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https://issues.apache.org/jira/browse/CASSANDRA-14078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277724#comment-16277724
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Jaydeepkumar Chovatia commented on CASSANDRA-14078:
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Hi [~KurtG]
In my opinion, theoretically thats the right approach to take, but in practical
scenario very tricky to make it work all the time.
Jaydeep
> Fix dTest test_bulk_round_trip_blogposts_with_max_connections
> -------------------------------------------------------------
>
> Key: CASSANDRA-14078
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14078
> Project: Cassandra
> Issue Type: Test
> Components: Testing
> Reporter: Jaydeepkumar Chovatia
> Assignee: Jaydeepkumar Chovatia
> Priority: Minor
>
> This ticket is regarding following dTest
> {{cqlsh_tests.cqlsh_copy_tests.CqlshCopyTest.test_bulk_round_trip_blogposts_with_max_connections}}
> This test is trying to limit number of client connections and assumes that
> once connection count has reached then client will fail-over to other node
> and do the request. The reason is, it is not deterministic test case as it
> totally depends on what hardware you run, timing, etc.
> For example
> If we look at
> https://builds.apache.org/view/A-D/view/Cassandra/job/Cassandra-trunk-dtest/353/testReport/cqlsh_tests.cqlsh_copy_tests/CqlshCopyTest/test_bulk_round_trip_blogposts_with_max_connections/
> {quote}
> ...
> Processed: 5000 rows; Rate: 2551 rows/s; Avg. rate: 2551 rows/s
> All replicas busy, sleeping for 4 second(s)...
> Processed: 10000 rows; Rate: 2328 rows/s; Avg. rate: 2307 rows/s
> All replicas busy, sleeping for 1 second(s)...
> Processed: 15000 rows; Rate: 2137 rows/s; Avg. rate: 2173 rows/s
> All replicas busy, sleeping for 11 second(s)...
> Processed: 20000 rows; Rate: 2138 rows/s; Avg. rate: 2164 rows/s
> Processed: 25000 rows; Rate: 2403 rows/s; Avg. rate: 2249 rows/s
> Processed: 30000 rows; Rate: 2582 rows/s; Avg. rate: 2321 rows/s
> Processed: 35000 rows; Rate: 2835 rows/s; Avg. rate: 2406 rows/s
> Processed: 40000 rows; Rate: 2867 rows/s; Avg. rate: 2458 rows/s
> Processed: 45000 rows; Rate: 3163 rows/s; Avg. rate: 2540 rows/s
> Processed: 50000 rows; Rate: 3200 rows/s; Avg. rate: 2596 rows/s
> Processed: 50234 rows; Rate: 2032 rows/s; Avg. rate: 2572 rows/s
> All replicas busy, sleeping for 23 second(s)...
> Replicas too busy, given up
> ...
> {quote}
> Here we can see request is timing out, sometimes it resumes after 1 second,
> next time 11 seconds and some times it doesn't work at all.
> In my opinion this test is not a good fit for dTest as dTest(s) should be
> deterministic.
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