CODEWITHSUNDEEP
cassandradatastaxdatastax-enterprise
worker1138
worker1138

Reputation: 2101

How to safely decommission Analytics DC in Cassandra?

I have a Cassandra cluster with 6 nodes, 3 are in the main Cassandra DC, and 3 are in an Analytics DC. I no longer need the Analytics DC, and I want to decommission it. I want to make sure I am doing it safely, in that I do not want to affect the Cassandra DC or my clients. I have only one keyspace that is replicated across the DC's, and I was planning to use ALTER KEYSPACE to simply remove the replication to the Analytics DC. After that, I'd just terminate the Analytics nodes in ec2. Is this a safe plan?

Upvotes: 0

Views: 176

Answers (1)

Jeff Jirsa
Jeff Jirsa

Reputation: 4426

1) Use ALTER KEYSPACE to remove the analytics DC from the replication strategy.

2) Use nodetool decommission to safely remove those nodes from the cluster (one at a time, ideally). They'll no longer own any data, so they'll have nothing to stream to their neighbors.

3) Terminate the instances.

Upvotes: 2

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