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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3485) implement writes
Date Wed, 11 Jun 2008 18:10:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604293#action_12604293
] 

Hong Tang commented on HADOOP-3485:
-----------------------------------

Why would you consider it a hack? Well, maybe true in the sense that writing FUSE for HDFS
is a hack because you will never be able to perform random writes.

In any case, my take is that by not depending on appending, the FUSE-based mounter can be
used in current and older versions of HDFS, which benefits users who prefer hold-and-wait
when some new things come out.

BTW, I do not believe this should be a major effort, and I am reasonably comfortable to say
this because my old company has an internal product very similar to HDFS and we got it working
with FUSE flawlessly.

-Hong

> 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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