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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-717) Proposal for exceptions thrown by FileContext and Abstract File System
Date Wed, 04 Nov 2009 02:24:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773353#action_12773353
] 

Tsz Wo (Nicholas), SZE commented on HDFS-717:
---------------------------------------------

>> Throw java.io.InterruptedIOException instead of InterruptedException.
> We thought of InterruptedException to capture interrupts to any thread and not just threads
busy with IO.

Do you mean that a server thread is interrupted by some reason and then the server side InterruptedException
is forwarded to the client?  This sounds like a system problem.

I was considering the case that the a client is waiting for a blocking IO (e.g. waiting for
server reply) and the client thread is interrupted.  In such case, InterruptedIOException
should be used.


> Proposal for exceptions thrown by FileContext and Abstract File System
> ----------------------------------------------------------------------
>
>                 Key: HDFS-717
>                 URL: https://issues.apache.org/jira/browse/HDFS-717
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Jitendra Nath Pandey
>            Assignee: Jitendra Nath Pandey
>             Fix For: 0.22.0
>
>
> Currently the APIs in FileContext throw only IOException. Going forward these APIs will
throw more specific exceptions.
> This jira proposes following hierarchy of exceptions to be thrown by FileContext and
AFS (Abstract File System) classes.
> InterruptedException  (java.lang.InterruptedException)
> IOException
>                 /* Following exceptions extend IOException */
>                 FileNotFoundException
>                 FileAlreadyExistsException
>                 DirectoryNotEmptyException
>                 NotDirectoryException
>                 AccessDeniedException
>                 IsDirectoryException
>                 InvalidPathNameException
>                 
>                 FileSystemException
>                                      /* Following exceptions extend FileSystemException
*/
>                                      FileSystemNotReadyException
>                                      ReadOnlyFileSystemException
>                                      QuotaExceededException
>                                      OutOfSpaceException
>                 RemoteException   (java.rmi.RemoteException)
> Most of the IOExceptions above are caused by invalid user input, while FileSystemException
is thrown when FS is in such a state that the requested operation cannot proceed.
> Please note that the proposed RemoteException is from standard java rmi package, which
also extends IOException.
>                             
> HDFS throws many exceptions which are not in the above list. The DFSClient will unwrap
the exceptions thrown by HDFS, and any exception not in the above list will be thrown as IOException
or FileSystemException.

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