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From "Stephen Chu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4868) Clean up error message when trying to snapshot using ViewFileSystem
Date Sun, 08 Dec 2013 02:59:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13842378#comment-13842378

Stephen Chu commented on HDFS-4868:

Hey, [~cnauroth]. Sounds good, feel free to close as Won't Fix. Thanks!

> 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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