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From "Thomas Poepping (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-14165) Remove Hive file listing during split computation
Date Wed, 21 Dec 2016 13:18:58 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15767035#comment-15767035
] 

Thomas Poepping commented on HIVE-14165:
----------------------------------------

Hi Sahil,

When you update the patch, can you create a new ReviewBoard submission?

WRT the <tt>InputFormat</tt> issue, my feeling is that we should stray away from
backwards-incompatible changes. Is there no way we can avoid the backwards-incompatible change,
but still avoid the unnecessary list? 

I will be able to provide more targeted feedback once the RB submission has been updated.

> Remove Hive file listing during split computation
> -------------------------------------------------
>
>                 Key: HIVE-14165
>                 URL: https://issues.apache.org/jira/browse/HIVE-14165
>             Project: Hive
>          Issue Type: Sub-task
>    Affects Versions: 2.1.0
>            Reporter: Abdullah Yousufi
>            Assignee: Sahil Takiar
>         Attachments: HIVE-14165.02.patch, HIVE-14165.03.patch, HIVE-14165.04.patch, HIVE-14165.05.patch,
HIVE-14165.06.patch, HIVE-14165.patch
>
>
> The Hive side listing in FetchOperator.java is unnecessary, since Hadoop's FileInputFormat.java
will list the files during split computation anyway to determine their size. One way to remove
this is to catch the InvalidInputFormat exception thrown by FileInputFormat#getSplits() on
the Hive side instead of doing the file listing beforehand.
> For S3 select queries on partitioned tables, this results in a 2x speedup.



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