hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4616) assertion makes fuse-dfs exit when reading incomplete data
Date Fri, 21 Nov 2008 00:16:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649553#action_12649553

dhruba borthakur commented on HADOOP-4616:

This patch introduces a debug print into stderr in libhdfs:

+            if (noReadBytes == 0 || noReadBytes < -1) {
+              fprintf(stderr, "WARN: FSDataInputStream.read returned invalid return code
- libhdfs returning EOF, i.e., 0: %d\n", noReadBytes);
+            }

I am fine with it but would like to poll the user-community to see if this could break any
application that is currently using libhdfs.

> 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: Blocker
>             Fix For: 0.18.3, 0.19.1, 0.20.0
>         Attachments: HADOOP-4616.txt, HADOOP-4616.txt, HADOOP-4616.txt, HADOOP-4616_0.18.2.txt,
HADOOP-4616_0.18.2.txt, HADOOP-4616_0.19.txt, HADOOP-4616_0.19.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.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message