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https://issues.apache.org/jira/browse/SPARK-9858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049139#comment-15049139
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Yin Huai commented on SPARK-9858:
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My understanding is that every task should get a new instance of the shuffle
serializer (SparkSqlSerializer or UnsafeRowSerializer). So, we should not need
to worry about the thread safety issue of the serializer. It will be good to
confirm it with the identify hash code. Can you do it?
> Introduce an ExchangeCoordinator to estimate the number of post-shuffle
> partitions.
> -----------------------------------------------------------------------------------
>
> Key: SPARK-9858
> URL: https://issues.apache.org/jira/browse/SPARK-9858
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
> Fix For: 1.6.0
>
>
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