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https://issues.apache.org/jira/browse/SPARK-2648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell resolved SPARK-2648.
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Resolution: Not a Problem
It turns out we already randomized these, just in a different part of the code.
> Randomize order of executors when fetching shuffle blocks
> ---------------------------------------------------------
>
> Key: SPARK-2648
> URL: https://issues.apache.org/jira/browse/SPARK-2648
> Project: Spark
> Issue Type: Improvement
> Reporter: Lianhui Wang
> Assignee: Lianhui Wang
> Priority: Critical
>
> like mapreduce we need to shuffle blocksByAddress.it can avoid many reducers
> to connect a executor at a time.when a map has many paritions, at a time
> there has so much reduces connecting to this map.so it maybe make network's
> connect to timeout.
> i created PR for this issue:https://github.com/apache/spark/pull/1549
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