[jira] Commented: (HBASE-2357) Coprocessors: Add read-only region replicas (slaves) for availability and fast region recovery

["Andrew Purtell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988508#action_12988508 ] 

Andrew Purtell commented on HBASE-2357:
---------------------------------------

I just committed to doing this (eventually) up on Quora so I guess I better own it.

> Coprocessors: 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: HBase
>          Issue Type: Sub-task
>          Components: master, regionserver
>            Reporter: Todd Lipcon
>            Assignee: Andrew Purtell
>
> 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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