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https://issues.apache.org/jira/browse/HDFS-8193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561342#comment-14561342
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Zhe Zhang commented on HDFS-8193:
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HDFS-8486 is another use case for the proposed block-level protection.
> 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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