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Posted to dev@tez.apache.org by "Rajesh Balamohan (Jira)" <ji...@apache.org> on 2020/07/30 05:00:00 UTC
[jira] [Resolved] (TEZ-4209) Use task counter information to
compute keycount during hashtable loading
[ https://issues.apache.org/jira/browse/TEZ-4209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rajesh Balamohan resolved TEZ-4209.
-----------------------------------
Resolution: Won't Fix
> Use task counter information to compute keycount during hashtable loading
> -------------------------------------------------------------------------
>
> Key: TEZ-4209
> URL: https://issues.apache.org/jira/browse/TEZ-4209
> 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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