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https://issues.apache.org/jira/browse/CASSANDRA-13517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17309065#comment-17309065
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Adam Holmberg edited comment on CASSANDRA-13517 at 3/26/21, 12:35 AM:
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The test fails this way intermittently, but consistently on a
resource-constrained VM. Failures are characterized by driver heartbeat
timeouts which [exits the
worker|https://github.com/apache/cassandra-dtest/blob/49f46fce94c8f25f32e9b778ded8b14c30ad851e/paxos_test.py#L145-L149]
and does not retry. I think the server and cluster are just being overwhelmed.
This never fails on a well-provisioned machine.
The proposed change creates a client connection with ample timeouts and
heartbeats disabled. I'm also reducing the concurrency from one arbitrary
number to another slightly smaller arbitrary number to make it a bit more
appropriate in the envelope of a single-host three-node test cluster.
[test patch|https://github.com/aholmberg/cassandra-dtest/pull/5]
[ci|https://app.circleci.com/pipelines/github/aholmberg/cassandra?branch=CASSANDRA-13517]
(started, not reviewed)
was (Author: aholmber):
The test fails this way intermittently, but consistently on a
resource-constrained VM. Failures are characterized by driver heartbeat
timeouts which [exits the
worker|https://github.com/apache/cassandra-dtest/blob/49f46fce94c8f25f32e9b778ded8b14c30ad851e/paxos_test.py#L145-L149]
and does not retry.
The proposed change creates a client connection with ample timeouts and
heartbeats disabled. I'm also reducing the concurrency from one arbitrary
number to another slightly smaller arbitrary number to make it a bit more
appropriate in the envelope of a single-host three-node test cluster.
[test patch|https://github.com/aholmberg/cassandra-dtest/pull/5]
[ci|https://app.circleci.com/pipelines/github/aholmberg/cassandra?branch=CASSANDRA-13517]
(started, not reviewed)
> dtest failure in paxos_tests.TestPaxos.contention_test_many_threads
> -------------------------------------------------------------------
>
> Key: CASSANDRA-13517
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13517
> Project: Cassandra
> Issue Type: Bug
> Components: Test/dtest/python
> Reporter: Ariel Weisberg
> Assignee: Adam Holmberg
> Priority: Normal
> Labels: dtest, test-failure, test-failure-fresh
> Fix For: 4.0-rc
>
> Attachments: test_failure.txt
>
>
> Error Message
> AssertionError: value=278, errors=22, retries=2888 assert (278 == (300 * 1))
> {noformat}
> > assert (value == threads * iterations) and (errors == 0), "value={},
> > errors={}, retries={}".format(value, errors, retries)
> E AssertionError: value=278, errors=22, retries=2888 E assert (278 == (300 *
> 1))
> paxos_test.py:195: AssertionError
> {noformat}
>
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