Benedict Elliott Smith created CASSANDRA-17110:
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Summary: CEP-15 (Accord): Transaction outcomes must be replicated
to an optimal number of replicas
Key: CASSANDRA-17110
URL: https://issues.apache.org/jira/browse/CASSANDRA-17110
Project: Cassandra
Issue Type: Sub-task
Components: Accord
Reporter: Benedict Elliott Smith
Transaction outcomes that are defined by the transaction should not be
replicated, and outcomes that are computed from existing records (and as such
were not replicated as part of the original transaction) should only be
replicated to a single primary shard. This complicates execution, however,
without MVCC as the shards from which we had to read the original value cannot
delete their state until they know the updated value is replicated durably. One
simple option here might be to replicate any new values only to those shards on
whom the value's computation depended, so that any shard that receives this new
value is safely able to report what the outcome of the transaction is (but is
unable to participate in a recomputation of that part of the transaction).
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