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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2010) Clean up and test behavior under failed edit streams
Date Wed, 29 Jun 2011 21:32:28 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Aaron T. Myers updated HDFS-2010:

    Attachment: hdfs-2010.2.patch

Here's a patch which addresses the feedback given so far.

@Todd: Thanks a lot for the review. I've incorporated all of your comments.

@Matt: Thanks for the review. Great catch! I've fixed the check and added a test case to exercise
this scenario. I've also renamed "{{stillGoodJournals}}" to "{{candidateJournals}}", which
seems to me to be sufficiently descriptive but less verbose than "{{candidateJournalsToSync}}".

> Clean up and test behavior under failed edit streams
> ----------------------------------------------------
>                 Key: HDFS-2010
>                 URL: https://issues.apache.org/jira/browse/HDFS-2010
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Edit log branch (HDFS-1073)
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>             Fix For: Edit log branch (HDFS-1073)
>         Attachments: hdfs-2010.0.patch, hdfs-2010.1.patch, hdfs-2010.2.patch
> Right now there is very little test coverage of situations where one or more of the edits
directories fails. In trunk, the behavior when all of the edits directories are dead is that
the NN prints a fatal level log message and calls Runtime.exit(-1).
> I don't think this is really the behavior we want. Needs a bit of thought, but I think
something like the following would make more sense:
> - any calls currently waiting on logSync should end up throwing an exception
> - NN should probably enter safe mode
> - ops can restore edits directories and then ask the NN to restore storage, at which
point it could edit safemode
> - alternatively, ops could call ask the NN to do saveNamespace and then shut it down

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