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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