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From "Feng Honghua (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9469) Synchronous replication
Date Mon, 09 Sep 2013 14:05:52 GMT
Feng Honghua created HBASE-9469:

             Summary: Synchronous replication
                 Key: HBASE-9469
                 URL: https://issues.apache.org/jira/browse/HBASE-9469
             Project: HBase
          Issue Type: New Feature
            Reporter: Feng Honghua
            Priority: Minor


A/B clusters with master-master replication, client writes to A cluster and A pushes all writes
to B cluster, and when A cluster is down, client switches writing to B cluster.

But the client's write switch is unsafe due to the replication between A/B is asynchronous:
a delete to B cluster which aims to delete a put written earlier can fail due to that put
is written to A cluster and isn't successfully pushed to B before A is down. It can be worse
if this delete is collected(flush and then major compact occurs) before A cluster is up and
that put is eventually pushed to B, the put won't ever be deleted.

Can we provide per-table/per-peer synchronous replication which ships the according hlog entry
of write before responsing write success to client? By this we can guarantee the client that
all write requests for which he got success response when he wrote to A cluster must already
have been in B cluster as well.

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