[GitHub] [jackrabbit-oak] LeoYimingLi opened a new pull request #433: Fix 4 flaky tests by using LinkedHashSet

Wed, 08 Dec 2021 03:32:28 -0800 


LeoYimingLi opened a new pull request #433:
URL: https://github.com/apache/jackrabbit-oak/pull/433


   - Related 4 flaky tests:
     - 
org.apache.jackrabbit.oak.plugins.document.ClusterViewTest#testOneActiveSeveralInactive
    
     - 
org.apache.jackrabbit.oak.plugins.document.ClusterViewTest#testSeveralActiveOneInactive
    
     - 
org.apache.jackrabbit.oak.plugins.document.ClusterViewTest#testWithRecoveringAndBacklog
    
     - 
org.apache.jackrabbit.oak.plugins.document.ClusterViewTest#testWithRecoveringOnly
    
   - The flakiness is due to the nondeterministic iterative order of 
```HashSet```
   
   - This proposed method is changing ```HashSet``` to ```LinkedHashSet``` to 
keep the order deterministic.    
   
   More Information
   - Version of ```jackrabbit-oak```
     SHA: 08eab301c869c227d8721da0e9b9bd3d2029d458
   
   - JVM version
     > openjdk version "1.8.0_292"
   OpenJDK Runtime Environment (build 1.8.0_292-8u292-b10-0ubuntu1~18.04-b10)
   OpenJDK 64-Bit Server VM (build 25.292-b10, mixed mode)
   
   - The way to reproduce the flaky test failure (using the test 
```org.apache.jackrabbit.oak.plugins.document.ClusterViewTest#testOneActiveSeveralInactive```
 as example)
     - 0.Environment setup: Maven 3.6.0 and Java 1.8.0_292
     - 1.clone the repo:
     ```
     git clone https://github.com/apache/jackrabbit-oak
     cd jackrabbit-oak
     git checkout 08eab301c869c227d8721da0e9b9bd3d2029d458
     ```
     - 2.run with [Nondex 
tool](https://github.com/TestingResearchIllinois/NonDex) (which explores 
different behaviors of under-determined APIs and reports test failures)
     ```
     mvn install -pl core -am -DskipTests
     mvn -pl core edu.illinois:nondex-maven-plugin:1.1.2:nondex 
-Dtest=org.apache.jackrabbit.oak.plugins.document.ClusterViewTest#testOneActiveSeveralInactive
     ```
     - 3.And we can get the test failure screenshot:
   
![image](https://user-images.githubusercontent.com/46290389/145200735-32b51ff6-d5f4-408a-961e-4e186796ac15.png)
   
     - 4.about the code trace:
     ```
     mvn -pl core edu.illinois:nondex-maven-plugin:1.1.2:debug 
-Dtest=org.apache.jackrabbit.oak.plugins.document.ClusterViewTest#testOneActiveSeveralInactive
     ```
     we can get the code trace result
   
![image](https://user-images.githubusercontent.com/46290389/145200761-17bfed55-59c5-4f83-8ab8-dd99cae8cc12.png)
   


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