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July 19, 2023 23:43
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Description:
I observed a previous suggested fix injected some delay to fix the flaky test, but I believe that fix might be unstable in a CI environment or when run on different machines, given the dependency on some constant wait time. I suggest a new way to fix the test by adding some synchronization for the test execution only. I at first identify the source code location whose slow execution (from Line 436 to 442) leads to the flaky test failure. Hence, I introduce one variable in this test class that is only there to provide some synchronization. Basically, until these statements are executed, I force the thread that shuts down the services. The waiting location is at Line 447 of this test class.
Failure:
Running org.fluentd.logger.TestFluentLogger
2023-03-31 10:11:42,340 DEBUG [pool-2-thread-1] Started MockFluentd port:33845
Exception in thread "pool-3-thread-15" java.lang.NullPointerException
at org.fluentd.logger.FluentLogger.log(FluentLogger.java:101)
at org.fluentd.logger.FluentLogger.log(FluentLogger.java:86)
at org.fluentd.logger.TestFluentLogger$7.run(TestFluentLogger.java:436)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
java.lang.NullPointerException
at org.fluentd.logger.FluentLogger.log(FluentLogger.java:101)
at org.fluentd.logger.FluentLogger.log(FluentLogger.java:86)
at org.fluentd.logger.TestFluentLogger$7.run(TestFluentLogger.java:436)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Exception in thread "pool-3-thread-7" java.lang.NullPointerException
at org.fluentd.logger.FluentLogger.log(FluentLogger.java:101)
at org.fluentd.logger.FluentLogger.log(FluentLogger.java:86)
at org.fluentd.logger.TestFluentLogger$7.run(TestFluentLogger.java:436)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Exception in thread "pool-3-thread-10" java.lang.NullPointerException
at org.fluentd.logger.FluentLogger.log(FluentLogger.java:101)
at org.fluentd.logger.FluentLogger.log(FluentLogger.java:86)
at org.fluentd.logger.TestFluentLogger$7.run(TestFluentLogger.java:436)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
2023-03-31 10:16:50,774 ERROR [main] Timed out
2023-03-31 10:16:50,774 DEBUG [pool-2-thread-1] Terminated MockFluentd port:33845
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 308.585 sec <<< FAILURE!
Results :
Failed tests:
testInMultiThreading(org.fluentd.logger.TestFluentLogger): expected:<210000> but was:<209591>
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0