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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4140) fuse-dfs handles open(O_TRUNC) poorly
Date Fri, 09 Nov 2012 03:38:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493713#comment-13493713

Hadoop QA commented on HDFS-4140:

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3470//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3470//console

This message is automatically generated.
> 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
> 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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