I have increased the partition for parallelism but my concern is , if message are present in partition then why consumer thread are blocked at below condition.
*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)* On Tue, Apr 15, 2014 at 11:53 AM, Arjun <ar...@socialtwist.com> wrote: > Hi, > > Can you please check weather this is the situation > > > https://cwiki.apache.org/confluence/display/KAFKA/FAQ#FAQ-Myconsumerseemstohavestopped,why? > > Arjun Kota > > > On Tuesday 15 April 2014 11:49 AM, ankit tyagi wrote: > > 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.* > > > >
