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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5091) ORC files should have an option to pad stripes to the HDFS block boundaries
Date Thu, 07 Aug 2014 21:13:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14089861#comment-14089861
] 

Lefty Leverenz commented on HIVE-5091:
--------------------------------------

Doc note:  This changed the default value of configuration parameter *hive.exec.orc.write.format*
from 0.11 to null (before it was first released in 0.12).

*hive.exec.orc.write.format* was created in HIVE-4123, and it's documented in the wiki here:

* [Configuration Properties -- hive.exec.orc.write.format | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.exec.orc.write.format]

> ORC files should have an option to pad stripes to the HDFS block boundaries
> ---------------------------------------------------------------------------
>
>                 Key: HIVE-5091
>                 URL: https://issues.apache.org/jira/browse/HIVE-5091
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.12.0
>
>         Attachments: HIVE-5091.D12249.1.patch, HIVE-5091.D12249.2.patch, HIVE-5091.D12249.3.patch
>
>
> With ORC stripes being large, if a stripe straddles an HDFS block, the locality of read
is suboptimal. It would be good to add padding to ensure that stripes don't straddle HDFS
blocks.



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