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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