
public void write(WritableComparable key,
HiveWritableRecord value) throws IOException, InterruptedException {
long startTime = System.currentTimeMillis();
super.write(key, value);
long elapsedTime = System.currentTimeMillis() - startTime;
if (elapsedTime > writeTimeoutMs) {
if (LOG.isInfoEnabled()) {
LOG.info("write: Write taking too long (" + elapsedTime +
"s), creating new file to write to");
}
baseWriter.close(new ProgressReporter(taskAttemptContext));
baseWriter = HiveApiOutputFormat.getBaseRecordWriter(taskAttemptContext, baseOutputFormat);
}
}
}