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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6347) ZeroCopy read path for ORC RecordReader
Date Sun, 16 Feb 2014 19:55:19 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13902800#comment-13902800
] 

Gopal V commented on HIVE-6347:
-------------------------------

munmap() is async and delayed action

> ZeroCopy read path for ORC RecordReader
> ---------------------------------------
>
>                 Key: HIVE-6347
>                 URL: https://issues.apache.org/jira/browse/HIVE-6347
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>    Affects Versions: tez-branch
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: HIVE-6347.1.patch, HIVE-6347.2-tez.patch, HIVE-6347.3-tez.patch
>
>
> ORC can use the new HDFS Caching APIs and the ZeroCopy readers to avoid extra data copies
into memory while scanning files.
> Implement ORC zcr codepath and a hive.orc.zerocopy flag.



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