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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 03:57:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14504269#comment-14504269

Chris Nauroth commented on HDFS-8193:

Hello [~atm] and [~zhz].  HDFS-6186 added the {{dfs.namenode.startup.delay.block.deletion.ms}}
configuration property.  Can you please describe how this new feature is different from that,
and if applicable, how the two are related?  HDFS-6186 only applies at NameNode startup. 
Is the new feature something that could be triggered at any time on a running NameNode, such
as right before a manual HA failover?

> 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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