hadoop OfflineAggregationWriter 源码
haddop OfflineAggregationWriter 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/OfflineAggregationWriter.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.yarn.server.timelineservice.storage;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.service.AbstractService;
import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntities;
import org.apache.hadoop.yarn.api.records.timelineservice.TimelineWriteResponse;
import org.apache.hadoop.yarn.server.timelineservice.collector.TimelineCollectorContext;
import org.apache.hadoop.yarn.server.timelineservice.storage.common.OfflineAggregationInfo;
import java.io.IOException;
/**
* YARN timeline service v2 offline aggregation storage interface.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public abstract class OfflineAggregationWriter extends AbstractService {
/**
* Construct the offline writer.
*
* @param name service name
*/
public OfflineAggregationWriter(String name) {
super(name);
}
/**
* Persist aggregated timeline entities to the offline store based on which
* track this entity is to be rolled up to. The tracks along which
* aggregations are to be done are given by {@link OfflineAggregationInfo}.
*
* @param context a {@link TimelineCollectorContext} object that describes the
* context information of the aggregated data. Depends on the
* type of the aggregation, some fields of this context maybe
* empty or null.
* @param entities {@link TimelineEntities} to be persisted.
* @param info an {@link OfflineAggregationInfo} object that describes the
* detail of the aggregation. Current supported option is
* {@link OfflineAggregationInfo#FLOW_AGGREGATION}.
* @return a {@link TimelineWriteResponse} object.
* @throws IOException if any problem occurs while writing aggregated
* entities.
*/
abstract TimelineWriteResponse writeAggregatedEntity(
TimelineCollectorContext context, TimelineEntities entities,
OfflineAggregationInfo info) throws IOException;
}
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