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From "Pete Wyckoff (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4616) assertion makes fuse-dfs exit when reading incomplete data
Date Sat, 08 Nov 2008 04:20:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pete Wyckoff updated HADOOP-4616:
---------------------------------

        Fix Version/s: 0.20.0
                       0.19.1
                       0.18.3
             Assignee: Pete Wyckoff
    Affects Version/s:     (was: 0.20.0)
                       0.18.2
               Status: Patch Available  (was: Open)

fixed by handling this case of the read immediately resulting in EOF with no bytes read.



> 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
>
>
> 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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