Shixiong Zhu created SPARK-12101:
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             Summary: 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: 1.5.2, 1.4.1, 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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