Stefan Miklosovic created CASSANDRA-17759:
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Summary: Creation of a keyspace with RF equal to all nodes
including gossipping-only members should fail
Key: CASSANDRA-17759
URL: https://issues.apache.org/jira/browse/CASSANDRA-17759
Project: Cassandra
Issue Type: New Feature
Reporter: Stefan Miklosovic
Imagine there is a 5-node cluster where two nodes are gossipping-only members
(-Dcassandra.join_ring=false) - or in other words, 3 data nodes and 2
"coordinator" nodes.
Coordinator nodes are capable to speak CQL as well so requests can be executed
against them. If we create a keyspace against such node, like "create keyspace
ks1 with replication = {class = "NTS", "dc1": 5}, this query succeeds but if we
set CONSISTENCY to ALL in cqlsh and we try to insert some data into a table of
such keyspace, it will fail - because it does not have enough replicas. It has
only 3.
If this query is executed on data node (a proper member of a ring), this should
fail too. I think there is a mechanism how to do this, like by Guardrails but
there is no check which would include gossipping-only members into
consideration.
Ideally, we might introduce a check which would check that the replication
factor is at most as big the number of members - irrelevant of their current
status, they just have to be members of the ring.
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