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

["Todd Lipcon (JIRA)" <ji...@apache.org>]

Add read-only region replicas (slaves) for availability and fast region recovery
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                 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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