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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2991) failure to load edits: ClassCastException
Date Thu, 23 Feb 2012 04:55:48 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HDFS-2991:

    Attachment: hdfs-2991.txt

Attached patch fixes the issue and adds two tests. The first verifies that the underlying
issue is fixed (ie that OP_ADD is always logged when the file is re-opened). The second verifies
that we can continue to read the "broken" logs generated by prior versions. It depends on
the attached tarball which goes in src/test/resources -- this tarball was created as described
above using 0.23.1-rc2 (which displays the bug).

I also set up the workaround code so that, if  future versions have an issue like this, we'll
throw the exception (ie the workaround only runs for known buggy versions). I didn't bump
the log version, though, since the format itself has not changed.
> failure to load edits: ClassCastException
> -----------------------------------------
>                 Key: HDFS-2991
>                 URL: https://issues.apache.org/jira/browse/HDFS-2991
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.24.0, 0.23.1
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>         Attachments: hdfs-2991.txt, image-with-buggy-append.tgz
> In doing scale testing of trunk at r1291606, I hit the following:
> java.io.IOException: Error replaying edit log at offset 1354251
> Recent opcode offsets: 1350014 1350176 1350312 1354251
>         at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:418)
>         at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:93)
>         at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:79)
> ...
> Caused by: java.lang.ClassCastException: org.apache.hadoop.hdfs.server.namenode.INodeFile
cannot be cast to org.apache.hadoop.hdfs.server.namenode.INodeFileUnderConstruction
>         at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:213)
>         ... 13 more

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