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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17852) remove support for list bucketing "stored as directories" in 3.0
Date Thu, 17 May 2018 17:01:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479376#comment-16479376
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Ashutosh Chauhan commented on HIVE-17852:
-----------------------------------------

+1
[~abstractdog] Can you reupload a patch to get another run?

> remove support for list bucketing "stored as directories" in 3.0
> ----------------------------------------------------------------
>
>                 Key: HIVE-17852
>                 URL: https://issues.apache.org/jira/browse/HIVE-17852
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Laszlo Bodor
>            Priority: Major
>         Attachments: HIVE-17852.01.patch, HIVE-17852.02.patch
>
>
> From the email thread:
> 1) LB, when stored as directories, adds a lot of low-level complexity to Hive tables
that has to be accounted for in many places in the code where the files are written or modified
- from FSOP to ACID/replication/export.
> 2) While working on some FSOP code I noticed that some of that logic is broken - e.g.
the duplicate file removal from tasks, a pretty fundamental correctness feature in Hive, may
be broken. LB also doesn’t appear to be compatible with e.g. regular bucketing.
> 3) The feature hasn’t seen development activity in a while; it also doesn’t appear
to be used a lot.
> Keeping with the theme of cleaning up “legacy” code for 3.0, I was proposing we remove
it.
> (2) also suggested that, if needed, it might be easier to implement similar functionality
by adding some flexibility to partitions (which LB directories look like anyway); that would
also keep the logic on a higher level of abstraction (split generation, partition pruning)
as opposed to many low-level places like FSOP, etc.



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