Raajay Viswanathan created SPARK-21474:
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Summary: Make number of parallel fetches from a reducer
configurable
Key: SPARK-21474
URL: https://issues.apache.org/jira/browse/SPARK-21474
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.2.0
Reporter: Raajay Viswanathan
Priority: Minor
Currently the number of parallel fetches is hard-coded to 5. As a result the
size of each fetch request is fixed at 1/5th of maxSizeInFlights. Since, chunks
are requested in bursts of fetchRequests; the size of a burst to a single
shuffle service can be high for large maxSizeInFlight
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