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https://issues.apache.org/jira/browse/SPARK-22537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-22537:
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Assignee: Apache Spark
> Aggregation of map output statistics on driver faces single point bottleneck
> ----------------------------------------------------------------------------
>
> Key: SPARK-22537
> URL: https://issues.apache.org/jira/browse/SPARK-22537
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.2.0
> Reporter: Chenzhao Guo
> Assignee: Apache Spark
>
> In adaptive execution, the map output statistics of all mappers will be
> aggregated after a stage is successfully executed. Driver takes the
> aggregation job while it will get slow when the number of mapper * shuffle
> partitions is large.
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