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[SPARK-16941] Use concurrentHashMap instead of scala Map in SparkSQLO…
…perationManager. ## What changes were proposed in this pull request? ThriftServer will have some thread-safe problem in **SparkSQLOperationManager**. Add a SynchronizedMap trait for the maps in it to avoid this problem. Details in [SPARK-16941](https://issues.apache.org/jira/browse/SPARK-16941) ## How was this patch tested? NA Author: huangzhaowei <carlmartinmax@gmail.com> Closes #14534 from SaintBacchus/SPARK-16941.
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