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https://issues.apache.org/jira/browse/SPARK-32994?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lantao Jin updated SPARK-32994:
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Description:
We use Spark + Delta Lake, recently we find our Spark driver faced full GC
problem (very heavy) when users submit a MERGE INTO query. The driver held over
100GB memory (depends on how much the max heap size set) and can not be GC
forever. By making a heap dump we found the root cause.
!Screen Shot 2020-09-25 at 11.32.51 AM.png | width=100%!
was:
We use Spark + Delta Lake, recently we find our Spark driver faced full GC
problem (very heavy) when users submit a MERGE INTO query. The driver held over
100GB memory (depends on how much the max heap size set) and can not be GC
forever. By making a heap dump we found the root cause.
!Screen Shot 2020-09-25 at 11.32.51 AM.png!
> External accumulators (not start with InternalAccumulator.METRICS_PREFIX) may
> lead driver full GC problem
> ---------------------------------------------------------------------------------------------------------
>
> Key: SPARK-32994
> URL: https://issues.apache.org/jira/browse/SPARK-32994
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, SQL
> Affects Versions: 2.4.7, 3.0.1, 3.1.0
> Reporter: Lantao Jin
> Priority: Major
> Attachments: Screen Shot 2020-09-25 at 11.32.51 AM.png, Screen Shot
> 2020-09-25 at 11.35.01 AM.png, Screen Shot 2020-09-25 at 11.36.48 AM.png
>
>
> We use Spark + Delta Lake, recently we find our Spark driver faced full GC
> problem (very heavy) when users submit a MERGE INTO query. The driver held
> over 100GB memory (depends on how much the max heap size set) and can not be
> GC forever. By making a heap dump we found the root cause.
> !Screen Shot 2020-09-25 at 11.32.51 AM.png | width=100%!
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