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https://issues.apache.org/jira/browse/HDFS-1043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12847629#action_12847629
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Suresh Srinivas commented on HDFS-1043:
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+1 for the patch. I am surprised that ConcurrentHashMap used for caching groups
affects the performance when using 100 threads. We should perhaps create a bug
to track this optimization.
> Benchmark overhead of server-side group resolution of users
> -----------------------------------------------------------
>
> Key: HDFS-1043
> URL: https://issues.apache.org/jira/browse/HDFS-1043
> Project: Hadoop HDFS
> Issue Type: Test
> Components: benchmarks
> Affects Versions: 0.22.0
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: 0.22.0
>
> Attachments: UGCRefresh.patch, UGCRefresh.patch
>
>
> Server-side user group resolution was introduced in HADOOP-4656.
> The benchmark should repeatedly request the name-node for user group
> resolution, and reset NN's user group cache periodically.
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