[jira] [Created] (KAFKA-1636) High CPU in very active environment

[Laurie Turner (JIRA)]

Laurie Turner created KAFKA-1636:
------------------------------------

             Summary: High CPU in very active environment
                 Key: KAFKA-1636
                 URL: https://issues.apache.org/jira/browse/KAFKA-1636
             Project: Kafka
          Issue Type: Bug
          Components: consumer
    Affects Versions: 0.8.0
         Environment: Redhat 64 bit
 2.6.32-431.23.3.el6.x86_64 #1 SMP Wed Jul 16 06:12:23 EDT 2014 x86_64 x86_64 
x86_64 GNU/Linux

            Reporter: Laurie Turner
            Assignee: Neha Narkhede


Found the same issue on StackOverFlow below:

http://stackoverflow.com/questions/22983435/kafka-consumer-threads-are-in-waiting-state-and-lag-is-getting-increased

This is a very busy environment and the majority of the CPU seems to be busy in 
the in the await method. 


3XMTHREADINFO3           Java callstack:
4XESTACKTRACE                at sun/misc/Unsafe.park(Native Method)
4XESTACKTRACE                at 
java/util/concurrent/locks/LockSupport.parkNanos(LockSupport.java:237(Compiled 
Code))
4XESTACKTRACE                at 
java/util/concurrent/locks/AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2093(Compiled
 Code))
4XESTACKTRACE                at 
java/util/concurrent/LinkedBlockingQueue.poll(LinkedBlockingQueue.java:478(Compiled
 Code))
4XESTACKTRACE                at 
kafka/consumer/ConsumerIterator.makeNext(ConsumerIterator.scala:65(Compiled 
Code))
4XESTACKTRACE                at 
kafka/consumer/ConsumerIterator.makeNext(ConsumerIterator.scala:33(Compiled 
Code))
4XESTACKTRACE                at 
kafka/utils/IteratorTemplate.maybeComputeNext(IteratorTemplate.scala:61(Compiled
 Code))
4XESTACKTRACE                at 
kafka/utils/IteratorTemplate.hasNext(IteratorTemplate.scala:53(Compiled Code))



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