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https://issues.apache.org/jira/browse/SPARK-3535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14134592#comment-14134592
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Andrew Ash commented on SPARK-3535:
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Why does the task need extra memory if the heap size equals the available task
memory? Filesystem cache?
> Spark on Mesos not correctly setting heap overhead
> --------------------------------------------------
>
> Key: SPARK-3535
> URL: https://issues.apache.org/jira/browse/SPARK-3535
> Project: Spark
> Issue Type: Bug
> Components: Mesos
> Affects Versions: 1.1.0
> Reporter: Brenden Matthews
>
> Spark on Mesos does account for any memory overhead. The result is that
> tasks are OOM killed nearly 95% of the time.
> Like with the Hadoop on Mesos project, Spark should set aside 15-25% of the
> executor memory for JVM overhead.
> For example, see:
> https://github.com/mesos/hadoop/blob/master/src/main/java/org/apache/hadoop/mapred/ResourcePolicy.java#L55-L63
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