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Aleksey Yeschenko reopened CASSANDRA-6488: ------------------------------------------ So, the caching part. [~jbellis] can you have a look? If not, I will, later, but it's potentially 1.2.13 vote-affecting. > 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: Rick Branson > Fix For: 1.2.13, 2.0.4 > > Attachments: 6488-rbranson-patch.txt, 6488-v2.txt, 6488-v3.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. -- This message was sent by Atlassian JIRA (v6.1.4#6159)