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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2185) HA: HDFS portion of ZK-based FailoverController
Date Mon, 26 Mar 2012 05:14:47 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-2185:
------------------------------

    Attachment: hdfs-2185.txt

Attached patch is for the HDFS side after splitting out the common components. It includes
a simple unit test which makes sure failover occurs when the NNs shut themselves down.

I'll continue to add test cases and also run some cluster tests while this (and its prereqs
HADOOP-8206 and HADOOP-8212) are under review.
                
> HA: HDFS portion of ZK-based FailoverController
> -----------------------------------------------
>
>                 Key: HDFS-2185
>                 URL: https://issues.apache.org/jira/browse/HDFS-2185
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Todd Lipcon
>         Attachments: Failover_Controller.jpg, hdfs-2185.txt, hdfs-2185.txt
>
>
> This jira is for a ZK-based FailoverController daemon. The FailoverController is a separate
daemon from the NN that does the following:
> * Initiates leader election (via ZK) when necessary
> * Performs health monitoring (aka failure detection)
> * Performs fail-over (standby to active and active to standby transitions)
> * Heartbeats to ensure the liveness
> It should have the same/similar interface as the Linux HA RM to aid pluggability.

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