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https://issues.apache.org/jira/browse/HDFS-3092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244521#comment-13244521
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Todd Lipcon commented on HDFS-3092:
-----------------------------------
bq. Right now I see a 3K+ line patch in HDFS-3077. Posting such a huge patch
makes review, code reuse etc. difficult.
I agree. But when I post work piecemeal, I get complaints that it's hard to see
the overall direction of the work. So not sure how to satisfy folks... Given
this is all new code, and a lot of it is tests and "protobuf translators", it's
actually not too bad.
If you will agree to review the pieces as they come in, I'm happy to split
HDFS-3077 into several patches. But if no one is signing up to review the
pieces, splitting it up just slows down progress in my experience.
> Enable journal protocol based editlog streaming for standby namenode
> --------------------------------------------------------------------
>
> Key: HDFS-3092
> URL: https://issues.apache.org/jira/browse/HDFS-3092
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: ha, name-node
> Affects Versions: 0.24.0, 0.23.3
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: MultipleSharedJournals.pdf
>
>
> Currently standby namenode relies on reading shared editlogs to stay current
> with the active namenode, for namespace changes. BackupNode used streaming
> edits from active namenode for doing the same. This jira is to explore using
> journal protocol based editlog streams for the standby namenode. A daemon in
> standby will get the editlogs from the active and write it to local edits. To
> begin with, the existing standby mechanism of reading from a file, will
> continue to be used, instead of from shared edits, from the local edits.
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