[HDDS-502] Exception in OM startup when running unit tests

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 0.2.1
• Component/s: Ozone Manager
• Assignee: Arpit Agarwal
• Reporter: Arpit Agarwal
• Created: 18/Sep/18 21:26
• Updated: 12/Nov/18 11:10
• Resolved: 19/Sep/18 14:19

Description

The following exception is seen while starting OM via MiniOzoneCluster:

2018-09-18 14:16:31,694 WARN  om.OzoneManager (LogAdapter.java:warn(59)) - failed to register any UNIX signal loggers: 
java.lang.IllegalStateException: Can't re-install the signal handlers.
	at org.apache.hadoop.util.SignalLogger.register(SignalLogger.java:77)
	at org.apache.hadoop.util.StringUtils.startupShutdownMessage(StringUtils.java:718)
	at org.apache.hadoop.util.StringUtils.startupShutdownMessage(StringUtils.java:707)
	at org.apache.hadoop.ozone.om.OzoneManager.createOm(OzoneManager.java:311)
	at org.apache.hadoop.ozone.MiniOzoneClusterImpl$Builder.createOM(MiniOzoneClusterImpl.java:423)
	at org.apache.hadoop.ozone.MiniOzoneClusterImpl$Builder.build(MiniOzoneClusterImpl.java:352)
	at org.apache.hadoop.ozone.web.client.TestKeys.init(TestKeys.java:143)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)

The exception is non-fatal so the tests eventually pass.