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From "Wenchen Fan (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-23129) Lazy init DiskMapIterator#deserializeStream to reduce memory usage when ExternalAppendOnlyMap spill too much times
Date Thu, 25 Jan 2018 07:27:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-23129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wenchen Fan resolved SPARK-23129.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

Issue resolved by pull request 20292
[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
>            Assignee: zhoukang
>            Priority: Major
>             Fix For: 2.3.0
>
>
> 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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