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https://issues.apache.org/jira/browse/SPARK-12101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15036487#comment-15036487
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Sean Owen commented on SPARK-12101:
-----------------------------------
To cut down the noise, if this is logically the same issue as one you recently
fixed, they should be attached to one JIRA. That is, someone who gets your
first fix wants the second one; they aren't really separable.
> Fix thread pools that cannot cache tasks in Worker and AppClient
> ----------------------------------------------------------------
>
> Key: SPARK-12101
> URL: https://issues.apache.org/jira/browse/SPARK-12101
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.4.1, 1.5.2, 1.6.0
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
>
> SynchronousQueue cannot cache any task. This issue is similar to SPARK-11999.
> It's an easy fix. Just use the fixed ThreadUtils.newDaemonCachedThreadPool.
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