Shuyan Zhang created HDFS-16939:
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             Summary: Fix the thread safety bug in LowRedundancyBlocks
                 Key: HDFS-16939
                 URL: https://issues.apache.org/jira/browse/HDFS-16939
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namanode
            Reporter: Shuyan Zhang
            Assignee: Shuyan Zhang


The remove method in LowRedundancyBlocks is not protected by synchronized. This 
method is private and is called by BlockManager. As a result, priorityQueues 
has the risk of being accessed concurrently by multiple threads.



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