[jira] [Created] (HADOOP-17468) NullPointerException from register in MetricsSystemImpl

classic Classic list List threaded Threaded
1 message Options
Reply | Threaded
Open this post in threaded view
|

[jira] [Created] (HADOOP-17468) NullPointerException from register in MetricsSystemImpl

Steve Loughran (Jira)
Janus Chow created HADOOP-17468:
-----------------------------------

             Summary: NullPointerException from register in MetricsSystemImpl
                 Key: HADOOP-17468
                 URL: https://issues.apache.org/jira/browse/HADOOP-17468
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Janus Chow


This is an error from Ozone's unit test case [HDDS-4688|https://github.com/apache/ozone/pull/1795#issuecomment-760052788]. The error is as follows:

 
{code:java}
java.lang.NullPointerException: configjava.lang.NullPointerException: config
 at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:897) at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.registerSink(MetricsSystemImpl.java:298) at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:277) at org.apache.hadoop.hdds.server.http.BaseHttpServer.start(BaseHttpServer.java:298)
...{code}
The reason should be happened here "https://github.com/apache/hadoop/commit/2f500e4635ea4347a55693b1a10a4a4465fe5fac#", if the _name_ is contained in _allSinks_ but not in _sink_, it will invoke the method of _registerSink_. But if the variable of config is null, it will throw the exception of NullPointerException.

 

A suggestion would be checking if the variable of config is null before calling _registerSink._



--
This message was sent by Atlassian Jira
(v8.3.4#803005)

---------------------------------------------------------------------
To unsubscribe, e-mail: [hidden email]
For additional commands, e-mail: [hidden email]