我試圖連接兩個卡夫卡流DSL KTable
使用:在RocksDB
KTable<String, String> source = builder.table("stream-source");
KTable<String, String> target = builder.table("stream-target");
source.join(target, new ValueJoiner<String, String, String>() {
public String apply(String value1, String value2) {
return value1 + ":" + value2;
}
});
我已經確定,無論是鍵和值不null
:
Producer<String, String> producer = new KafkaProducer<String, String>(props);
for(int i = 0; i < PERSONS_SOURCE.length; i++) {
producer.send(new ProducerRecord<String, String>("stream-source", Long.toString(i + 1L), PERSONS_SOURCE[i]));
}
for(int i = 0; i < PERSONS_TARGET.length; i++) {
producer.send(new ProducerRecord<String, String>("stream-target", Long.toString(i + 1L), PERSONS_TARGET[i]));
}
producer.close();
但是應用程序報告RocksDB層中有關於分區的空指針。
[2016年7月17日21:58:04682] ERROR用戶提供收聽org.apache.kafka.streams.processor.internals.StreamThread用於組流-persons2 1 $上分區分配失敗(org.apache。 kafka.clients.consumer.internals.ConsumerCoordinator) java.lang.NullPointerException at org.rocksdb.RocksDB.put(RocksDB.java:432) at org.apache.kafka.streams.state.internals.RocksDBStore.putInternal( RocksDBStore.java:299) at org.apache.kafka.streams.state.internals.RocksDBStore.access $ 200(RocksDBStore.java:62) at org.apache.kafka.streams.state.internals.RocksDBStore $ 3.restore( RocksDBStore.java:206) at org.apache.kafka.streams.processor .internals.ProcessorStateManager.restoreActiveState(ProcessorStateManager.java:245) at org.apache.kafka.streams.processor.internals.ProcessorStateManager.register(ProcessorStateManager.java:210) at org.apache.kafka.streams.processor.internals .ProcessorContextImpl.register(ProcessorContextImpl.java:116) 在org.apache.kafka.streams.state.internals.RocksDBStore.init(RocksDBStore.java:202)
你可能想接受你自己的回答:) –