org.apache.flink.runtime.operators.chaining.ChainedAllReduceDriver Maven / Gradle / Ivy
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.operators.chaining;
import org.apache.flink.api.common.functions.Function;
import org.apache.flink.api.common.functions.ReduceFunction;
import org.apache.flink.api.common.functions.util.FunctionUtils;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.TypeSerializerFactory;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable;
import org.apache.flink.runtime.operators.BatchTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ChainedAllReduceDriver extends ChainedDriver {
private static final Logger LOG = LoggerFactory.getLogger(ChainedAllReduceDriver.class);
// --------------------------------------------------------------------------------------------
private ReduceFunction reducer;
private TypeSerializer serializer;
private IT base;
// --------------------------------------------------------------------------------------------
@Override
public void setup(AbstractInvokable parent) {
@SuppressWarnings("unchecked")
final ReduceFunction red = BatchTask.instantiateUserCode(this.config, userCodeClassLoader, ReduceFunction.class);
this.reducer = red;
FunctionUtils.setFunctionRuntimeContext(red, getUdfRuntimeContext());
TypeSerializerFactory serializerFactory = this.config.getInputSerializer(0, userCodeClassLoader);
this.serializer = serializerFactory.getSerializer();
if (LOG.isDebugEnabled()) {
LOG.debug("ChainedAllReduceDriver object reuse: " + (this.objectReuseEnabled ? "ENABLED" : "DISABLED") + ".");
}
}
@Override
public void openTask() throws Exception {
Configuration stubConfig = this.config.getStubParameters();
BatchTask.openUserCode(this.reducer, stubConfig);
}
@Override
public void closeTask() throws Exception {
BatchTask.closeUserCode(this.reducer);
}
@Override
public void cancelTask() {
try {
FunctionUtils.closeFunction(this.reducer);
} catch (Throwable t) {
}
}
// --------------------------------------------------------------------------------------------
@Override
public Function getStub() {
return this.reducer;
}
@Override
public String getTaskName() {
return this.taskName;
}
// --------------------------------------------------------------------------------------------
@Override
public void collect(IT record) {
numRecordsIn.inc();
try {
if (base == null) {
base = serializer.copy(record);
} else {
base = objectReuseEnabled ? reducer.reduce(base, record) : serializer.copy(reducer.reduce(base, record));
}
} catch (Exception e) {
throw new ExceptionInChainedStubException(taskName, e);
}
}
@Override
public void close() {
try {
if (base != null) {
this.outputCollector.collect(base);
base = null;
}
} catch (Exception e) {
throw new ExceptionInChainedStubException(this.taskName, e);
}
this.outputCollector.close();
}
}