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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3042) Automatic failover support for NN HA
Date Sun, 20 May 2012 06:32:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279677#comment-13279677
] 

Todd Lipcon commented on HDFS-3042:
-----------------------------------

For future reference, the main design documentation here is attached to HDFS-2185.

Some stats on the proposed merge:
- 1782 new lines of java code
- 1851 new lines of java test code (32 new test cases)
- 261 new lines of doc on the new feature (HDFSHighAvailability.apt.vm)

In terms of testing:
- there are a number of new automated tests in the branch (see above stats). I don't have
coverage stats but my guess is it's >80% on the new code if not higher. I can calculate
if people would like.
- we've also manually tested on clusters, by following the non-automatic HA test plan from
HDFS-1623, but replacing all manual failovers with automatic failovers performed by killing
or stopping one of the NNs.
- we've been running an internal Jenkins instance against a branch with all of the auto-HA
tests applied for several months and it has been stable for several weeks.
                
> Automatic failover support for NN HA
> ------------------------------------
>
>                 Key: HDFS-3042
>                 URL: https://issues.apache.org/jira/browse/HDFS-3042
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: auto-failover, ha
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3042.txt
>
>
> HDFS-1623 was the umbrella task for implementation of NN HA capabilities. However, it
only focused on manually-triggered failover.
> Given that the HDFS-1623 branch will be merged shortly, I'm opening this JIRA to consolidate/track
subtasks for automatic failover support and related improvements.

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