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https://issues.apache.org/jira/browse/HDFS-10887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yongjun Zhang updated HDFS-10887:
---------------------------------
    Status: Patch Available  (was: Open)

> 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
>         Attachments: HDFS-10887.001.patch
>
>
> 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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