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From "Chuang Liu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3485) implement writes
Date Wed, 04 Jun 2008 18:36:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12602398#action_12602398
] 

Chuang Liu commented on HADOOP-3485:
------------------------------------

Hi: 

Is it possible to use struct fuse_file_info * to pass file handler created in fuse 'create'
call to the following I/O calls like FUSE "write"? In this way, you do not need close the
file in fuse "create()" and reopen it in the following fuse "write()" call.    

For example, for a linux 'cp' command, The fuse call sequence is like the following: 
  static int create (const char *, mode_t, struct fuse_file_info *) ; 
  static int write (const char *, const char *, size_t, off_t,struct fuse_file_info *)
  static int flush(...)
  static int release(...)

The data in struct fuse_file_info* is passed along the call sequence. Therefore, we could
use it to store hadoop file handler or whatever info needed for following I/O info. Thanks.


Chuang 

> implement writes
> ----------------
>
>                 Key: HADOOP-3485
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3485
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: contrib/fuse-dfs
>            Reporter: Pete Wyckoff
>            Priority: Minor
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> Doesn't support writes because fuse protocol first creates the file then closes it and
re-opens it to start writing to it. So, (until hadoop-1700), we need a work around.
> One way to do this is to open the file with overwrite flag on the second open. For security,
would only want to do this for zero length files (could even check the creation ts too, but
because of clock skew, that may be harder).
> Doug, Craig, Nicholas - Comments?
> -- pete
> ps since mostly already implemented, this should be a very quick patch

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