org.apache.hudi.hadoop.realtime.HoodieCombineRealtimeRecordReader Maven / Gradle / Ivy
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* 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,
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*/
package org.apache.hudi.hadoop.realtime;
import org.apache.hudi.common.util.ValidationUtils;
import org.apache.hudi.hadoop.hive.HoodieCombineRealtimeFileSplit;
import org.apache.hadoop.hive.ql.io.IOContextMap;
import org.apache.hadoop.io.ArrayWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.lib.CombineFileSplit;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
/**
* Allows to read multiple realtime file splits grouped together by CombineInputFormat.
*/
public class HoodieCombineRealtimeRecordReader implements RecordReader {
private static final transient Logger LOG = LogManager.getLogger(HoodieCombineRealtimeRecordReader.class);
// RecordReaders for each split
List recordReaders = new LinkedList<>();
// Points to the currently iterating record reader
HoodieRealtimeRecordReader currentRecordReader;
public HoodieCombineRealtimeRecordReader(JobConf jobConf, CombineFileSplit split,
List readers) {
try {
ValidationUtils.checkArgument(((HoodieCombineRealtimeFileSplit) split).getRealtimeFileSplits().size() == readers
.size(), "Num Splits does not match number of unique RecordReaders!");
for (InputSplit rtSplit : ((HoodieCombineRealtimeFileSplit) split).getRealtimeFileSplits()) {
LOG.info("Creating new RealtimeRecordReader for split");
recordReaders.add(
new HoodieRealtimeRecordReader((HoodieRealtimeFileSplit) rtSplit, jobConf, readers.remove(0)));
}
currentRecordReader = recordReaders.remove(0);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public boolean next(NullWritable key, ArrayWritable value) throws IOException {
if (this.currentRecordReader.next(key, value)) {
return true;
} else if (recordReaders.size() > 0) {
this.currentRecordReader.close();
this.currentRecordReader = recordReaders.remove(0);
AbstractRealtimeRecordReader reader = (AbstractRealtimeRecordReader)currentRecordReader.getReader();
// when switch reader, ioctx should be updated
IOContextMap.get(reader.getJobConf()).setInputPath(reader.getSplit().getPath());
return next(key, value);
} else {
return false;
}
}
@Override
public NullWritable createKey() {
return this.currentRecordReader.createKey();
}
@Override
public ArrayWritable createValue() {
return this.currentRecordReader.createValue();
}
@Override
public long getPos() throws IOException {
return this.currentRecordReader.getPos();
}
@Override
public void close() throws IOException {
this.currentRecordReader.close();
}
@Override
public float getProgress() throws IOException {
return this.currentRecordReader.getProgress();
}
}