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https://issues.apache.org/jira/browse/SPARK-12251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Or resolved SPARK-12251.
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Resolution: Fixed
> Document Spark 1.6's off-heap memory configurations and add config validation
> -----------------------------------------------------------------------------
>
> Key: SPARK-12251
> URL: https://issues.apache.org/jira/browse/SPARK-12251
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Fix For: 1.6.0
>
>
> We need to document the new off-heap memory limit configurations which were
> added in Spark 1.6, add simple configuration validation (for instance, you
> shouldn't be able to enable off-heap execution when the off-heap memory limit
> is zero), and alias the old and confusing `spark.unsafe.offHeap`
> configuration to something that lives in the `spark.memory` namespace.
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