Spout Error from Apache Storm Trident and Kafka Integration

0
votes

I am using OpaqueTridentKafkaSpout to consume messages from Kafka. Below is the code. I have ignored max spout pending configuration as this is causing same kafka message to arrive in multiple batches.

TridentKafkaConfig tridentKafkaConfig = new TridentKafkaConfig(hosts,properties.getProperty("topic", "mytopic"));
tridentKafkaConfig.scheme = new SchemeAsMultiScheme(new StringScheme());
OpaqueTridentKafkaSpout kafkaSpout = new OpaqueTridentKafkaSpout(tridentKafkaConfig);

I am getting the following error once as the Kafka Spout starts, but runs smoothly afterwards.

2018-05-29 09:47:21.703 o.a.s.util Thread-9-spout-myspout-Spout-executor[33 33] [ERROR] Async loop died! java.lang.RuntimeException: java.lang.NullPointerException at org.apache.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:522) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:487) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.disruptor$consume_batch_when_available.invoke(disruptor.clj:74) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.daemon.executor$fn__5043$fn__5056$fn__5109.invoke(executor.clj:861) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.util$async_loop$fn__557.invoke(util.clj:484) [storm-core-1.2.1.jar:1.2.1] at clojure.lang.AFn.run(AFn.java:22) [clojure-1.7.0.jar:?] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171] Caused by: java.lang.NullPointerException at org.apache.storm.kafka.spout.trident.KafkaTridentSpoutEmitter.seek(KafkaTridentSpoutEmitter.java:193) ~[stormjar.jar:?] at org.apache.storm.kafka.spout.trident.KafkaTridentSpoutEmitter.emitPartitionBatch(KafkaTridentSpoutEmitter.java:127) ~[stormjar.jar:?] at org.apache.storm.kafka.spout.trident.KafkaTridentSpoutEmitter.emitPartitionBatch(KafkaTridentSpoutEmitter.java:51) ~[stormjar.jar:?] at org.apache.storm.trident.spout.OpaquePartitionedTridentSpoutExecutor$Emitter.emitBatch(OpaquePartitionedTridentSpoutExecutor.java:141) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.trident.spout.TridentSpoutExecutor.execute(TridentSpoutExecutor.java:82) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.trident.topology.TridentBoltExecutor.execute(TridentBoltExecutor.java:383) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.daemon.executor$fn__5043$tuple_action_fn__5045.invoke(executor.clj:739) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.daemon.executor$mk_task_receiver$fn__4964.invoke(executor.clj:468) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.disruptor$clojure_handler$reify__4475.onEvent(disruptor.clj:41) ~[storm-core-1.2.1.jar:1.2.1] at org.apache.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:509) ~[storm-core-1.2.1.jar:1.2.1] ... 6 more

Any suggestions regarding this ?

1
javanullpointerexceptionapache-kafkaapache-stormtrident
Could you please post the whole stack trace? There's likely a "caused by" line below what you posted that'll tell you where the NPE is coming from. - Stig Rohde Døssing
@StigRohdeDøssing I have updated the whole stack trace. Thanks - phaigeim
@StigRohdeDøssing I guess my problem is closely related to this groups.google.com/forum/#!topic/storm-user/wzdduOWul54 - phaigeim
The code snippet you posted doesn't match the stack trace. The code snippet is using the storm-kafka Trident spout, while the stack trace appears to be using the storm-kafka-client Trident spout. Which are you using? - Stig Rohde Døssing
@StigRohdeDøssing I am using Storm Kafka Client. Thanks - phaigeim

1 Answers