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https://issues.apache.org/jira/browse/HDFS-11898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16032260#comment-16032260
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Konstantin Shvachko commented on HDFS-11898:
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The concept of {{HEDGED_READ_THREAD_POOL}} looks broken to me.
* I think we should not have it static and name it up to naming conventions:
{{hedgedReadThreadPool}}.
* DFSClients are cached so this will be a common pool per URI. Keeping it
common for all URIs is not right.
* Also I think we should reset {{hedgedReadThreadPool}} in
{{initThreadsNumForHedgedReads()}} when the number of threads is {{num <= 0}}.
Now we reset the pool if {{num > 0}}, why 0 should be different.
* This should solve HDFS-11900 as well.
> DFSClient#isHedgedReadsEnabled() should be per client flag
> -----------------------------------------------------------
>
> Key: HDFS-11898
> URL: https://issues.apache.org/jira/browse/HDFS-11898
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Attachments: HDFS-11898-01.patch
>
>
> DFSClient#isHedgedReadsEnabled() returns value based on static
> {{HEDGED_READ_THREAD_POOL}}.
> Hence if any of the client initialized this in JVM, all remaining client
> reads will be going through hedged read itself.
> This flag should be per client value.
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