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https://issues.apache.org/jira/browse/HDFS-8193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14505402#comment-14505402
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Chris Nauroth commented on HDFS-8193:
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bq. Seems to me these metrics differ for each DN.
Ah yes, I missed the point that you were aiming for per-DN granularity. In
that case, yes, DN metrics would make sense. You also could potentially take
the approach done in HDFS-7604 to publish the counters back to the NN in
heartbeats, and that would enable the NameNode to display per-DN stats on the
Datanodes tab. It's probably worth doing a quick UI mock-up to check if that
really makes sense though. Those tables can get crowded quickly. :-)
Thanks again.
> Add the ability to delay replica deletion for a period of time
> --------------------------------------------------------------
>
> Key: HDFS-8193
> URL: https://issues.apache.org/jira/browse/HDFS-8193
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: namenode
> Affects Versions: 2.7.0
> Reporter: Aaron T. Myers
> Assignee: Zhe Zhang
>
> When doing maintenance on an HDFS cluster, users may be concerned about the
> possibility of administrative mistakes or software bugs deleting replicas of
> blocks that cannot easily be restored. It would be handy if HDFS could be
> made to optionally not delete any replicas for a configurable period of time.
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