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https://issues.apache.org/jira/browse/SPARK-21474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-21474.
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Resolution: Won't Fix
> 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
> Labels: configuration-addition
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> 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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