Mridul Muralidharan created SPARK-6166:
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Summary: Add config to limit number of concurrent outbound
connections for shuffle fetch
Key: SPARK-6166
URL: https://issues.apache.org/jira/browse/SPARK-6166
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 1.4.0
Reporter: Mridul Muralidharan
spark.reducer.maxMbInFlight puts a bound on the in flight data in terms of size.
But this is not always sufficient : when the number of hosts in the cluster
increase, this can lead to very large number of in-bound connections to one
more nodes - causing workers to fail under the load.
I propose we also add a spark.reducer.maxReqsInFlight - which puts a bound on
number of outstanding outbound connections.
This might still cause hotspots in the cluster, but in our tests this has
significantly reduced the occurance of worker failures.
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