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https://issues.apache.org/jira/browse/HBASE-12259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14213735#comment-14213735
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Rishit Shroff commented on HBASE-12259:
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[~stack], No. The code over in HBASE-12476 is the RAFT Protocol implementation.
The document in this JIRA is about the overall architecture. Please let me know
if you need any information regarding HBASE-12476.
[~tedyu], No. The ACTIVE-WITNESS|SHADOW-WITNESS are both shown as 'Witness' in
the diagram to keep it simple. The ACTIVE follower in the diagram means that:
1. From RAFT protocol perspective, that region server is a FOLLOWER
2. The same region server is the ACTIVE guy for DC-2 and will be doing
flushes/compactions to HDFS. However it does not serve any client traffic.
> Bring quorum based write ahead log into HBase
> ---------------------------------------------
>
> Key: HBASE-12259
> URL: https://issues.apache.org/jira/browse/HBASE-12259
> Project: HBase
> Issue Type: Improvement
> Components: wal
> Affects Versions: 2.0.0
> Reporter: Elliott Clark
> Attachments: Architecture for HydraBase (4).pdf
>
>
> HydraBase (
> https://code.facebook.com/posts/321111638043166/hydrabase-the-evolution-of-hbase-facebook/
> ) Facebook's implementation of HBase with Raft for consensus will be going
> open source shortly. We should pull in the parts of that fb-0.89 based
> implementation, and offer it as a feature in whatever next major release is
> next up. Right now the Hydrabase code base isn't ready to be released into
> the wild; it should be ready soon ( for some definition of soon).
> Since Hydrabase is based upon 0.89 most of the code is not directly
> applicable. So lots of work will probably need to be done in a feature branch
> before a merge vote.
> Is this something that's wanted?
> Is there anything clean up that needs to be done before the log
> implementation is able to be replaced like this?
> What's our story with upgrading to this? Are we ok with requiring down time ?
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