org.apache.flink.runtime.accumulators.AccumulatorRegistry 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,
* 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.flink.runtime.accumulators;
import org.apache.flink.api.common.JobID;
import org.apache.flink.api.common.accumulators.Accumulator;
import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Main accumulator registry which encapsulates user-defined accumulators.
*/
public class AccumulatorRegistry {
protected static final Logger LOG = LoggerFactory.getLogger(AccumulatorRegistry.class);
protected final JobID jobID;
protected final ExecutionAttemptID taskID;
/* User-defined Accumulator values stored for the executing task. */
private final Map> userAccumulators =
new ConcurrentHashMap<>(4);
public AccumulatorRegistry(JobID jobID, ExecutionAttemptID taskID) {
this.jobID = jobID;
this.taskID = taskID;
}
/**
* Creates a snapshot of this accumulator registry.
* @return a serialized accumulator map
*/
public AccumulatorSnapshot getSnapshot() {
try {
return new AccumulatorSnapshot(jobID, taskID, userAccumulators);
} catch (Throwable e) {
LOG.warn("Failed to serialize accumulators for task.", e);
return null;
}
}
/**
* Gets the map for user-defined accumulators.
*/
public Map> getUserMap() {
return userAccumulators;
}
}