Yongjun Zhang created HDFS-10887:
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             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
{code}
"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.
{code}

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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