I have a remote Kafka cluster, to which I connect using a VPN and a not-so-great WiFi network. That means that sometimes the Kafka Client loses briefly loses connectivity. When it regains a connection after a while, I see:
org.apache.kafka.clients.consumer.CommitFailedException: Commit cannot be completed since the group has already rebalanced and assigned the partitions to another member. This means that the time between subsequent calls to poll() was longer than the configured max.poll.interval.ms, which typically implies that the poll loop is spending too much time message processing. You can address this either by increasing the session timeout or by reducing the maximum size of batches returned in poll() with max.poll.records. ... Which makes sense I suppose, but this shouldn't be fatal. But then I see: [StreamThread-1] ERROR org.apache.kafka.streams.processor.internals.StreamThread - stream-thread [StreamThread-1] Failed to create an active task %s: org.apache.kafka.streams.errors.ProcessorStateException: task [0_0] Error while creating the state manager at org.apache.kafka.streams.processor.internals.AbstractTask.<init>(AbstractTask.java:72) at org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:89) at org.apache.kafka.streams.processor.internals.StreamThread.createStreamTask(StreamThread.java:633) at org.apache.kafka.streams.processor.internals.StreamThread.addStreamTasks(StreamThread.java:660) at org.apache.kafka.streams.processor.internals.StreamThread.access$100(StreamThread.java:69) at org.apache.kafka.streams.processor.internals.StreamThread$1.onPartitionsAssigned(StreamThread.java:124) at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:228) at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:313) at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:277) at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:259) at org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1013) at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:979) at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:407) at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:242) Caused by: java.io.IOException: task [0_0] Failed to lock the state directory: /Users/frank/git/dexels.repository/com.dexels.kafka.streams/kafka-streams/develop3-person/0_0 at org.apache.kafka.streams.processor.internals.ProcessorStateManager.<init>(ProcessorStateManager.java:101) at org.apache.kafka.streams.processor.internals.AbstractTask.<init>(AbstractTask.java:69) ... 13 more And my stream applications is dead. So I'm guessing that either the store wasn't closed properly or some things happen out of order. Any ideas? I'm using the trunk of Kafka 0.10.2.0-SNAPSHOT, Java 1.8.0_66 on MacOS 10.11.6 regards, Frank
