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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8193) Add the ability to delay replica deletion for a period of time
Date Tue, 21 Apr 2015 18:08:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14505402#comment-14505402

Chris Nauroth commented on HDFS-8193:

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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