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https://issues.apache.org/jira/browse/HADOOP-4539?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Chansler updated HADOOP-4539:
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Release Note: Introduced backup node which maintains the up-to-date state
of the namespace by receiving edits from the namenode, and checkpoint node,
which creates checkpoints of the name space. These facilities replace the
secondary namenode. (was: Introduced Backup node, which maintains an
up-to-date state of the namespace in sync with the name-node.
Introduced Checkpoint node, which creates checkpoints of the namespace state.
This is a replacement for SecondaryNameNode.)
Editorial pass over all release notes prior to publication of 0.21.
> Streaming Edits to a Standby Name-Node.
> ---------------------------------------
>
> Key: HADOOP-4539
> URL: https://issues.apache.org/jira/browse/HADOOP-4539
> Project: Hadoop Common
> Issue Type: New Feature
> 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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