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https://issues.apache.org/jira/browse/CASSANDRA-6553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13947138#comment-13947138
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Russ Hatch commented on CASSANDRA-6553:
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more test data, comparing 2.0 vs 2.1, with count cache disabled:
The "uber contention" scenario was corrected for these tests. Earlier tests
were updating all 100 contended cells in *each* operation. These tests now
update one cell per operation, chosen from a uniform distribution of the 100
cells. This was the original intention of the uber contention tests, but I was
using cassandra-stress incorrectly earlier.
http://riptano.github.io/cassandra_performance/graph/graph.html?stats=6553.low_contention_no_cache_CL_one.json
http://riptano.github.io/cassandra_performance/graph/graph.html?stats=6553.high_contention_no_cache_CL_one.json
http://riptano.github.io/cassandra_performance/graph/graph.html?stats=6553.uber_contention_no_cache_CL_one.json
http://riptano.github.io/cassandra_performance/graph/graph.html?stats=6553.low_contention_no_cache_CL_quorum.json
http://riptano.github.io/cassandra_performance/graph/graph.html?stats=6553.high_contention_no_cache_CL_quorum.json
http://riptano.github.io/cassandra_performance/graph/graph.html?stats=6553.user_contention_no_cache_CL_quorum.json
uber contention counter read and writes both show some odd results. CL.ONE
writes degraded until stress gave up on the test.
> Benchmark counter improvements (counters++)
> -------------------------------------------
>
> Key: CASSANDRA-6553
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6553
> Project: Cassandra
> Issue Type: Test
> Reporter: Ryan McGuire
> Assignee: Russ Hatch
> Fix For: 2.1 beta2
>
> Attachments: 6553.uber.quorum.bdplab.read.png,
> 6553.uber.quorum.bdplab.write.png, high_cl_one.png, high_cl_quorum.png,
> low_cl_one.png, low_cl_quorum.png, tracing.txt, uber_cl_one.png,
> uber_cl_quorum.png
>
>
> Benchmark the difference in performance between CASSANDRA-6504 and trunk.
> * Updating totally unrelated counters (different partitions)
> * Updating the same counters a lot (same cells in the same partition)
> * Different cells in the same few partitions (hot counter partition)
> benchmark:
> https://github.com/apache/cassandra/tree/1218bcacba7edefaf56cf8440d0aea5794c89a1e
> (old counters)
> compared to:
> https://github.com/apache/cassandra/tree/714c423360c36da2a2b365efaf9c5c4f623ed133
> (new counters)
> So far, the above changes should only affect the write path.
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