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https://issues.apache.org/jira/browse/YARN-10075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siddharth Ahuja updated YARN-10075:
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Attachment: YARN-10075.001.patch
> historyContext doesn't need to be a class attribute inside JobHistoryServer
> ---------------------------------------------------------------------------
>
> Key: YARN-10075
> URL: https://issues.apache.org/jira/browse/YARN-10075
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: yarn
> Reporter: Siddharth Ahuja
> Assignee: Siddharth Ahuja
> Priority: Minor
> Attachments: YARN-10075.001.patch
>
>
> "historyContext" class attribute at
> https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/JobHistoryServer.java#L67
> is assigned a cast of another class attribute - "jobHistoryService" -
> https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/JobHistoryServer.java#L131,
> however it does not need to be stored separately because it is only ever
> used once in the clas, and that too as an argument while instantiating the
> HistoryClientService class at
> https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/JobHistoryServer.java#L155.
> Therefore, we could just delete the lines at
> https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/JobHistoryServer.java#L67
> and
> https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/JobHistoryServer.java#L131
> completely and instantiate the HistoryClientService as follows:
> {code}
> @VisibleForTesting
> protected HistoryClientService createHistoryClientService() {
> return new HistoryClientService((HistoryContext)jobHistoryService,
> this.jhsDTSecretManager);
> }
> {code}
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