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https://issues.apache.org/jira/browse/SPARK-2648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14075719#comment-14075719
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Patrick Wendell commented on SPARK-2648:
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I was looking more at the current code. From what I can tell we already
randomize the order when we are making fetch requests:
https://github.com/apache/spark/blob/9564f8548917f563930d5e87911a304bf206d26e/core/src/main/scala/org/apache/spark/storage/BlockFetcherIterator.scala#L220
> 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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