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https://issues.apache.org/jira/browse/SPARK-20953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043581#comment-16043581
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Reynold Xin commented on SPARK-20953:
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I'd show the avg in the UI if possible. As a matter of fact maybe only show the
avg.
> Add hash map metrics to aggregate and join
> ------------------------------------------
>
> Key: SPARK-20953
> URL: https://issues.apache.org/jira/browse/SPARK-20953
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Reynold Xin
>
> It would be useful if we can identify hash map collision issues early on.
> We should add avg hash map probe metric to aggregate operator and hash join
> operator and report them. If the avg probe is greater than a specific
> (configurable) threshold, we should log an error at runtime.
> The primary classes to look at are UnsafeFixedWidthAggregationMap,
> HashAggregateExec, HashedRelation, HashJoin.
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