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https://issues.apache.org/jira/browse/HDFS-6745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170203#comment-14170203
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Ming Ma commented on HDFS-6745:
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At RPC layer, we can add a new method similar to
ClientProtocol.listCorruptFileBlocks. Maybe the new method can take replication
threshold as a parameter to retrieve all blocks below that threshold. Then
ClientProtocol.listCorruptFileBlocks could become a special case of the new
method.
> Display the list of "very-under-replicated blocks" as well as the files on NN
> webUI
> -----------------------------------------------------------------------------------
>
> Key: HDFS-6745
> URL: https://issues.apache.org/jira/browse/HDFS-6745
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ming Ma
>
> Sometimes admins want to know the list of "very-under-replicated blocks"
> before major actions such as decommission; as these blocks are more likely to
> turn into missing blocks. "very-under-replicated blocks" are those blocks
> with live replica count of 1 and replicator factor of >= 3.
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