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https://issues.apache.org/jira/browse/HDFS-5102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741495#comment-13741495
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Aaron T. Myers commented on HDFS-5102:
--------------------------------------
Here's an example of the problem. Note that the snapshot name "/snapshot1"
begins with a "/" character:
{noformat}
[02:13:40] $ sudo -u hdfs -E hadoop fs -mkdir -p /a/b
[02:14:32] $ sudo -u hdfs -E hdfs dfsadmin -allowSnapshot /a
Allowing snaphot on /a succeeded
[02:15:07] $ sudo -u hdfs -E hadoop fs -createSnapshot /a snapshot0
Created snapshot /a/.snapshot/snapshot0
[02:15:30] $ sudo -u hdfs -E hadoop fs -createSnapshot /a /snapshot1
Created snapshot /a/.snapshot/snapshot1
[02:15:39] $ sudo -u hdfs -E hadoop fs -ls /a/.snapshot
Found 2 items
drwxr-xr-x - hdfs supergroup 0 2013-08-15 14:15
/a/.snapshot/snapshot0
drwxr-xr-x - hdfs supergroup 0 2013-08-15 14:15
/a/.snapshot/snapshot1
[02:15:50] $ sudo -u hdfs -E hadoop fs -ls /a/.snapshot/snapshot0
Found 1 items
drwxr-xr-x - hdfs supergroup 0 2013-08-15 14:14
/a/.snapshot/snapshot0/b
[02:15:56] $ sudo -u hdfs -E hadoop fs -ls /a/.snapshot/snapshot1
ls: `/a/.snapshot/snapshot1': No such file or directory
{noformat}
> Snapshot names should not be allowed to contain slash characters
> ----------------------------------------------------------------
>
> Key: HDFS-5102
> URL: https://issues.apache.org/jira/browse/HDFS-5102
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: snapshots
> Affects Versions: 2.1.0-beta
> Reporter: Aaron T. Myers
>
> Snapshots of a snapshottable directory are allowed to have arbitrary names.
> Presently, if you create a snapshot with a snapshot name that begins with a
> "/" character, this will be allowed, but later attempts to access this
> snapshot will fail because of the way the {{Path}} class deals with
> consecutive "/" characters. I suggest we disallow "/" from appearing in
> snapshot names.
> An example of this is in the first comment on this JIRA.
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