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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-717) Proposal for exceptions thrown by FileContext and Abstract File System
Date Mon, 02 Nov 2009 23:42:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772757#action_12772757
] 

Konstantin Shvachko commented on HDFS-717:
------------------------------------------

# What is FileSystemException? If it is java.nio.file.FileSystemException then it will appear
only in java 7.
# What is IsDirectoryException? Sounds more like a method name.
# Should QuotaExceededException be a subclass of IOException, same as AccessDeniedException?
# Do you plan to unwrap ALL RemoteExceptions in DFSClient? Currently we unwrap only a few
exception, while others are still thrown as RemoteException. I think we should not see RemoteException
anywhere in FileContext or AbstractFS.



> 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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