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https://issues.apache.org/jira/browse/HIVE-10128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391176#comment-14391176
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Sergey Shelukhin commented on HIVE-10128:
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[~hagleitn] ping?
> BytesBytesMultiHashMap does not allow concurrent read-only access
> -----------------------------------------------------------------
>
> Key: HIVE-10128
> URL: https://issues.apache.org/jira/browse/HIVE-10128
> Project: Hive
> Issue Type: Bug
> Reporter: Gopal V
> Assignee: Sergey Shelukhin
> Fix For: llap
>
> Attachments: HIVE-10128.01.patch, HIVE-10128.02.patch,
> HIVE-10128.03.patch, HIVE-10128.patch, hashmap-after.png,
> hashmap-sync-source.png, hashmap-sync.png
>
>
> The multi-threaded performance takes a serious hit when LLAP shares
> hashtables between the probe threads running in parallel.
> !hashmap-sync.png!
> This is an explicit synchronized block inside ReusableRowContainer which
> triggers this particular pattern.
> !hashmap-sync-source.png!
> Looking deeper into the code, the synchronization seems to be caused due to
> the fact that WriteBuffers.setReadPoint modifies the otherwise read-only
> hashtable.
> To generate this sort of result, run LLAP at a WARN log-level, to avoid all
> the log synchronization that otherwise affects the thread sync.
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