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From "Chris Riccomini (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-709) Default queue.enqueue.timeout.ms to -1
Date Thu, 17 Jan 2013 02:12:22 GMT
Chris Riccomini created KAFKA-709:

             Summary: Default queue.enqueue.timeout.ms to -1
                 Key: KAFKA-709
                 URL: https://issues.apache.org/jira/browse/KAFKA-709
             Project: Kafka
          Issue Type: Bug
          Components: producer 
    Affects Versions: 0.8
            Reporter: Chris Riccomini
            Assignee: Jun Rao

Hey Guys,

It seems that, by default, producers in 0.8 are async, and have a default queue.enqueue.timeout.ms
of 0. This means that anyone who reads messages faster than they're producing them will likely
end up eventually hitting this exception:

Exception in thread "Thread-3" kafka.common.QueueFullException: Event queue is full of unsent
messages, could not send event: KeyedMessage(PageViewEventByGroupJson,Missing Page Group,java.nio.HeapByteBuffer[pos=0
lim=125 cap=125])
        at kafka.producer.Producer$$anonfun$asyncSend$1.apply(Producer.scala:111)
        at kafka.producer.Producer$$anonfun$asyncSend$1.apply(Producer.scala:89)
        at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:34)
        at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:32)
        at kafka.producer.Producer.asyncSend(Producer.scala:89)
        at kafka.producer.Producer.send(Producer.scala:77)

As it says in https://cwiki.apache.org/KAFKA/kafka-mirroring.html, this can result in losing
messages, and nasty exceptions in the logs. I think the better default is setting queue.enqueue.timeout.ms
to -1, which will just block until the queue frees up.

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