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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7487) DF should throw a more reasonable exception when mount cannot be determined
Date Fri, 01 Feb 2013 03:27:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13568428#comment-13568428

Hadoop QA commented on HADOOP-7487:

{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-common-project/hadoop-common.

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

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/2129//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/2129//console

This message is automatically generated.
> DF should throw a more reasonable exception when mount cannot be determined
> ---------------------------------------------------------------------------
>                 Key: HADOOP-7487
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7487
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Andrew Wang
>              Labels: noob
>         Attachments: hadoop-7487-1.patch
> Currently, when using the DF class to determine the mount corresponding to a given directory,
it will throw the generic exception "Expecting a line not the end of stream" if it can't determine
the mount (for example if the directory doesn't exist).
> This error message should be improved in several ways:
> # If the dir to check doesn't exist, we can see that before even execing df, and throw
a better exception (or behave better by chopping path components until it exists)
> # Rather than parsing the lines out of df's stdout, collect the whole output, and then
parse. So, if df returns a non-zero exit code, we can avoid trying to parse the empty result
> # If there's a success exit code, and we still can't parse it (eg incompatible OS), we
should include the unparseable line in the exception message.

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