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

     [ https://issues.apache.org/jira/browse/SPARK-20953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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

> 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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