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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6289) HA failover can fail if there are pending DN messages for DNs which no longer exist
Date Tue, 29 Apr 2014 01:12:21 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Aaron T. Myers updated HDFS-6289:

    Attachment: HDFS-6289.patch

You're right, should probably take care of this separately. I only incidentally discovered
it while looking into this issue, but it really is a separate bug. I'll file another JIRA
once this one's committed.

Latest patch makes the TODO more clear when read out of context, and addresses Yongjun's feedback.

Todd, this look OK to you?

> HA failover can fail if there are pending DN messages for DNs which no longer exist
> -----------------------------------------------------------------------------------
>                 Key: HDFS-6289
>                 URL: https://issues.apache.org/jira/browse/HDFS-6289
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.4.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>            Priority: Critical
>         Attachments: HDFS-6289.patch, HDFS-6289.patch
> In an HA setup, the standby NN may receive messages from DNs for blocks which the standby
NN is not yet aware of. It queues up these messages and replays them when it next reads from
the edit log or fails over. On a failover, all of these pending DN messages must be processed
successfully in order for the failover to succeed. If one of these pending DN messages refers
to a DN storageId that no longer exists (because the DN with that transfer address has been
reformatted and has re-registered with the same transfer address) then on transition to active
the NN will not be able to process this DN message and will suicide with an error like the
> {noformat}
> 2014-04-25 14:23:17,922 FATAL namenode.NameNode (NameNode.java:doImmediateShutdown(1525))
- Error encountered requiring NN shutdown. Shutting down immediately.
> java.io.IOException: Cannot mark blk_1073741825_900(stored=blk_1073741825_1001) as corrupt
because datanode does not exist
> {noformat}

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