[jira] [Created] (SPARK-26542) Support the coordinator to demerminte post-shuffle partitions more reasonably

["chenliang (JIRA)" <ji...@apache.org>]

chenliang created SPARK-26542:
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             Summary: Support the coordinator to demerminte post-shuffle partitions more reasonably
                 Key: SPARK-26542
                 URL: https://issues.apache.org/jira/browse/SPARK-26542
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.3.2, 2.3.1, 2.3.0, 2.2.2, 2.2.1, 2.2.0
            Reporter: chenliang
             Fix For: 2.3.0


For SparkSQL ,when we  open AE by 'set spark.sql.adapative.enable=true'，the ExchangeCoordinator will  introduced to determine the number of post-shuffle partitions. But in some certain conditions,the coordinator performed not very well, there are always some tasks retained and they worked with Shuffle Read Size / Records  0.0B/0 ,We could increase the spark.sql.adaptive.shuffle.targetPostShuffleInputSize to solve this,but  this action is  unreasonable as targetPostShuffleInputSize Should not be set too large. 




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