holdenk created SPARK-13186:
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             Summary: Migrate away from SynchronizedMap which is derpecated
                 Key: SPARK-13186
                 URL: https://issues.apache.org/jira/browse/SPARK-13186
             Project: Spark
          Issue Type: Sub-task
            Reporter: holdenk
            Priority: Trivial


The warning is " trait SynchronizedMap in package mutable is deprecated: 
Synchronization via traits is deprecated as it is inherently unreliable.  
Consider java.util.concurrent.ConcurrentHashMap as an alternative.
[warn]   val failureReasons = new HashMap[Int, String] with 
SynchronizedMap[Int, String]"



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