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From ankits <>
Subject Imbalanced shuffle read
Date Wed, 12 Nov 2014 01:15:21 GMT
Im running a job that uses groupByKey(), so it generates a lot of shuffle
data. Then it processes this and writes files to HDFS in a forEachPartition
block. Looking at the forEachPartition stage details in the web console, all
but one executor is idle (SUCCESS in 50-60ms), and one is RUNNING with a
huge shuffle read and takes a long time to finish. 

Can someone explain why the read is all on one node and how to parallelize
this better? 

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