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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-2389) Send writes to stable replicas when replicate-on-write is disabled during bootstrap
Date Fri, 25 Mar 2011 21:28:06 GMT
Send writes to stable replicas when replicate-on-write is disabled during bootstrap
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                 Key: CASSANDRA-2389
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2389
             Project: Cassandra
          Issue Type: Bug
            Reporter: Stu Hood


During bootstrap with replicate-on-write disabled, our previous approach of widening the replica
set via TokenMetadata.getWriteEndpoints is not the correct approach. Instead, since a write
is not immediately bound for all replicas, it needs to be sent to a replica that isn't joining
or leaving the replica set due to bootstrap.

Example: with rf=3, 4 nodes are active in a particular replica set: 1 is joining the set,
1 is leaving the set, and 2 are stable in the set (not affected by the bootstrap). The 2 stable
nodes are the ones to which it is "safe" to send un-replicated writes during the bootstrap.

Note that running without replicate-on-write enabled is _never_ recommended, but while the
setting exists, we should do the right thing.

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