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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