MyEnthusiastic opened a new pull request, #491:
URL: https://github.com/apache/curator/pull/491
# Problem
For these tests:
[INFO] org.apache.curator.framework.imps.TestReconfiguration#testAdd
[INFO]
org.apache.curator.framework.imps.TestReconfiguration#testNewMembersWithEmptyList
[INFO] org.apache.curator.framework.imps.TestReconfiguration#testAddAsync
[INFO] org.apache.curator.framework.imps.TestReconfiguration#testAddAndRemove
[INFO]
org.apache.curator.framework.imps.TestReconfiguration#testAddAndRemoveWithEmptyList
[INFO]
org.apache.curator.framework.imps.TestReconfiguration#testBasicGetConfig
[INFO]
org.apache.curator.framework.imps.TestReconfiguration#testRemoveWithChroot
They assume the order of the QuorumServer was same, but this is not
necessary the case because QuorumMaj aggressively use Map to store it's data
```
private Map<Long, QuorumPeer.QuorumServer> allMembers = new HashMap();
private HashMap<Long, QuorumPeer.QuorumServer> votingMembers = new
HashMap();
private HashMap<Long, QuorumPeer.QuorumServer> observingMembers = new
HashMap();
```
so because the order of the Map is indeterministic according to the
[Oracle's official
document](https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html#:~:text=This%20class%20makes%20no%20guarantees%20as%20to%20the%20order%20of%20the%20map),
so this might trigger error message in different environments:
```
[ERROR] org.apache.curator.framework.imps.TestReconfiguration.testAdd Time
elapsed: 0.641 s <<< FAILURE!
org.opentest4j.AssertionFailedError: expected:
<127.0.0.1:55254,127.0.0.1:55251,127.0.0.1:55248,0.0.0.0:55268> but was:
<0.0.0.0:55268,127.0.0.1:55251,127.0.0.1:55248,127.0.0.1:55254>
at
org.apache.curator.framework.imps.TestReconfiguration.testAdd(TestReconfiguration.java:281)
```
# Solution
So the most precise way to deal with that would be change the
configToConnectionString method to make sure when we serialize the
configurations, we always get the same result, so that the tests will be safe
in different environment (because the order of the map is undefined)
# Reproduce
This error can be reproduced with the
[NondexTool](https://github.com/TestingResearchIllinois/NonDex) with the
following command (you can try that without modifying the pom, but feel free to
use the plugin to protect your project and make it safer 😊 ), and this kind
problem is widely documented in [International Dataset of Flaky Tests
(IDoFT)](https://github.com/TestingResearchIllinois/idoft)
```
mvn edu.illinois:nondex-maven-plugin:2.1.7-SNAPSHOT:nondex -pl
/curator-framework -Dsurefire.useFile=false
-Dtest=org.apache.curator.framework.imps.TestReconfiguration#[methodName]
```
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