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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3800) QJM: improvements to QJM fault testing
Date Tue, 14 Aug 2012 01:13:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HDFS-3800:

    Attachment: hdfs-3800.txt

This patch applies on top of the following other staged patches:

pick fac7f15 HDFS-3796. Allow EditLogFileOutputStream to skip fsync() in tests
pick 5a18397 HDFS-3765. initializeSharedEdits 
pick 85978e7 HDFS-3793. Implement format() for QJM
pick 4fc442e HDFS-3795. Validate journal dir at startup
pick f2da880 HDFS-3798. Avoid throwing NPE if finalizeLogSegment() is called on an invalid
pick b0d1a3d HDFS-3799. deal with empty files in recovery path
pick d792847 HDFS-3797. Make journal() call take segmentTxId as parameter

The new randomized test requires a few more patches on top before it passes reliably. However,
I'd like to check it in and then get it passing reliably in follow-up JIRAs.
> QJM: improvements to QJM fault testing
> --------------------------------------
>                 Key: HDFS-3800
>                 URL: https://issues.apache.org/jira/browse/HDFS-3800
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3800.txt
> This JIRA improves TestQJMWithFaults as follows:
> - the current implementation didn't properly unwrap exceptions thrown by the reflection-based
injection method. This caused some issues in the code where the injecting proxy didn't act
quite like the original object.
> - the current implementation incorrectly assumed that the recovery process would recover
to _exactly_ the last acked sequence number. In fact, it may recover to that transaction _or
any greater transaction_.
> It also adds a new randomized test which uncovered a number of other bugs. I will defer
to the included javadoc for a description of this test.

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