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https://issues.apache.org/jira/browse/HDFS-6500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14020856#comment-14020856
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Yongjun Zhang commented on HDFS-6500:
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Good catch Nicholas, thanks.
> Snapshot shouldn't be removed silently after renaming to an existing snapshot
> -----------------------------------------------------------------------------
>
> Key: HDFS-6500
> URL: https://issues.apache.org/jira/browse/HDFS-6500
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: snapshots
> Affects Versions: 2.4.0
> Reporter: Junping Du
> Assignee: Tsz Wo Nicholas Sze
> Priority: Blocker
> Attachments: h6500_20140607.patch
>
>
> Assume you have two snapshots for /dir: s1, s2, when you do "hdfs dfs
> -renameSnapshot /dir s2 s1" which means you want to rename s2 to s1. It will
> cause s2 been dropped silently and s1 still keep the previous one. This is
> very confusing and easily cause wrong operation.
> The right behavior should be providing a warning to remind user that the
> target name is already existed and do nothing. If user do want to overlap s1,
> he should add some option (i.e. "-f") or delete s1 first.
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