Denes Arvay created NIFI-8285:
---------------------------------
Summary: NullPointerException in HBase_2_ClientService if kerberos
is not enabled
Key: NIFI-8285
URL: https://issues.apache.org/jira/browse/NIFI-8285
Project: Apache NiFi
Issue Type: Bug
Reporter: Denes Arvay
It seems this is a regression after NIFI-7954
The stack trace is the following:
{code:java}
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)
{code}
I did some research on this:
- {{HBase_2_ClientService.ugi}} is null if kerberos is not configured, see:
[HBase_2_ClientService.java#L359-L382|https://github.com/apache/nifi/blob/main/nifi-nar-bundles/nifi-standard-services/nifi-hbase_2-client-service-bundle/nifi-hbase_2-client-service/src/main/java/org/apache/nifi/hbase/HBase_2_ClientService.java#L359-L382]
- thus {{getUgi}} returns {{null}} at [HBase_2_ClientService.java#L582]
- and
[{{SecurityUtil.callWithUgi}}|https://github.com/apache/nifi/blob/main/nifi-nar-bundles/nifi-extension-utils/nifi-hadoop-utils/src/main/java/org/apache/nifi/hadoop/SecurityUtil.java#L154]
throws NPEx
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