Yongjun Zhang created HDFS-10887:

             Summary: Provide admin/debug tool to dump block map
                 Key: HDFS-10887
                 URL: https://issues.apache.org/jira/browse/HDFS-10887
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs, namenode
            Reporter: Yongjun Zhang
            Assignee: Yongjun Zhang

>From time to time, when NN restarts, we see
"The reported blocks X needs additional Y blocks to reach the threshold 0.9990 
of total blocks Z. Safe mode will be turned off automatically.

We'd wonder what these blocks that still need block reports are, and what DNs 
they could possibly be located, what happened to these DNs.

This jira to to propose a new admin or debug tool to dump the block map info 
with the blocks that have fewer than minRepl replicas.

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