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Posted to issues@spark.apache.org by "Jiang Xingbo (JIRA)" <ji...@apache.org> on 2018/07/27 03:18:00 UTC

[jira] [Created] (SPARK-24941) Add RDDBarrier.coalesce() function

Jiang Xingbo created SPARK-24941:
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             Summary: Add RDDBarrier.coalesce() function
                 Key: SPARK-24941
                 URL: https://issues.apache.org/jira/browse/SPARK-24941
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 3.0.0
            Reporter: Jiang Xingbo


https://github.com/apache/spark/pull/21758#discussion_r204917245

The number of partitions from the input data can be unexpectedly large, eg. if you do
{code}
sc.textFile(...).barrier().mapPartitions()
{code}
The number of input partitions is based on the hdfs input splits. We shall provide a way in RDDBarrier to enable users to specify the number of tasks in a barrier stage. Maybe something like RDDBarrier.coalesce(numPartitions: Int) .



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