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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4539) Streaming Edits to a Standby Name-Node.
Date Mon, 16 Mar 2009 22:41:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682498#action_12682498
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-4539:
------------------------------------------------

- This is an incompatible change
- Need release notes
- Need to updated DatanodeProtocol version since DatanodeCommand is changed.

> Streaming Edits to a Standby Name-Node.
> ---------------------------------------
>
>                 Key: HADOOP-4539
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4539
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.21.0
>
>         Attachments: BackupNode.patch, BackupNode.patch, BackupNode.patch, BackupNode.patch,
BackupNode.patch, BackupNode.patch, image001.gif, StreamEditsToBN.pdf, StreamEditsToSNN.htm
>
>
> Currently Secondary name-node acts as mere checkpointer.
> Secondary name-node should be transformed into a standby name-node (SNN). 
> The long term goal is to make it a warm standby. 
> The purpose of this issue is to provide real time streaming of edits to SNN so that it
contained the up-to-date namespace state.

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