Aleksey Yeschenko created CASSANDRA-6508:
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Summary: counters++ coalesce counter mutations with the same
partition key
Key: CASSANDRA-6508
URL: https://issues.apache.org/jira/browse/CASSANDRA-6508
Project: Cassandra
Issue Type: Improvement
Reporter: Aleksey Yeschenko
Assignee: Aleksey Yeschenko
CASSANDRA-6504 counter caching helps with hot counter cells, but doesn't really
help when we have a hot counter partition and different cells within being
updated simultaneously by different clients (the striped locks are
partition-level, not cell-level).
To improve performance in this scenario, we could coalesce the mutations in
COUNTER_MUTATION stage if they share the same partition key + target cf, and
apply them together, sharing a single lock.
If beneficial, this can go into 2.1.x or 3.0, doesn't have to be 2.1.0.
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