Tupshin Harper created CASSANDRA-6127:
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Summary: vnodes don't scale to hundreds of nodes
Key: CASSANDRA-6127
URL: https://issues.apache.org/jira/browse/CASSANDRA-6127
Project: Cassandra
Issue Type: Bug
Components: Core
Environment: Any cluster that has vnodes and consists of hundreds of
physical nodes.
Reporter: Tupshin Harper
Assignee: Jonathan Ellis
There are a lot of gossip-related issues related to very wide clusters that
also have vnodes enabled. Let's use this ticket as a master in case there are
sub-tickets.
The most obvious symptom I've seen is with 1000 nodes in EC2 with m1.xlarge
instances. Each node configured with 32 vnodes.
Without vnodes, cluster spins up fine and is ready to handle requests within 30
minutes or less.
With vnodes, nodes are reporting constant up/down flapping messages with no
external load on the cluster. After a couple of hours, they were still
flapping, had very high cpu load, and the cluster never looked like it was
going to stabilize or be useful for traffic.
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