[KAFKA-709] Default queue.enqueue.timeout.ms to -1

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Component/s: producer
• Assignee: Neha Narkhede
• Reporter: Chris Riccomini
• Created: 17/Jan/13 02:11
• Updated: 21/Jan/13 03:15
• Resolved: 18/Jan/13 05:31

Description

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.