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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3159) Document NN auto-failover setup and configuration
Date Thu, 12 Apr 2012 20:29:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252798#comment-13252798

Eli Collins commented on HDFS-3159:

Looks good Todd, minor comments:

- Instructions say dfs.ha.automatic-failover.enabled is in core-site.xml, should be hdfs-site.xml
- "notifying the other machines" / "notifying the other NameNode"
- "active node" / "active NameNode"
- "acts as a client of ZooKeeper" -> "is a ZooKeeper client"
- "has a ZKFC running on the same machine" / "has a ZKFC that runs on the same machine as
the NameNode" 
- "special health-check command" / "health-check command"
- Use "local NameNode" instead of "local node" most places, eg to avoid confusion with node
in the ZK sense (eg "lock node")
- "users may refer" / "refer"
- "within 10-20 seconds", worth mentioning "ha.zookeeper.session-timeout.ms" instead of a
raw value

> Document NN auto-failover setup and configuration
> -------------------------------------------------
>                 Key: HDFS-3159
>                 URL: https://issues.apache.org/jira/browse/HDFS-3159
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: auto-failover, documentation, ha
>    Affects Versions: Auto failover (HDFS-3042)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: HDFSHighAvailability.html, hdfs-3159.txt
> We should document how to configure, set up, and monitor an automatic failover setup.
This will require adding the new configs to the *-default.xml and adding prose to the "apt"
docs as well.

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