[jira] [Commented] (SPARK-20953) Add hash map metrics to aggregate and join

["Reynold Xin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-20953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16033470#comment-16033470 ] 

Reynold Xin commented on SPARK-20953:
-------------------------------------

cc [~viirya] want to give this a try? 

> 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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