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From "Pete Wyckoff (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3485) implement writes
Date Wed, 04 Jun 2008 23:13:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12602497#action_12602497
] 

Pete Wyckoff commented on HADOOP-3485:
--------------------------------------

Good question - the problem is that in some situations, fuse seems to do something more like:

create
release
open
write
flush
release.

So, although we already store the file pointer in the fuse_file_info structure, there's nothing
we can do if fuse tells us to close the file.

And note, the fuse_file_info pointer passed into open doesn't include the original fuse_file_info
data. So, even not closing it on the first release won't help - unless we cached the file
handle ourselves.

If you know how we can get around fuse doing this, it would be very helpful.

-- pete


> 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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