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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10887) Provide admin/debug tool to dump block map
Date Thu, 22 Sep 2016 06:44:20 GMT
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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