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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4140) fuse-dfs handles open(O_TRUNC) poorly
Date Fri, 14 Dec 2012 02:54:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-4140:
---------------------------------------

    Attachment: HDFS-4140.008.patch

add special case for using WRONLY on 0-length files
                
> fuse-dfs handles open(O_TRUNC) poorly
> -------------------------------------
>
>                 Key: HDFS-4140
>                 URL: https://issues.apache.org/jira/browse/HDFS-4140
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: fuse-dfs
>    Affects Versions: 2.0.2-alpha
>            Reporter: Andy Isaacson
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-4140.003.patch, HDFS-4140.004.patch, HDFS-4140.005.patch, HDFS-4140.006.patch,
HDFS-4140.007.patch, HDFS-4140.008.patch
>
>
> fuse-dfs handles open(O_TRUNC) poorly.
> It is converted to multiple fuse operations.  Those multiple fuse operations often fail
(for example, calling fuse_truncate_impl() while a file is also open for write results in
a "multiple writers!" exception.)
> One easy way to see the problem is to run the following sequence of shell commands:
> {noformat}
> ubuntu@ubu-cdh-0:~$ echo foo > /export/hdfs/tmp/a/t1.txt
> ubuntu@ubu-cdh-0:~$ ls -l /export/hdfs/tmp/a
> total 0
> -rw-r--r-- 1 ubuntu hadoop 4 Nov  1 15:21 t1.txt
> ubuntu@ubu-cdh-0:~$ hdfs dfs -ls /tmp/a
> Found 1 items
> -rw-r--r--   3 ubuntu hadoop          4 2012-11-01 15:21 /tmp/a/t1.txt
> ubuntu@ubu-cdh-0:~$ echo bar > /export/hdfs/tmp/a/t1.txt
> ubuntu@ubu-cdh-0:~$ ls -l /export/hdfs/tmp/a
> total 0
> -rw-r--r-- 1 ubuntu hadoop 0 Nov  1 15:22 t1.txt
> ubuntu@ubu-cdh-0:~$ hdfs dfs -ls /tmp/a
> Found 1 items
> -rw-r--r--   3 ubuntu hadoop          0 2012-11-01 15:22 /tmp/a/t1.txt
> {noformat}

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