Hi, we want to add a new DC to our existing 2 DC cluster Cassandra 3.11.4. In
our preparations we noticed the system_distributed keyspace still on
SimpleStrategy and decided to do alter keyspace to change it into
NetworkTopologyStrategy according to documentation online on the existing 2 DC
cluster (running already 1 year). We did not create the existing Cassandra
ourselves.
we did:
ALTER KEYSPACE system_distributed WITH replication = {
'class': 'NetworkTopologyStrategy',
'<dc_name1>': '<replication_factor>',
'<dc_name2>': '<replication_factor>'
};
This in itself went fine. Then we did nodetool repair -full on each node. Also
went fine.
But now, when we do a count query on the system_distributed keyspace
parent_repair_history or repair_history tables, we get varying results
everytime we do this query, querying immediately after each other. Sometimes
count is a bigger number, sometimes a smaller number
query:
select count(parent_id) from system_distributed.parent_repair_history
Should we perform other actions as well?
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