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https://issues.apache.org/jira/browse/HDFS-10887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15518551#comment-15518551
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Yongjun Zhang commented on HDFS-10887:
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Uploaded patch rev 002, replace multiple command options with a single option
mask, and added comprehensive tests.
Thanks [~Lei Xu] for some good discussion.
> 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: New Feature
> Components: hdfs, namenode
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
> Attachments: HDFS-10887.001.patch, HDFS-10887.002.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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