/**
* 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.mapred.split;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Evolving;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.tez.dag.api.TezUncheckedException;
/**
* Implements an InputSplit that provides a generic wrapper around
* a group of real InputSplits
*/
@Public
@Evolving
public class TezGroupedSplit implements InputSplit, Configurable {
List<InputSplit> wrappedSplits = null;
String wrappedInputFormatName = null;
String[] locations = null;
String rack = null;
long length = 0;
Configuration conf;
public TezGroupedSplit() {
}
public TezGroupedSplit(int numSplits, String wrappedInputFormatName,
String[] locations, String rack) {
this.wrappedSplits = new ArrayList<InputSplit>(numSplits);
this.wrappedInputFormatName = wrappedInputFormatName;
this.locations = locations;
this.rack = rack;
}
public TezGroupedSplit(int numSplits, String wrappedInputFormatName,
String[] locations) {
this(numSplits, wrappedInputFormatName, locations, null);
}
public List<InputSplit> getGroupedSplits() {
return wrappedSplits;
}
public void addSplit(InputSplit split) {
wrappedSplits.add(split);
try {
length += split.getLength();
} catch (Exception e) {
throw new TezUncheckedException(e);
}
}
@Override
public void write(DataOutput out) throws IOException {
if (wrappedSplits == null) {
throw new TezUncheckedException("Wrapped splits cannot be empty");
}
Text.writeString(out, wrappedInputFormatName);
Text.writeString(out, wrappedSplits.get(0).getClass().getName());
out.writeInt(wrappedSplits.size());
for(InputSplit split : wrappedSplits) {
writeWrappedSplit(split, out);
}
out.writeLong(length);
if (locations == null || locations.length == 0) {
out.writeInt(0);
} else {
out.writeInt(locations.length);
for (String location : locations) {
Text.writeString(out, location);
}
}
}
@SuppressWarnings("unchecked")
@Override
public void readFields(DataInput in) throws IOException {
wrappedInputFormatName = Text.readString(in);
String inputSplitClassName = Text.readString(in);
Class<? extends InputSplit> clazz =
(Class<? extends InputSplit>)
TezGroupedSplitsInputFormat.getClassFromName(inputSplitClassName);
int numSplits = in.readInt();
wrappedSplits = new ArrayList<InputSplit>(numSplits);
for (int i=0; i<numSplits; ++i) {
addSplit(readWrappedSplit(in, clazz));
}
long recordedLength = in.readLong();
if(recordedLength != length) {
throw new TezUncheckedException("Expected length: " + recordedLength
+ " actual length: " + length);
}
int numLocs = in.readInt();
if (numLocs > 0) {
locations = new String[numLocs];
for (int i=0; i<numLocs; ++i) {
locations[i] = Text.readString(in);
}
}
}
void writeWrappedSplit(InputSplit split, DataOutput out) throws IOException {
split.write(out);
}
InputSplit readWrappedSplit(DataInput in, Class<? extends InputSplit> clazz)
throws IOException {
InputSplit split;
try {
split = ReflectionUtils.newInstance(clazz, conf);
} catch (Exception e) {
throw new TezUncheckedException(e);
}
split.readFields(in);
return split;
}
@Override
public long getLength() throws IOException {
return length;
}
@Override
public String[] getLocations() throws IOException {
return locations;
}
@Override
public void setConf(Configuration conf) {
this.conf = conf;
}
@Override
public Configuration getConf() {
return conf;
}
public String getRack() {
return rack;
}
}