Lukas Gemela created KAFKA-5242:
-----------------------------------
Summary: state task directory locked forever
Key: KAFKA-5242
URL: https://issues.apache.org/jira/browse/KAFKA-5242
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 0.10.2.0
Reporter: Lukas Gemela
Attachments: clio_170511.log
>From time to time, during relabance we are getting a lot of exceptions saying
{code}
org.apache.kafka.streams.errors.LockException: task [0_0] Failed to lock the
state directory: /app/db/clio/0_0
at
org.apache.kafka.streams.processor.internals.ProcessorStateManager.<init>(ProcessorStateManager.java:102)
~[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.AbstractTask.<init>(AbstractTask.java:73)
~[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:108)
~[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamThread.createStreamTask(StreamThread.java:834)
~[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:1207)
~[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.retryWithBackoff(StreamThread.java:1180)
[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamThread.addStreamTasks(StreamThread.java:937)
[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamThread.access$500(StreamThread.java:69)
[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamThread$1.onPartitionsAssigned(StreamThread.java:236)
[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:255)
[kafka-clients-0.10.2.0.jar!/:?]
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:339)
[kafka-clients-0.10.2.0.jar!/:?]
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:303)
[kafka-clients-0.10.2.0.jar!/:?]
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:286)
[kafka-clients-0.10.2.0.jar!/:?]
at
org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1030)
[kafka-clients-0.10.2.0.jar!/:?]
at
org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:995)
[kafka-clients-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:582)
[kafka-streams-0.10.2.0.jar!/:?]
at
org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:368)
[kafka-streams-0.10.2.0.jar!/:?]
{code}
(see attached logfile)
By looking at the code looks like the some old tasks are never being closed and
the lock is never released.
Also, the backoff strategy in StreamThread$AbstractTaskCreator.retryWithBackoff
can run endlessly - after 20 iterations it takes 6hours until the next attempt
to start a task.
I've noticed latest code contains check for rebalanceTimeoutMs, but that still
does not solve the problem especially in case MAX_POLL_INTERVAL_MS_CONFIG is
set to Integer.MAX_INT.
I would personally make that backoffstrategy a bit more configurable with a
number of retries that if it exceed a configured value it propagates the
exception as any other exception to custom client exception handler.
(I can provide a patch)
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