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From Andrew Purtell <apurt...@apache.org>
Subject Re: Region Splitting for moderate amount of daily data - Improve MapReduce Performance
Date Tue, 19 Apr 2011 00:10:38 GMT
> From: Jason Rutherglen <jason.rutherglen@gmail.com>

> Andrew, thanks for the information.  On the surface it looks like
> HBASE-2357 would be using the same mechanism for streaming the WAL
> (except the master slave failover) as HBASE-1295, however HBASE-2357
> seems to imply that's not the case?

It could be done that way, but 2357 has a broader focus right? -- not master-slave only (though
that certainly is an option) but also master-master maintaining the same write/read ordering
as achievable with single-region-location deployment. Not that such ordering is necessarily
required, but the notion is to consider a three way trade off:

  1) Strong consistency over other concerns with single region location deployment

  2) Higher availability with consistency over write latency with read replicas and a ZAB-
or Paxos-serialized write path

  3) Highest availability with lowest latency over other concerns with read replicas updated
best effort from the write path

   - Andy


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