Vinayakumar B created HDFS-13027:
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             Summary: Handle NPE due to deleted blocks in race condition
                 Key: HDFS-13027
                 URL: https://issues.apache.org/jira/browse/HDFS-13027
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
            Reporter: Vinayakumar B


Since File deletions and Block removal from BlocksMap done in separate locks, 
there are possibilities of NPE due to calls of 
{{blockManager.getBlockCollection(block)}} returning null.

Handle all possibilities of NPEs due to this.



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