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From "Dennis Oberhoff (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2064) Warm HA NameNode going Hot
Date Tue, 02 Aug 2011 15:21:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13076264#comment-13076264
] 

Dennis Oberhoff commented on HDFS-2064:
---------------------------------------

No not yet. Currently you have to start the Node as BackUp Node. This will import the fsimage
to the SBN. After it you have to kill the Node and restart it as Standby. Right now -importCheckpoint
doesn't seem to do the work.Would be nice if this procedure could be implemented into the
Standby Mode. 

> Warm HA NameNode going Hot
> --------------------------
>
>                 Key: HDFS-2064
>                 URL: https://issues.apache.org/jira/browse/HDFS-2064
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>            Priority: Blocker
>         Attachments: WarmHA-GoingHot.pdf, failover-v-0.22.patch
>
>
> This is the design for automatic hot HA for HDFS NameNode. It involves use of HA software
and LoadReplicator - external to Hadoop components, which substantially simplify the architecture
by separating HA- from Hadoop-specific problems. Without the external components it provides
warm standby with manual failover.

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