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https://issues.apache.org/jira/browse/SPARK-1956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14125027#comment-14125027
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Mridul Muralidharan commented on SPARK-1956:
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The recent changes to BlockObjectWriter have introduced bugs again ... I don't
know how badly they affect the codebase, but it would not be prudent to enable
it by default until they are fixed and changes properly analyzed.
> Enable shuffle consolidation by default
> ---------------------------------------
>
> Key: SPARK-1956
> URL: https://issues.apache.org/jira/browse/SPARK-1956
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, Spark Core
> Affects Versions: 1.0.0
> Reporter: Sandy Ryza
>
> The only drawbacks are on ext3, and most everyone has ext4 at this point. I
> think it's better to aim the default at the common case.
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