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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 Tue, 28 Jun 2011 20:18:17 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-2010.1.patch

Here's a version of this patch which implements the old behavior of calling {{Runtime.exit(...)}}
on failure to sync any journal. I suggest we do this for now, and consider implementing the
"enter safemode on journal error" feature after the HDFS-1073 branch has been merged back
into trunk.

> 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
>
>
> 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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