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https://issues.apache.org/jira/browse/SPARK-23974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16436726#comment-16436726
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Apache Spark commented on SPARK-23974:
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User 'sadhen' has created a pull request for this issue:
https://github.com/apache/spark/pull/21059

> Do not allocate more containers as expected in dynamic allocation
> -----------------------------------------------------------------
>
>                 Key: SPARK-23974
>                 URL: https://issues.apache.org/jira/browse/SPARK-23974
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.1.1
>            Reporter: Darcy Shen
>            Priority: Major
>
> Using Yarn with dynamic allocation enabled, spark does not allocate more 
> containers when current containers(executors) number is less than the max 
> executor num.
> For example, we only have 7 executors working, while our cluster is not busy, 
> and I have set
> {{ spark.dynamicAllocation.maxExecutors = 600}}
> {{and the current jobs of the context are executed slowly.}}



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