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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4956) DistributedFileSystem does not handle CreateFlag.APPEND in create call
Date Mon, 08 Jul 2013 22:41:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702551#comment-13702551
] 

Suresh Srinivas commented on HDFS-4956:
---------------------------------------

bq. yes, It seems only fix in DistributedFileSystem and DFSClient, because FSNamesystem has
been considered it.
I am not sure what you mean here. Assuming what you mean is, DFSClient and DistributedFileSystem
does not handle it and FSNamesystem handles it, the right way to do this is DistributedFileSystem/DFSClient
should call append or create based on the flags passed to them. Currently FSNamesystem has
code that makes it look like it handles it. However there are some differences between append
method and create. For example, create does not check if append feature is supported. It also
cannot return LocatedBlock with last incomplete block. The FSNamesystem implementation is
incorrect and incomplete.
                
> DistributedFileSystem does not handle CreateFlag.APPEND in create call
> ----------------------------------------------------------------------
>
>                 Key: HDFS-4956
>                 URL: https://issues.apache.org/jira/browse/HDFS-4956
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Suresh Srinivas
>
> Currently DistributedFileSystem does not handle CreateFlag.APPEND in the implementation
of FileSystem#create() method. It only support OVERWRITE & CREATE or just CREATE.

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