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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HIVE-23953) Use task counter information to compute keycount during hashtable loading
Date Tue, 04 Aug 2020 07:21:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-23953?focusedWorklogId=466073&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-466073
]

ASF GitHub Bot logged work on HIVE-23953:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 04/Aug/20 07:20
            Start Date: 04/Aug/20 07:20
    Worklog Time Spent: 10m 
      Work Description: rbalamohan commented on pull request #1340:
URL: https://github.com/apache/hive/pull/1340#issuecomment-668426658


   LGTM. +1 pending tests.


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

    Worklog Id:     (was: 466073)
    Time Spent: 0.5h  (was: 20m)

> Use task counter information to compute keycount during hashtable loading
> -------------------------------------------------------------------------
>
>                 Key: HIVE-23953
>                 URL: https://issues.apache.org/jira/browse/HIVE-23953
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>            Assignee: mahesh kumar behera
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> There are cases when compiler misestimates key count and this results in a number of
hashtable resizes during runtime.
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/vector/mapjoin/fast/VectorMapJoinFastHashTableLoader.java#L128]
> In such cases, it would be good to get "approximate_input_records" (TEZ-4207) counter
from upstream to compute the key count more accurately at runtime.
>  
>  * 
>  * 
> Options
> h4.  



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