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Posted to jira@kafka.apache.org by "Zygimantas (Jira)" <ji...@apache.org> on 2020/03/13 10:52:00 UTC

[jira] [Created] (KAFKA-9717) KafkaStreams#metrics() method randomly throws NullPointerException

Zygimantas created KAFKA-9717:
---------------------------------

             Summary: KafkaStreams#metrics() method randomly throws NullPointerException
                 Key: KAFKA-9717
                 URL: https://issues.apache.org/jira/browse/KAFKA-9717
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 2.2.0
         Environment: Kubernetes
            Reporter: Zygimantas


We have implemented monitoring tool which monitors Kafka Streams application and regularly (every 20s) calls KafkaStreams.metrics() method in that application. But metrics() method randomly throws NullPointerException. It happens almost every time after application startup, but may also happen at random points in time after running application for few hours.

Stacktrace:
{code:java}
java.lang.NullPointerException
 at org.apache.kafka.streams.processor.internals.StreamThread.producerMetrics(StreamThread.java:1320)
 at org.apache.kafka.streams.KafkaStreams.metrics(KafkaStreams.java:379)
{code}



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