[jira] [Assigned] (HIVE-23953) Use task counter information to compute keycount during hashtable loading

["mahesh kumar behera (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-23953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

mahesh kumar behera reassigned HIVE-23953:
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    Assignee: mahesh kumar behera

> 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: 10m
>  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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