[jira] [Commented] (HDFS-4868) Clean up error message when trying to snapshot using ViewFileSystem

["Chris Nauroth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-4868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13842091#comment-13842091 ] 

Chris Nauroth commented on HDFS-4868:
-------------------------------------

Hi, [~schu].  I think we ought to support the snapshot methods through {{ViewFileSystem}}, so I filed HDFS-5641 for adding that support.  Considering that, do you think we can close out HDFS-4868 as Won't Fix?

> Clean up error message when trying to snapshot using ViewFileSystem
> -------------------------------------------------------------------
>
>                 Key: HDFS-4868
>                 URL: https://issues.apache.org/jira/browse/HDFS-4868
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: snapshots
>    Affects Versions: 3.0.0
>            Reporter: Stephen Chu
>            Priority: Minor
>
> Snapshots aren't supported for the ViewFileSystem. When users try to create a snapshot, they'll run into a message like the following:
> {code}
> schu-mbp:presentation schu$ hadoop fs -createSnapshot /user/schu
> -createSnapshot: Fatal internal error
> java.lang.UnsupportedOperationException: ViewFileSystem doesn't support createSnapshot
> 	at org.apache.hadoop.fs.FileSystem.createSnapshot(FileSystem.java:2285)
> 	at org.apache.hadoop.fs.shell.SnapshotCommands$CreateSnapshot.processArguments(SnapshotCommands.java:87)
> 	at org.apache.hadoop.fs.shell.Command.processRawArguments(Command.java:194)
> 	at org.apache.hadoop.fs.shell.Command.run(Command.java:155)
> 	at org.apache.hadoop.fs.FsShell.run(FsShell.java:255)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
> 	at org.apache.hadoop.fs.FsShell.main(FsShell.java:305)
> {code}
> To make things more readable and avoid confusion, it would be helpful to clean up the error message stacktrace and just state that ViewFileSystem doesn't support createSnapshot, similar to what was done in HDFS-4846. The "fatal internal error" message is a bit scary and it might be useful to remove that message to avoid confusion from operators.



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