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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4868) Clean up error message when trying to snapshot using ViewFileSystem
Date Fri, 15 May 2015 06:06:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14544986#comment-14544986

Rakesh R commented on HDFS-4868:

[~cnauroth] shall we close this jira as we have done the necessary changes to support snapshot
methods in {{ViewFileSystem}}.

> 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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