Hi Chris, >From the logs it seems your controller machine id=2 has some soft failure, such as a long GC which casued it to session timeout from ZK. Then when it is shutting down it hits a known bug (related to KAFKA-1311) in 0.8.1 which will cause it to hang on controller shutdown. We are currently releasing a new version 0.8.1.1 with the fix to this bug.
Thanks, Guozhang On Thu, Apr 3, 2014 at 5:11 AM, Krzysztof Ociepa <ociepa.krzysz...@gmail.com > wrote: > Hi Team, > > I test Kafka 0.8.1 and have problems with missing brokers. What I did: > > 1. Installed Zookeeper 3.3.6 servers on 3 dedicated machines > 2. Installed Kafka 0.8.1 brokers on 3 machines (different from Zookeeper > ones) > 3. Configured brokers as above: > # Replication configurations > num.replica.fetchers=2 > replica.fetch.max.bytes=1048576 > replica.fetch.wait.max.ms=500 > replica.high.watermark.checkpoint.interval.ms=5000 > replica.socket.timeout.ms=30000 > replica.socket.receive.buffer.bytes=65536 > replica.lag.time.max.ms=10000 > replica.lag.max.messages=4000 > controller.socket.timeout.ms=30000 > controller.message.queue.size=10 > controlled.shutdown.enable=true > auto.leader.rebalance.enable=true > leader.imbalance.check.interval.seconds=1200 > > # ZK configuration > zookeeper.connection.timeout.ms=6000 > zookeeper.sync.time.ms=3000 > > 4. Started Zookeeper and brokers. Created topics. In Zookeeper client I > saw: > ls /brokers/ids > [3, 2, 1] > > 5. Ran producers and consumers with very low traffic. All worked fine. > 6. Increased traffic to ~100 messages per second and the controller > (ID=2 / machine 2) failed with broker on the same machine (I've seen few > times this scenario on my cluster). > > My logs as following. > Machine 2: > > Controller ID=2: > [2014-04-02 10:38:37,152] INFO > [Controller-2-to-broker-3-send-thread], Starting > (kafka.controller.RequestSendThread) > [2014-04-02 10:42:21,131] INFO [SessionExpirationListener on 2], ZK > expired; shut down all controller components and try to re-elect > (kafka.controller.KafkaController$SessionExpirationListener) > [2014-04-02 10:42:21,176] INFO [delete-topics-thread], Shutting down > (kafka.controller.TopicDeletionManager$DeleteTopicsThread) > > Server ID=2: > [2014-04-02 10:38:39,113] INFO Partition [topic1,1] on broker 2: > Expanding ISR for partition [topic1,1] from 2,1 to 2,1,3 > (kafka.cluster.Partition) > [2014-04-02 10:38:39,129] INFO Partition [topic2,1] on broker 2: > Expanding ISR for partition [topic2,1] from 2,1 to 2,1,3 > (kafka.cluster.Partition) > [2014-04-02 10:38:39,488] INFO Closing socket connection to > /11.111.1.19. (kafka.network.Processor) > [2014-04-02 10:38:45,343] INFO Closing socket connection to > /11.111.1.19. (kafka.network.Processor) > [2014-04-02 10:39:21,842] INFO Closing socket connection to > /11.111.1.110. (kafka.network.Processor) > [2014-04-02 10:41:24,605] INFO Partition [topic3,1] on broker 2: > Shrinking ISR for partition [topic3,1] from 2,1,3 to 2,1 > (kafka.cluster.Partition) > [2014-04-02 10:41:26,748] INFO Partition [topic3,1] on broker 2: > Expanding ISR for partition [topic3,1] from 2,1 to 2,1,3 > (kafka.cluster.Partition) > [2014-04-02 10:42:22,727] INFO Closing socket connection to > /11.111.1.21. (kafka.network.Processor) > [2014-04-02 10:42:23,181] INFO Closing socket connection to > /11.111.1.21. (kafka.network.Processor) > [2014-04-02 10:42:24,351] INFO Closing socket connection to > /11.111.1.25. (kafka.network.Processor) > [2014-04-02 10:42:24,501] INFO Closing socket connection to > /11.111.1.25. (kafka.network.Processor) > [2014-04-02 10:42:27,915] ERROR [ReplicaFetcherThread-0-1], Error > for partition [topic2,4] to broker 1:class > kafka.common.NotLeaderForPartitionException > (kafka.server.ReplicaFetcherThread) > ... > [2014-04-02 10:42:34,575] ERROR Conditional update of path > /brokers/topics/topic1/partitions/1/state with data > > {"controller_epoch":7,"leader":2,"version":1,"leader_epoch":61,"isr":[2]} > and expected version 119 failed due to > org.apache.zookeeper.KeeperException$BadVersionException: > KeeperErrorCode = BadVersion for > /brokers/topics/topic1/partitions/1/state (kafka.utils.ZkUtils$) > [2014-04-02 10:42:34,575] INFO Partition [topic1,1] on broker 2: > Cached zkVersion [119] not equal to that in zookeeper, skip updating > ISR (kafka.cluster.Partition) > > State-change ID=2: > [2014-04-02 10:38:37,134] TRACE Controller 2 epoch 7 received > response correlationId 313 for a request sent to broker > id:2,host:11.111.1.23,port:9092 (state.change.logger) > [2014-04-02 10:38:37,696] TRACE Controller 2 epoch 7 received > response correlationId 313 for a request sent to broker > id:1,host:11.111.1.21,port:9092 (state.change.logger) > [2014-04-02 10:38:38,682] TRACE Controller 2 epoch 7 received > response correlationId 312 for a request sent to broker > id:3,host:11.111.1.25,port:9092 (state.change.logger) > [2014-04-02 10:38:38,909] TRACE Controller 2 epoch 7 received > response correlationId 313 for a request sent to broker > id:3,host:11.111.1.25,port:9092 (state.change.logger) > [2014-04-02 10:38:38,918] TRACE Controller 2 epoch 7 received > response correlationId 313 for a request sent to broker > id:3,host:11.111.1.25,port:9092 (state.change.logger) > > Machine 1: > > Controller ID=1: > [2014-04-02 10:42:20,342] INFO [Controller 1]: Broker 1 starting > become controller state transition (kafka.controller.KafkaController) > [2014-04-02 10:42:20,372] INFO [Controller 1]: Controller 1 > incremented epoch to 8 (kafka.controller.KafkaController) > [2014-04-02 10:42:21,176] DEBUG [Channel manager on controller 1]: > Controller 1 trying to connect to broker 1 > (kafka.controller.ControllerChannelManager) > [2014-04-02 10:42:21,238] INFO > [Controller-1-to-broker-1-send-thread], Controller 1 connected to > id:1,host:11.111.1.21,port:9092 for sending state change requests > (kafka.controller.RequestSendThread) > [2014-04-02 10:42:21,239] DEBUG [Channel manager on controller 1]: > Controller 1 trying to connect to broker 3 > (kafka.controller.ControllerChannelManager) > [2014-04-02 10:42:21,460] INFO > [Controller-1-to-broker-3-send-thread], Controller 1 connected to > id:3,host:11.111.1.25,port:9092 for sending state change requests > (kafka.controller.RequestSendThread) > [2014-04-02 10:42:21,483] INFO > [Controller-1-to-broker-3-send-thread], Starting > (kafka.controller.RequestSendThread) > [2014-04-02 10:42:21,483] INFO > [Controller-1-to-broker-1-send-thread], Starting > (kafka.controller.RequestSendThread) > [2014-04-02 10:42:21,506] INFO [Controller 1]: Partitions undergoing > preferred replica election: (kafka.controller.KafkaController) > [2014-04-02 10:42:21,515] INFO [Controller 1]: Partitions that > completed preferred replica election: > (kafka.controller.KafkaController) > [2014-04-02 10:42:21,516] INFO [Controller 1]: Resuming preferred > replica election for partitions: (kafka.controller.KafkaController) > [2014-04-02 10:42:21,653] INFO [Controller 1]: Partitions being > reassigned: Map() (kafka.controller.KafkaController) > [2014-04-02 10:42:21,655] INFO [Controller 1]: Partitions already > reassigned: List() (kafka.controller.KafkaController) > [2014-04-02 10:42:21,656] INFO [Controller 1]: Resuming reassignment > of partitions: Map() (kafka.controller.KafkaController) > [2014-04-02 10:42:21,742] INFO [Controller 1]: List of topics to be > deleted: (kafka.controller.KafkaController) > [2014-04-02 10:42:21,743] INFO [Controller 1]: List of topics > ineligible for deletion: topic1,topic2,topic3 > (kafka.controller.KafkaController) > [2014-04-02 10:42:21,848] INFO [Controller 1]: Currently active > brokers in the cluster: Set(1, 3) (kafka.controller.KafkaController) > [2014-04-02 10:42:21,849] INFO [Controller 1]: Currently shutting > brokers in the cluster: Set() (kafka.controller.KafkaController) > > After failover, Controller is on machine 1 and broker ID=2 disappeared > in Zookeeper: > ls /brokers/ids > [3, 1] > > Only restart broker ID=2 helps in order to back. My questionis: > Why broker is not able to back and works? > (I see problem with the bad version in Zookeeper but I would like to > better understand it and prevent in future) > > Thanks, > Chris > > > -- -- Guozhang