eu.stratosphere.nephele.taskmanager.TaskInputSplitProvider Maven / Gradle / Ivy
/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed 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 eu.stratosphere.nephele.taskmanager;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
import eu.stratosphere.core.io.InputSplit;
import eu.stratosphere.nephele.executiongraph.ExecutionVertexID;
import eu.stratosphere.nephele.jobgraph.JobID;
import eu.stratosphere.nephele.jobmanager.splitassigner.InputSplitWrapper;
import eu.stratosphere.nephele.protocols.InputSplitProviderProtocol;
import eu.stratosphere.nephele.template.InputSplitProvider;
import eu.stratosphere.nephele.types.IntegerRecord;
import eu.stratosphere.util.StringUtils;
/**
* The task input split provider is a component of the task manager which implements the {@link InputSplitProvider}
* interface. It is called by a task in order to acquire a new input split to consume. The task input split provider in
* return will call the global input split provider to retrieve a new input split.
*
* This class is thread-safe.
*
*/
public class TaskInputSplitProvider implements InputSplitProvider {
private final JobID jobID;
private final ExecutionVertexID executionVertexID;
private final InputSplitProviderProtocol globalInputSplitProvider;
private final AtomicInteger sequenceNumber = new AtomicInteger(0);
TaskInputSplitProvider(final JobID jobID, final ExecutionVertexID executionVertexID,
final InputSplitProviderProtocol globalInputSplitProvider) {
this.jobID = jobID;
this.executionVertexID = executionVertexID;
this.globalInputSplitProvider = globalInputSplitProvider;
}
@Override
public InputSplit getNextInputSplit() {
try {
synchronized (this.globalInputSplitProvider) {
final InputSplitWrapper wrapper = this.globalInputSplitProvider.requestNextInputSplit(this.jobID,
this.executionVertexID, new IntegerRecord(this.sequenceNumber.getAndIncrement()));
return wrapper.getInputSplit();
}
} catch (IOException ioe) {
// Convert IOException into a RuntimException and let the regular fault tolerance routines take care of the
// rest
throw new RuntimeException(StringUtils.stringifyException(ioe));
}
}
}