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https://issues.apache.org/jira/browse/HBASE-2357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850591#action_12850591
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Andrew Purtell commented on HBASE-2357:
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Minor clarification
bq. But with a consensus protocol, read load can be spread as is the intent of
this issue and yet the data is still strongly consistent
_at any time on any region server hosting the region (or a replica)_
so an ICV is atomic no matter what region server any client is talking to, for
example.
> Add read-only region replicas (slaves) for availability and fast region
> recovery
> --------------------------------------------------------------------------------
>
> Key: HBASE-2357
> URL: https://issues.apache.org/jira/browse/HBASE-2357
> Project: Hadoop HBase
> Issue Type: New Feature
> Components: master, regionserver
> Reporter: Todd Lipcon
>
> I dont plan on working on this in the short term, but the idea is to extend
> region ownership to have two modes. Each region has one primary region server
> and N slave region servers. The slaves would follow the master (probably by
> streaming the relevant HLog entries directly from it) and be able to serve
> stale reads. The benefit is twofold: (a) provides the ability to spread read
> load, (b) enables very fast region failover/rebalance since the memstore is
> already nearly up to date on the slave RS.
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