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Posted to dev@hive.apache.org by "Lefty Leverenz (JIRA)" <ji...@apache.org> on 2014/02/01 13:46:10 UTC

[jira] [Commented] (HIVE-6347) ZeroCopy read path for ORC RecordReader

    [ https://issues.apache.org/jira/browse/HIVE-6347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13888559#comment-13888559 ] 

Lefty Leverenz commented on HIVE-6347:
--------------------------------------

The patch adds *hive.orc.zerocopy* to HiveConf.java, so it also needs to document the flag in hive-default.xml.template.

> 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
>
>
> 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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