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https://issues.apache.org/jira/browse/SPARK-10087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-10087:
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Assignee: Apache Spark
> In some cases, all reducers are scheduled to the same executor
> --------------------------------------------------------------
>
> Key: SPARK-10087
> URL: https://issues.apache.org/jira/browse/SPARK-10087
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Affects Versions: 1.5.0
> Reporter: Yin Huai
> Assignee: Apache Spark
> Priority: Critical
>
> In some cases, when spark.shuffle.reduceLocality.enabled is enabled, we are
> scheduling all reducers to the same executor (the cluster has plenty of
> resources). Changing spark.shuffle.reduceLocality.enabled to false resolve
> the problem.
> Here is a little bit more information. For one of my query, all 200 reducers
> were scheduled to the same reducer and every reducer has about 800 KB input.
>
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