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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7509) Fast stripe level merging for ORC
Date Fri, 17 Oct 2014 06:15:33 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14174761#comment-14174761
] 

Lefty Leverenz commented on HIVE-7509:
--------------------------------------

Good docs [~prasanth_j].  I added some links and included CONCATENATE in the ORC doc:

* [ORC -- HiveQLSyntax | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+ORC#LanguageManualORC-HiveQLSyntax]

Question:  In the wiki's description of *hive.merge.orcfile.stripe.level* you added another
parameter that isn't mentioned in HiveConf.java:  "When hive.merge.mapfiles, hive.merge.mapredfiles
or hive.merge.tezfiles is enabled" (tezfiles is the new one).  Should I make that change in
HiveConf along with the other fixes in HIVE-6586?

* [Configuration Properties -- hive.merge.orcfile.stripe.level | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.merge.orcfile.stripe.level]

> Fast stripe level merging for ORC
> ---------------------------------
>
>                 Key: HIVE-7509
>                 URL: https://issues.apache.org/jira/browse/HIVE-7509
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.14.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>              Labels: orcfile
>             Fix For: 0.14.0
>
>         Attachments: HIVE-7509.1.patch, HIVE-7509.2.patch, HIVE-7509.3.patch, HIVE-7509.4.patch,
HIVE-7509.5.patch
>
>
> Similar to HIVE-1950, add support for fast stripe level merging of ORC files through
CONCATENATE command and conditional merge task. This fast merging is ideal for merging many
small ORC files to a larger file without decompressing and decoding the data of small orc
files.



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