Jingxuan Fu created HADOOP-18362:
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Summary: Running org.apache.hadoop.ha.TestZKFailoverController
when "hadoop.security.groups.cache.secs" is zero or negative numbers will throw
ambiguous exception
Key: HADOOP-18362
URL: https://issues.apache.org/jira/browse/HADOOP-18362
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 2.10.2
Environment: Linux version 4.15.0-142-generic (buildd@lgw01-amd64-039)
(gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12))
Reporter: Jingxuan Fu
{{<property>}}
{{ <name>hadoop.security.groups.cache.secs</name>}}
{{ <value>300</value>}}
{{ <description>}}
{{ This is the config controlling the validity of the entries in the cache}}
{{ containing the user->group mapping. When this duration has expired,}}
{{ then the implementation of the group mapping provider is invoked to get}}
{{ the groups of the user and then cached back.}}
{{ </description>}}
{{</property>}}
As we see in core-site.xml of hadoop.security.groups.cache.secs, the default
value is 300. But when we set it to zero or negative number and then run
org.apache.hadoop.ha.TestZKFailoverController#testGracefulFailoverMultipleZKfcs,
it will throw NullPointerException as below：
{quote}{{[INFO] Running org.apache.hadoop.ha.TestZKFailoverController}}
{{[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.932
s <<< FAILURE! - in org.apache.hadoop.ha.TestZKFailoverController}}
{{[ERROR]
testGracefulFailoverMultipleZKfcs(org.apache.hadoop.ha.TestZKFailoverController)
Time elapsed: 0.799 s <<< ERROR!}}
{{java.lang.NullPointerException}}
{{ at
org.apache.hadoop.ha.ZKFailoverController.run(ZKFailoverController.java:188)}}
{{ at
org.apache.hadoop.ha.MiniZKFCCluster.start(MiniZKFCCluster.java:116)}}
{{ at
org.apache.hadoop.ha.TestZKFailoverController.testGracefulFailoverMultipleZKfcs(TestZKFailoverController.java:581)}}
{{ 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$1.runReflectiveCall(FrameworkMethod.java:59)}}
{{ at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)}}
{{ at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)}}
{{ at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)}}
{{ at
org.apache.zookeeper.JUnit4ZKTestRunner$LoggedInvokeMethod.evaluate(JUnit4ZKTestRunner.java:55)}}
{{ at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)}}
{{ at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)}}
{{ at org.junit.rules.TestWatchman$1.evaluate(TestWatchman.java:53)}}
{{ at
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)}}
{{ at
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)}}
{{ at java.util.concurrent.FutureTask.run(FutureTask.java:266)}}
{{ at java.lang.Thread.run(Thread.java:748)}}
{quote}
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