James Blackburn created KAFKA-1415:
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Summary: Async producer.send can block forever if
async.ProducerSendThread dies
Key: KAFKA-1415
URL: https://issues.apache.org/jira/browse/KAFKA-1415
Project: Kafka
Issue Type: Bug
Components: clients, producer
Affects Versions: 0.8.0
Environment: kafka_2.9.2-0.8.0.jar
Reporter: James Blackburn
Assignee: Jun Rao
We noticed that if something goes fundamentally wrong (in this case the jars
were replaced under a running Producer's feet) then async calls to:
{{producer.send}} can lockup forever.
I saw in the log file the following exception logged:
{code}
[2014-04-17 16:45:36,484] INFO Disconnecting from cn2:9092
(kafka.producer.SyncProducer)
Exception in thread "ProducerSendThread-" java.lang.NoClassDefFoundError:
kafka/producer/async/ProducerSendThread$$anonfun$run$1
at
kafka.producer.async.ProducerSendThread.run(ProducerSendThread.scala:46)
Caused by: java.lang.ClassNotFoundException:
kafka.producer.async.ProducerSendThread$$anonfun$run$1
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more
{code}
However my application continued running. Jstack showed that the producer.send
calls had all locked up:
{code}
"SubscriberEventQueue0Executor-1" prio=10 tid=0x00002aaab0a88000 nid=0x44f5
waiting on condition [0x0000000044ac4000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x0000000790c47918> (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.put(LinkedBlockingQueue.java:349)
at kafka.producer.Producer$$anonfun$asyncSend$1.apply(Producer.scala:98)
at kafka.producer.Producer$$anonfun$asyncSend$1.apply(Producer.scala:90)
at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:34)
at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:33)
at kafka.producer.Producer.asyncSend(Producer.scala:90)
at kafka.producer.Producer.send(Producer.scala:77)
- locked <0x0000000791768ee8> (a java.lang.Object)
at kafka.javaapi.producer.Producer.send(Producer.scala:33)
at com.mi.ahl.kafka.rmds2kafka.Bridge$1.onMarketData(Bridge.java:165)
Locked ownable synchronizers:
- <0x0000000792205cd0> (a
java.util.concurrent.ThreadPoolExecutor$Worker)
"SubscriberEventQueue1Executor-2" prio=10 tid=0x00002aaab0aa0000 nid=0x4511
waiting for monitor entry [0x0000000044dc7000]
java.lang.Thread.State: BLOCKED (on object monitor)
at kafka.producer.Producer.send(Producer.scala:71)
- waiting to lock <0x0000000791768ee8> (a java.lang.Object)
at kafka.javaapi.producer.Producer.send(Producer.scala:33)
at com.mi.ahl.kafka.rmds2kafka.Bridge$1.onMarketData(Bridge.java:165)
"SubscriberEventQueue2Executor-3" prio=10 tid=0x00002aaab0ab6800 nid=0x4512
waiting for monitor entry [0x0000000044ec8000]
java.lang.Thread.State: BLOCKED (on object monitor)
at kafka.producer.Producer.send(Producer.scala:71)
- waiting to lock <0x0000000791768ee8> (a java.lang.Object)
at kafka.javaapi.producer.Producer.send(Producer.scala:33)
at com.mi.ahl.kafka.rmds2kafka.Bridge$1.onMarketData(Bridge.java:165)
"SubscriberEventQueue3Executor-4" prio=10 tid=0x00002aaab0ab8800 nid=0x4513
waiting for monitor entry [0x0000000044fc9000]
java.lang.Thread.State: BLOCKED (on object monitor)
at kafka.producer.Producer.send(Producer.scala:71)
- waiting to lock <0x0000000791768ee8> (a java.lang.Object)
at kafka.javaapi.producer.Producer.send(Producer.scala:33)
at com.mi.ahl.kafka.rmds2kafka.Bridge$1.onMarketData(Bridge.java:165)
{code}
*Expectation:*
{{producer.send}} would raise if something had fundamentally broken within the
client rather than hanging forever.
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