[NIFI-8285] NullPointerException in HBase_2_ClientService if kerberos is not enabled

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 1.14.0, 1.13.1
• Assignee: Tamas Palfy
• Reporter: Denes Arvay
• Created: 02/Mar/21 14:41
• Updated: 09/Mar/21 21:33
• Resolved: 08/Mar/21 14:10

Description

It seems this is a regression after NIFI-7954
The stack trace is the following:

2021-03-02 14:29:37,171 WARN [Timer-Driven Process Thread-5] o.a.n.controller.tasks.ConnectableTask Administratively Yielding FetchDistributedMapCache[id=5aa4b8b0-0e2a-3e83-9163-c43105d05221] due to uncaught Exception: java.lang.NullPointerException
java.lang.NullPointerException: null
	at org.apache.nifi.hadoop.SecurityUtil.callWithUgi(SecurityUtil.java:149)
	at org.apache.nifi.hbase.HBase_2_ClientService.scan(HBase_2_ClientService.java:620)
	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.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:87)
	at com.sun.proxy.$Proxy99.scan(Unknown Source)
	at org.apache.nifi.hbase.HBase_2_ClientMapCacheService.get(HBase_2_ClientMapCacheService.java:217)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:87)
	at com.sun.proxy.$Proxy90.get(Unknown Source)
	at org.apache.nifi.processors.standard.FetchDistributedMapCache.onTrigger(FetchDistributedMapCache.java:230)
	at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
	at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1176)
	at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:213)
	at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
	at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

I did some research on this:

• HBase_2_ClientService.ugi is null if kerberos is not configured, see: HBase_2_ClientService.java#L359-L382
• thus getUgi returns null at HBase_2_ClientService.java#L582
• and SecurityUtil.callWithUgi throws NPEx

Issue Links

• links to: GitHub Pull Request #4868