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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-10191) ORC: Cleanup writer per-row synchronization
Date Thu, 03 Sep 2015 17:41:46 GMT

     [ https://issues.apache.org/jira/browse/HIVE-10191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth Jayachandran updated HIVE-10191:
-----------------------------------------
    Labels: TODOC1.3  (was: )

> ORC: Cleanup writer per-row synchronization
> -------------------------------------------
>
>                 Key: HIVE-10191
>                 URL: https://issues.apache.org/jira/browse/HIVE-10191
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>    Affects Versions: 1.2.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>              Labels: TODOC1.3
>             Fix For: 1.3.0, 2.0.0
>
>         Attachments: HIVE-10191.1.patch, HIVE-10191.2.patch, HIVE-10191.3.patch, HIVE-10191.4.patch,
HIVE-10191.5.patch
>
>
> ORC writers were originally meant to be thread-safe, but in the present day implementation
each ORC writer is entirely share-nothing which converts most of the synchronized blocks in
ORC as entirely uncontested locks.
> These uncontested locks prevent the JVM from inlining/optimizing these methods, while
adding no extra thread-safety to the ORC writers.



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