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https://issues.apache.org/jira/browse/HIVE-6347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14021861#comment-14021861
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Lefty Leverenz commented on HIVE-6347:
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*hive.exec.orc.zerocopy* is documented in hive-default.xml.template as of Hive
0.13.0 with the description "Use zerocopy reads with ORC." See HIVE-6360.
In the wiki its description has been expanded to "Use zerocopy reads with ORC.
(This requires Hadoop 2.3 or later.)"
* [Configuration Properties: hive.exec.orc.zerocopy |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.exec.orc.zerocopy]
> 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
> Fix For: tez-branch
>
> Attachments: HIVE-6347.1.patch, HIVE-6347.2-tez.patch,
> HIVE-6347.3-tez.patch, HIVE-6347.4-tez.patch, HIVE-6347.5-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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