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