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https://issues.apache.org/jira/browse/SPARK-23349?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-23349.
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Resolution: Won't Fix
Fix Version/s: (was: 2.2.1)
> Duplicate and redundant type determination for ShuffleManager Object
> --------------------------------------------------------------------
>
> Key: SPARK-23349
> URL: https://issues.apache.org/jira/browse/SPARK-23349
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, SQL
> Affects Versions: 2.2.1
> Reporter: Phoenix_Daddy
> Priority: Minor
>
> org.apache.spark.sql.execution.exchange.ShuffleExchange
> In the "needtocopyobjectsbeforguffle()" function，there is a nested "if or
> else" branch .
> The <sortBasedShufffleOn> condition in the first layer "if" has the same
> value as the <bypassIsSupported> condition in the second layer "if", that is,
> <bypassIsSupported> must be true when <sortBasedShufffleOn> is true.
> In addition, the <byPassMergeThreshold> condition will be used in the second
> layer "if" and should not be calculated until needed.
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