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