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https://issues.apache.org/jira/browse/TEZ-4209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167635#comment-17167635
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Rajesh Balamohan commented on TEZ-4209:
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Supposed to be created in Hive project. Ignore this ticket.
> 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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