chia7712 commented on code in PR #17019:
URL: https://github.com/apache/kafka/pull/17019#discussion_r1734895192


##########
.github/workflows/deflake.yml:
##########
@@ -0,0 +1,77 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: 'Deflake a test'
+on:
+  workflow_dispatch:
+    inputs:
+      test-module:
+        description: 'Gradle sub-module which contains the test being 
de-flaked. Should be like :core'
+        required: true
+        type: string
+      test-pattern:
+        description: 'Test class to de-flake. Should be like *SomeTest*'
+        required: true
+        type: string
+      test-repeat:
+        description: 'Number of times to invoke the test'

Review Comment:
   Should we remind users that it works only for 
`ClusterTest`/`ClusterTemplate`/`ClusterTests`?



##########
.github/workflows/deflake.yml:
##########
@@ -0,0 +1,77 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: 'Deflake a test'
+on:
+  workflow_dispatch:
+    inputs:
+      test-module:
+        description: 'Gradle sub-module which contains the test being 
de-flaked. Should be like :core'
+        required: true
+        type: string
+      test-pattern:
+        description: 'Test class to de-flake. Should be like *SomeTest*'
+        required: true
+        type: string
+      test-repeat:
+        description: 'Number of times to invoke the test'
+        required: true
+        type: number
+        default: 1
+      java-version:
+        description: 'Java version to use.'
+        required: true
+        type: string
+        default: '17'
+
+jobs:
+  deflake:
+    runs-on: ubuntu-latest
+    name: Deflake JUnit tests
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Setup Gradle
+        uses: ./.github/actions/setup-gradle
+        with:
+          java-version: ${{ inputs.java-version }}
+          gradle-cache-read-only: true
+          develocity-access-key: ${{ secrets.GE_ACCESS_TOKEN }}
+      - name: Test
+        timeout-minutes: 60
+        run: |
+          ./gradlew --build-cache --scan --continue \
+          -PtestLoggingEvents=started,passed,skipped,failed \
+          -PignoreFailures=true -PmaxParallelForks=2 \
+          -PmaxTestRetries=1 -PmaxTestRetryFailures=10 \

Review Comment:
   Why we need this retry when we are going to loop them? 



##########
build.gradle:
##########
@@ -476,6 +476,8 @@ subprojects {
     maxHeapSize = defaultMaxHeapSize
     jvmArgs = defaultJvmArgs
 
+    systemProperty("kafka.cluster.test.repeat", 
project.findProperty("kafka.cluster.test.repeat"))

Review Comment:
   Could you add comment for this project variable?



##########
core/src/test/java/kafka/test/junit/ClusterTestExtensions.java:
##########
@@ -241,6 +241,26 @@ private List<TestTemplateInvocationContext> 
processClusterTestInternal(Extension
                 .collect(Collectors.toList());
     }
 
+    private List<TestTemplateInvocationContext> repeatTestContexts(
+        List<TestTemplateInvocationContext> contexts
+    ) {
+        int count;
+        try {
+            String repeatCount = 
System.getProperty("kafka.cluster.test.repeat", "1");
+            count = Integer.parseInt(repeatCount);
+        } catch (NumberFormatException e) {
+            count = 1;
+        }
+        if (count <= 1) {
+            return contexts;
+        }
+        List<TestTemplateInvocationContext> repeatedContexts = new 
ArrayList<>(contexts.size() * count);
+        for (int i = 0; i < count; i++) {
+            repeatedContexts.addAll(contexts);

Review Comment:
   We don't create copy of contexts, so those contexts must a kind of immutable 
objects to avoid corruption caused by other run. Hence, could you add comments 
to `ZkClusterInvocationContext` and `RaftClusterInvocationContext` to highlight 
the requisite. Also, could you please move the `clusterReference` of 
`ZkClusterInvocationContext` to be a local variable to make 
`ZkClusterInvocationContext` be immutable.
   
   
https://github.com/apache/kafka/blob/trunk/core/src/test/java/kafka/test/junit/ZkClusterInvocationContext.java#L78



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