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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4616) assertion makes fuse-dfs exit when reading incomplete data
Date Tue, 11 Nov 2008 11:46:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646530#action_12646530
] 

Hadoop QA commented on HADOOP-4616:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12393676/HADOOP-4616.txt
  against trunk revision 712962.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    -1 javac.  The applied patch generated 220 javac compiler warnings (more than the trunk's
current 1011 warnings).

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3575/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3575/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3575/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3575/console

This message is automatically generated.

> assertion makes fuse-dfs exit when reading incomplete data
> ----------------------------------------------------------
>
>                 Key: HADOOP-4616
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4616
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/fuse-dfs
>    Affects Versions: 0.18.2
>            Reporter: Marc-Olivier Fleury
>            Assignee: Pete Wyckoff
>            Priority: Minor
>             Fix For: 0.18.3, 0.19.1, 0.20.0
>
>         Attachments: HADOOP-4616.txt, HADOOP-4616.txt, HADOOP-4616.txt
>
>
> When trying to read a file that is corrupt on HDFS (registered by the namenode, but part
of the data is missing on the datanodes), some of the assertions in dfs_read fail, causing
the program to abort. This makes it  impossible to access the mounted partition until it is
mounted again.
> A simple way to reproduce this bug is to remove enough datanodes to have part of the
data missing, and to read each file listed in HDFS.
> this is the assertion that fails (fuse_dfs.c:903) : assert(bufferReadIndex >= 0 &&
bufferReadIndex < fh->bufferSize);
> The expected behaviour would be to return either no file or a corrupt file, but continue
working afterward.
> removing the assertion seems to work for now, but a special behaviour is probably needed
to handle this particular problem correctly.

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