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Posted to dev@tez.apache.org by "Rajesh Balamohan (Jira)" <ji...@apache.org> on 2020/07/30 05:01:00 UTC

[jira] [Resolved] (TEZ-4210) Use task counter information to compute keycount during hashtable loading

     [ https://issues.apache.org/jira/browse/TEZ-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rajesh Balamohan resolved TEZ-4210.
-----------------------------------
    Resolution: Won't Fix

> Use task counter information to compute keycount during hashtable loading
> -------------------------------------------------------------------------
>
>                 Key: TEZ-4210
>                 URL: https://issues.apache.org/jira/browse/TEZ-4210
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>            Priority: Major
>
> 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.
>  



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