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https://issues.apache.org/jira/browse/SPARK-23129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16328543#comment-16328543
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Apache Spark commented on SPARK-23129:
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User 'caneGuy' has created a pull request for this issue:
https://github.com/apache/spark/pull/20292
> Lazy init DiskMapIterator#deserializeStream to reduce memory usage when
> ExternalAppendOnlyMap spill too much times
> -------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-23129
> URL: https://issues.apache.org/jira/browse/SPARK-23129
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.1.0
> Reporter: zhoukang
> Priority: Major
>
> Currently,the deserializeStream in ExternalAppendOnlyMap#DiskMapIterator init
> when DiskMapIterator instance created.This will cause memory use overhead
> when ExternalAppendOnlyMap spill too much times.
> We can avoid this by making deserializeStream init when it is used the first
> time.
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