Hi.
currently we are using *kafka_2.8.0-0.8.0-beta1 and *and high level
consumer group to consume messages. Topic has been created with 3 replica
and 100 partition so that max 100 threads can consume messages
simultaneously, but i am seeing that mostly threads are in waiting state
and lag is getting increased.
Below is output of *kafka-run-class.sh kafka.tools.ConsumerOffsetChecker*
Group Topic Pid Offset logSize
Lag Owner
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
0 1030308 1081657 51349
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-0
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
1 348475 460598 112123
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-0
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
2 296231 461154 164923
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-1
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
3 1040848 1094389 53541
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-1
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
4 398706 460787 62081
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-10
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
5 330990 461085 130095
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-10
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
6 1046217 1093952 47735
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-11
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
7 348592 461147 112555
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-11
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
8 341237 460094 118857
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-12
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
9 1046635 1094724 48089
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-12
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
10 407063 461124 54061
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-13
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.comkafka_topic_coms_esb_prod_coms
11 329498 460666 131168
kafka.coms.consumer.kafka_topic_coms_esb_prod_coms.coms-timemachine.coms.coms04.snapdeal.com_coms04.snapdeal.com-1397482483587-832c7c25-13
Below is out put of *consumer thread group's thread_dump*
*KafkaConsumer-24" prio=10 tid=0x00007f6da5726800 nid=0x3c8a waiting on
condition [0x00007f6d4f8f7000] java.lang.Thread.State: WAITING (parking) at
sun.misc.Unsafe.park(Native Method) - parking to wait for
<0x00000006c11ce780> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at
java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
at
java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
at kafka.consumer.ConsumerIterator.makeNext(ConsumerIterator.scala:63) at
kafka.consumer.ConsumerIterator.makeNext(ConsumerIterator.scala:33) at
kafka.utils.IteratorTemplate.maybeComputeNext(IteratorTemplate.scala:61) at
kafka.utils.IteratorTemplate.hasNext(IteratorTemplate.scala:53) at
com.snapdeal.coms.kafka.KafkaEventListenerContainer$KafkaConsumer.safeRun(KafkaEventListenerContainer.java:141)
at
com.snapdeal.coms.kafka.KafkaEventListenerContainer$KafkaConsumer.run(KafkaEventListenerContainer.java:175)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at
java.util.concurrent.FutureTask.run(FutureTask.java:166) at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722) "KafkaConsumer-23" prio=10
tid=0x00007f6da5724000 nid=0x3c89 waiting on condition [0x00007f6d4f9f8000]
java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native
Method) - parking to wait for <0x00000006c11cde90> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at
java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
at
java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
at kafka.consumer.ConsumerIterator.makeNext(ConsumerIterator.scala:63) at
kafka.consumer.ConsumerIterator.makeNext(ConsumerIterator.scala:33) at
kafka.utils.IteratorTemplate.maybeComputeNext(IteratorTemplate.scala:61) at
kafka.utils.IteratorTemplate.hasNext(IteratorTemplate.scala:53) at
com.snapdeal.coms.kafka.KafkaEventListenerContainer$KafkaConsumer.safeRun(KafkaEventListenerContainer.java:141)
at
com.snapdeal.coms.kafka.KafkaEventListenerContainer$KafkaConsumer.run(KafkaEventListenerContainer.java:175)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at
java.util.concurrent.FutureTask.run(FutureTask.java:166) at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)*
*I am not sure why my consumer thread's are waiting on this condition if
messages are available in kafka partition.*
