hadoop HistoryEvent 源码
haddop HistoryEvent 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/jobhistory/HistoryEvent.java
/**
* 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.mapreduce.jobhistory;
import java.util.Set;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEvent;
import org.apache.hadoop.yarn.api.records.timelineservice.TimelineMetric;
/**
* Interface for event wrapper classes. Implementations each wrap an
* Avro-generated class, adding constructors and accessor methods.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public interface HistoryEvent {
/** Return this event's type. */
EventType getEventType();
/** Return the Avro datum wrapped by this. */
Object getDatum();
/** Set the Avro datum wrapped by this. */
void setDatum(Object datum);
/**
* Map HistoryEvent to TimelineEvent.
*
* @return the timeline event
*/
TimelineEvent toTimelineEvent();
/**
* Counters or Metrics if any else return null.
*
* @return the set of timeline metrics
*/
Set<TimelineMetric> getTimelineMetrics();
}
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