[jira] [Created] (HBASE-21856) Consider Causal Replication

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

Lars Hofhansl created HBASE-21856:
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             Summary: Consider Causal Replication
                 Key: HBASE-21856
                 URL: https://issues.apache.org/jira/browse/HBASE-21856
             Project: HBase
          Issue Type: Brainstorming
            Reporter: Lars Hofhansl


We've had various effort to improve the ordering guarantees for HBase, most notably Serial Replication.

I think in many cases guaranteeing a Total Replication Order is not required, but a simpler Causal Replication Order is sufficient.
Specifically we would guarantee causal ordering for a single Rowkey. Any changes to a Row - Puts, Deletes, etc) would be replicated in the exact order in which they occurred in the source system.

Unlike total ordering this can be accomplished with only local region server control.

I don't have a full design in mind, let's discuss here. It should be sufficient to to the following:
# RegionServers only adopt the replication queues from other RegionServers for regions they (now) own. This requires log splitting for replication.
# RegionServer ship all edits for queues adopted from other servers before any of their "own" edits are shipped.

It's probably a bit more involved, but should be much cheaper that the total ordering provided by serial replication.



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