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https://issues.apache.org/jira/browse/CASSANDRA-15650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17064073#comment-17064073
 ] 

David Capwell commented on CASSANDRA-15650:
-------------------------------------------

To help me replicate I am using the following scripts

{code}
$ cat ci-test-loop
#!/usr/bin/env bash

#set -o xtrace
set -o errexit
set -o pipefail
set -o nounset

class_name="$1"
path="$(echo "$class_name" | tr '.' '/' ).java"
prefix="$( find test | grep "$path" | awk -F/ '{print $2}' )"

while ant testclasslist -Dtest.classlistfile=<(echo "$path") 
-Dtest.classlistprefix=$prefix ; do
  rm -rf build/test/logs || true
done;
{code}

{code}
$ cat mac-throttle.sh
#!/usr/bin/env bash

#set -o xtrace
set -o errexit
set -o pipefail
set -o nounset

bin="$(cd "$(dirname "$0")" > /dev/null; pwd)"

_main() {
  local pid
  while true; do
    pid="$(ps -ef | grep JUnitTestRunner | grep -v grep | awk '{print $2}' || 
true)"
    if [ ! -z "${pid:-}" ]; then
      renice +15 -p $pid || true
    fi
    sleep 1
  done
}

_main "$@"
{code}

{code}
for core in $(sudo cpuctl list | awk -F: '{print $1}' | tr -d 'CPU' | tail -n 
+3); do sudo cpuctl offline $core; done;
{code}

> Fix flaky test 
> org.apache.cassandra.distributed.test.*RepairCoordinatorFastTest
> -------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15650
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15650
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Test/dtest
>            Reporter: David Capwell
>            Assignee: David Capwell
>            Priority: Normal
>             Fix For: 4.0-alpha
>
>
> Test failure: 
> https://app.circleci.com/pipelines/github/dcapwell/cassandra/177/workflows/3dff37a5-9bf4-40e2-8d5b-f127b416dc79/jobs/862
> {code}
> [junit-timeout] Testcase: 
> onlyCoordinator[SEQUENTIAL/true](org.apache.cassandra.distributed.test.FullRepairCoordinatorFastTest):
>       FAILED
> [junit-timeout] nodetool command repair was successful but not expected to 
> be. Actual: 0
> [junit-timeout] junit.framework.AssertionFailedError: nodetool command repair 
> was successful but not expected to be. Actual: 0
> [junit-timeout]       at 
> org.apache.cassandra.distributed.api.NodeToolResult$Asserts.failure(NodeToolResult.java:76)
> [junit-timeout]       at 
> org.apache.cassandra.distributed.test.RepairCoordinatorFast.onlyCoordinator(RepairCoordinatorFast.java:255)
> [junit-timeout]       at 
> java.util.concurrent.FutureTask.run(FutureTask.java:266)
> [junit-timeout]       at java.lang.Thread.run(Thread.java:748)
> {code}



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