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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