Rick Branson created CASSANDRA-5272:
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Summary: Hinted Handoff Throttle based on cluster size
Key: CASSANDRA-5272
URL: https://issues.apache.org/jira/browse/CASSANDRA-5272
Project: Cassandra
Issue Type: Improvement
Components: Core
Affects Versions: 1.2.1
Reporter: Rick Branson
For a 16-node EC2 m1.xlarge cluster, restarting a node causes it to get
completely overloaded with the default 2-thread, 1024KB setting in 1.2.x. This
seemed to be a smaller problem when it was 8-nodes, but still required us to
abort handoffs. The old defaults in 1.1.x were WAY more conservative. I've
dropped this way down to 128KB on our production cluster which is really
conservative, but appears to have solved it. The default seems way too high on
any cluster that is non-trivial in size.
After putting some thought to this, it seems that this should really be based
on cluster size, making the throttle a "target" for how much write load a
single node can swallow. As the cluster grows, the amount of hints that can be
delivered by each other node in the cluster goes down, so the throttle should
self-adjust to take that into account.
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