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Posted to common-dev@hadoop.apache.org by "Janus Chow (Jira)" <ji...@apache.org> on 2021/01/14 10:59:00 UTC
[jira] [Created] (HADOOP-17468) NullPointerException from register
in MetricsSystemImpl
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._
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