/**
* 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.tez.mapreduce.common;
import java.io.IOException;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tez.mapreduce.hadoop.MRHelpers;
import org.apache.tez.mapreduce.protos.MRRuntimeProtos.MRInputUserPayloadProto;
import org.apache.tez.mapreduce.protos.MRRuntimeProtos.MRSplitProto;
import org.apache.tez.mapreduce.protos.MRRuntimeProtos.MRSplitsProto;
import org.apache.tez.runtime.api.Event;
import org.apache.tez.runtime.api.TezRootInputInitializer;
import org.apache.tez.runtime.api.TezRootInputInitializerContext;
import org.apache.tez.runtime.api.events.RootInputDataInformationEvent;
import org.apache.tez.runtime.api.events.RootInputUpdatePayloadEvent;
import com.google.common.base.Stopwatch;
import com.google.common.collect.Lists;
public class MRInputSplitDistributor implements TezRootInputInitializer {
private static final Log LOG = LogFactory
.getLog(MRInputSplitDistributor.class);
public MRInputSplitDistributor() {
}
private MRSplitsProto splitsProto;
@Override
public List<Event> initialize(TezRootInputInitializerContext rootInputContext)
throws IOException {
Stopwatch sw = null;
if (LOG.isDebugEnabled()) {
sw = new Stopwatch().start();
}
MRInputUserPayloadProto userPayloadProto = MRHelpers.parseMRInputPayload(rootInputContext.getUserPayload());
if (LOG.isDebugEnabled()) {
sw.stop();
LOG.debug("Time to parse MRInput payload into prot: "
+ sw.elapsedMillis());
}
this.splitsProto = userPayloadProto.getSplits();
MRInputUserPayloadProto.Builder updatedPayloadBuilder = MRInputUserPayloadProto.newBuilder(userPayloadProto);
updatedPayloadBuilder.clearSplits();
List<Event> events = Lists.newArrayListWithCapacity(this.splitsProto.getSplitsCount() + 1);
RootInputUpdatePayloadEvent updatePayloadEvent = new RootInputUpdatePayloadEvent(
updatedPayloadBuilder.build().toByteArray());
events.add(updatePayloadEvent);
int count = 0;
for (MRSplitProto mrSplit : this.splitsProto.getSplitsList()) {
// Unnecessary array copy, can be avoided by using ByteBuffer instead of a
// raw array.
RootInputDataInformationEvent diEvent = new RootInputDataInformationEvent(
count++, mrSplit.toByteArray());
events.add(diEvent);
}
return events;
}
}