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https://issues.apache.org/jira/browse/HDFS-12981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466561#comment-16466561
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Xiao Chen commented on HDFS-12981:
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+1 on patch 4, committing
> renameSnapshot a Non-Existent snapshot to itself should throw error
> -------------------------------------------------------------------
>
> Key: HDFS-12981
> URL: https://issues.apache.org/jira/browse/HDFS-12981
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 2.6.0
> Reporter: Sailesh Patel
> Assignee: Kitti Nanasi
> Priority: Minor
> Attachments: HDFS-12981-branch-2.6.0.001.patch,
> HDFS-12981-branch-2.6.0.002.patch, HDFS-12981.001.patch,
> HDFS-12981.002.patch, HDFS-12981.003.patch, HDFS-12981.004.patch
>
>
> When trying to rename a non-existent HDFS snapshot to ITSELF, there are no
> errors and exits with a success code.
> The steps to reproduce this issue is:
> hdfs dfs -mkdir /tmp/dir1
> hdfs dfsadmin -allowSnapshot /tmp/dir1
> hdfs dfs -createSnapshot /tmp/dir1 snap1_dir
> Rename from non-existent to another_non-existent : errors and return code 1.
> This is correct.
> hdfs dfs -renameSnapshot /tmp/dir1 nonexist another_nonexist :
> echo $?
>
> renameSnapshot: The snapshot nonexist does not exist for directory /tmp/dir1
> Rename from non-existent to non-existent : no errors and return code 0
> instead of Error and return code 1.
> hdfs dfs -renameSnapshot /tmp/dir1 nonexist nonexist ; echo $?
> Current behavior: No error and return code 0.
> Expected behavior: An error returned and return code 1.
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