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https://issues.apache.org/jira/browse/HDFS-8193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14539355#comment-14539355
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Zhe Zhang commented on HDFS-8193:
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bq. I have seen many customers running at 90% plus and scrambling to find
unnecessary files and deleting them to free up space.
Thanks for the insights Suresh! I agree cases like this are fundamentally hard
to handle with trash-based safety methods (this is also a good motivation for
erasure coding :) ). I think an empirical study of production clusters should
help decide the effectiveness of this proposed feature. I will try to collect
some simple usage data first.
> 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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