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https://issues.apache.org/jira/browse/HDFS-8193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14505386#comment-14505386
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Zhe Zhang commented on HDFS-8193:
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bq. If possible, would you please see if there is a way to make the delay
visible through metrics and the web UI?
That's a great point. I believe admins will want to monitor both the delay and
number of pending deletions. Will either add in this JIRA or a follow-on.
bq. Perhaps you could even just populate the same fields that were added in
HDFS-5986 and HDFS-6385.
Seems to me these metrics differ for each DN. Maybe we should add them to the
DN web UI / metrics? We could sum up the number of pending-deletion replicas
and show on NN. But the per-DN delays are hard to summarize.
> 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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