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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10174) LLAP: ORC MemoryManager is singleton synchronized
Date Wed, 01 Apr 2015 04:10:52 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389958#comment-14389958
] 

Gopal V commented on HIVE-10174:
--------------------------------

Performance difference is somewhere along the lines of 34s with the MemoryManager + addRow
synchronized blocks vs 9s without the MemoryManager and the addRow synchronized(this).

To be looked at when we're writing ORC out of LLAP.

> LLAP: ORC MemoryManager is singleton synchronized
> -------------------------------------------------
>
>                 Key: HIVE-10174
>                 URL: https://issues.apache.org/jira/browse/HIVE-10174
>             Project: Hive
>          Issue Type: Sub-task
>          Components: File Formats
>    Affects Versions: llap
>            Reporter: Gopal V
>         Attachments: orc-memorymanager-1.png, orc-memorymanager-2.png
>
>
> ORC MemoryManager::addedRow() checks are bad for LLAP multi-threaded performance.
> !orc-memorymanager-1.png!
> !orc-memorymanager-2.png!



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