Rick Branson created CASSANDRA-6488:
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Summary: Batchlog writes consume unnecessarily large amounts of
CPU on vnodes clusters
Key: CASSANDRA-6488
URL: https://issues.apache.org/jira/browse/CASSANDRA-6488
Project: Cassandra
Issue Type: Bug
Reporter: Rick Branson
Assignee: Aleksey Yeschenko
Attachments: 6488-rbranson-patch.txt, graph (21).png
The cloneTokenOnlyMap call in StorageProxy.getBatchlogEndpoints causes enormous
amounts of CPU to be consumed on clusters with many vnodes. I created a patch
to cache this data as a workaround and deployed it to a production cluster with
15,000 tokens. CPU consumption drop to 1/5th. This highlights the overall
issues with cloneOnlyTokenMap() calls on vnodes clusters. I'm including the
maybe-not-the-best-quality workaround patch to use as a reference, but
cloneOnlyTokenMap is a systemic issue and every place it's called should
probably be investigated.
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