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https://issues.apache.org/jira/browse/YARN-6339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15944399#comment-15944399
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yunjiong zhao commented on YARN-6339:
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Thanks [~wangda] & [~xgong] for your time.
> Improve performance for createAndGetApplicationReport
> -----------------------------------------------------
>
> Key: YARN-6339
> URL: https://issues.apache.org/jira/browse/YARN-6339
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: yunjiong zhao
> Assignee: yunjiong zhao
> Fix For: 2.8.1, 3.0.0-alpha3
>
> Attachments: YARN-6339.001.patch, YARN-6339.002.patch,
> YARN-6339.003.patch
>
>
> There are two performance issue when calling createAndGetApplicationReport:
> One is inside ProtoUtils.convertFromProtoFormat, replace is too slow for
> clusters which have more than 3000 nodes. Use substring is much better:
> https://issues.apache.org/jira/browse/YARN-6285?focusedCommentId=15923241&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15923241
> Another one is inside getLogAggregationReportsForApp, if some application's
> LogAggregationStatus is TIME_OUT, every time it was called it will create an
> HashMap which will produce lots of garbage.
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