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https://issues.apache.org/jira/browse/HDFS-3998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13468504#comment-13468504
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Steve Loughran commented on HDFS-3998:
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"Block with one replica is still bad" -not so much bad as at exceedingly at
risk, which is why it's almost max priority in the replication queue. Having
some way to view that queue could be a way to see what's happening there
> Speed up fsck
> -------------
>
> Key: HDFS-3998
> URL: https://issues.apache.org/jira/browse/HDFS-3998
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Ming Ma
>
> We have some big clusters. Sometimes we want to find out the list of missing
> blocks or blocks with only one replica quickly. Currently fsck has to take a
> path as input and it then recursively check for inconsistency. That could
> take a long time to find the missing blocks and the files the missing blocks
> belong to. It will be useful to speed this up. For example, it could go
> directly to missing blocks stored in NN and do the file lookup instead.
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