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From "Liang-Chi Hsieh (JIRA)" <>
Subject [jira] [Resolved] (SPARK-20953) Add hash map metrics to aggregate and join
Date Sat, 01 Jul 2017 02:39:01 GMT


Liang-Chi Hsieh resolved SPARK-20953.
    Resolution: Fixed

> Add hash map metrics to aggregate and join
> ------------------------------------------
>                 Key: SPARK-20953
>                 URL:
>             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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