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From "Reynold Xin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-3135) Avoid memory copy in TorrentBroadcast serialization
Date Sat, 18 Oct 2014 04:01:33 GMT

    [ https://issues.apache.org/jira/browse/SPARK-3135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14175838#comment-14175838
] 

Reynold Xin commented on SPARK-3135:
------------------------------------

Is the memory usage lower on the master branch vs 1.1? If yes, we can certainly backport.
This is a medium size fix.

> Avoid memory copy in TorrentBroadcast serialization
> ---------------------------------------------------
>
>                 Key: SPARK-3135
>                 URL: https://issues.apache.org/jira/browse/SPARK-3135
>             Project: Spark
>          Issue Type: Sub-task
>            Reporter: Reynold Xin
>            Assignee: Reynold Xin
>              Labels: starter
>             Fix For: 1.2.0
>
>
> TorrentBroadcast.blockifyObject uses a ByteArrayOutputStream to serialize broadcast object
into a single giant byte array, and then separates it into smaller chunks.  We should implement
a new OutputStream that writes serialized bytes directly into chunks of byte arrays so we
don't need the extra memory copy.



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