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