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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HIVE-23735) Reducer misestimate for export command
Date Tue, 01 Sep 2020 00:47:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-23735?focusedWorklogId=476926&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-476926
]

ASF GitHub Bot logged work on HIVE-23735:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 01/Sep/20 00:46
            Start Date: 01/Sep/20 00:46
    Worklog Time Spent: 10m 
      Work Description: github-actions[bot] commented on pull request #1165:
URL: https://github.com/apache/hive/pull/1165#issuecomment-684124135


   This pull request has been automatically marked as stale because it has not had recent
activity. It will be closed if no further activity occurs.
   Feel free to reach out on the dev@hive.apache.org list if the patch is in need of reviews.


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 476926)
    Time Spent: 20m  (was: 10m)

> Reducer misestimate for export command
> --------------------------------------
>
>                 Key: HIVE-23735
>                 URL: https://issues.apache.org/jira/browse/HIVE-23735
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-23735.1.wip.patch
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java#L6869
> {code}
> if (dest_tab.getNumBuckets() > 0) {
> ...
> }
> {code}
> For "export" command, HS2 creates a dummy table and for this table and gets "1" as the
number of buckets.
> {noformat}
> set hive.stats.autogather=false;
> export table sample_table to '/tmp/export/sampe_db/t1';
> {noformat}
> This causes issues in reducer estimates and always lands up with '1' as the number of
reducer task. 



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