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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2291) HA: Checkpointing in an HA setup
Date Sat, 31 Dec 2011 01:57:30 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HDFS-2291:

    Attachment: hdfs-2291.txt

New iteration of the patch handles canceling checkpoints if a failover happens in the middle
of the process.

There is still one very narrow race where the cancellation doesn't work -- but it won't cause
a crash or anything, just a delayed failover. I'd like to address that in a followup since
it wasn't simple to fix.

I took the liberty of refactoring some common configuration code out into a new CheckpointConf
class.. hope that's OK.

I'll probably upload one more rev of this patch with better comments/javadoc, but this should
be ready for general review.
> HA: Checkpointing in an HA setup
> --------------------------------
>                 Key: HDFS-2291
>                 URL: https://issues.apache.org/jira/browse/HDFS-2291
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623)
>         Attachments: hdfs-2291.txt, hdfs-2291.txt
> We obviously need to create checkpoints when HA is enabled. One thought is to use a third,
dedicated checkpointing node in addition to the active and standby nodes. Another option would
be to make the standby capable of also performing the function of checkpointing.

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