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https://issues.apache.org/jira/browse/SPARK-21941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-21941:
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Assignee: Apache Spark
> Stop storing unused attemptId in SQLTaskMetrics
> -----------------------------------------------
>
> Key: SPARK-21941
> URL: https://issues.apache.org/jira/browse/SPARK-21941
> Project: Spark
> Issue Type: Bug
> Components: Web UI
> Affects Versions: 2.2.0
> Reporter: Andrew Ash
> Assignee: Apache Spark
>
> Currently SQLTaskMetrics has a long attemptId field on it that is unused,
> with a TODO saying to populate the value in the future. We should save this
> memory by leaving the TODO but taking the unused field out of the class.
> I have a driver that heap dumped on OOM and has 390,105 instances of
> SQLTaskMetric -- removing this 8 bytes field will save roughly 390k*8 = 3.1MB
> of heap space. It's not going to fix my OOM, but there's no reason to put
> this pressure on the GC if we don't get anything by storing it.
> https://github.com/apache/spark/blob/v2.2.0/sql/core/src/main/scala/org/apache/spark/sql/execution/ui/SQLListener.scala#L485
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