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https://issues.apache.org/jira/browse/KAFKA-8532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16863673#comment-16863673
]
leibo commented on KAFKA-8532:
------------------------------
[~junrao] Thank you for your reply.
Because we need to recovery the kafka cluster ,so we have restart the kafka
server.
Follows is my today's analysis:
I noticed when expiryScheduler connect zookeeper server failed, it will throw
exception immediately as follow code:
{code:java}
//代码占位符
expiryScheduler.startup()
try waitUntilConnected(connectionTimeoutMs, TimeUnit.MILLISECONDS)
catch {
case e: Throwable =>
close()
throw e
}{code}
close()
{code:java}
//代码占位符
def close(): Unit = {
info("Closing.")
inWriteLock(initializationLock) {
zNodeChangeHandlers.clear()
zNodeChildChangeHandlers.clear()
stateChangeHandlers.clear()
zooKeeper.close()
metricNames.foreach(removeMetric(_))
}
// Shutdown scheduler outside of lock to avoid deadlock if scheduler
// is waiting for lock to process session expiry
expiryScheduler.shutdown()
info("Closed.")
}
{code}
expiryScheduler.shutdown()
{code:java}
//代码占位符
override def shutdown() {
debug("Shutting down task scheduler.")
// We use the local variable to avoid NullPointerException if another thread
shuts down scheduler at same time.
val cachedExecutor = this.executor
if (cachedExecutor != null) {
this synchronized {
cachedExecutor.shutdown()
this.executor = null
}
cachedExecutor.awaitTermination(1, TimeUnit.DAYS)
}
}
{code}
{color:#ff0000}we see expiryScheduler.shutdown() may execute timeout *1 day* ,
it too long.{color}
{color:#333333}I remember that there are no zookeeper connection or heartbeat
log in the server.log in 1 day when the issue occurred.{color}
{color:#333333}I wonder if shutdown() continued for 1 day, the zookeeper
instance will not be {color}reinitialize ?{color:#333333} {color}
> controller-event-thread deadlock with zk-session-expiry-handler0
> ----------------------------------------------------------------
>
> Key: KAFKA-8532
> URL: https://issues.apache.org/jira/browse/KAFKA-8532
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 2.1.1
> Reporter: leibo
> Priority: Blocker
> Attachments: js.log
>
>
> We have observed a serious deadlock between controller-event-thead and
> zk-session-expirey-handle thread. When this issue occurred, it's only one way
> to recovery the kafka cluster is restart kafka server. The follows is the
> jstack log of controller-event-thead and zk-session-expiry-handle thread.
> "zk-session-expiry-handler0" #163089 daemon prio=5 os_prio=0
> tid=0x00007fcc9c010000 nid=0xfb22 waiting on condition [0x00007fcbb01f8000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000005ee3f7000> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231) //
> 等待controller-event-thread线程处理expireEvent
> at
> kafka.controller.KafkaController$Expire.waitUntilProcessingStarted(KafkaController.scala:1533)
> at
> kafka.controller.KafkaController$$anon$7.beforeInitializingSession(KafkaController.scala:173)
> at
> kafka.zookeeper.ZooKeeperClient.callBeforeInitializingSession(ZooKeeperClient.scala:408)
> at
> kafka.zookeeper.ZooKeeperClient.$anonfun$reinitialize$1(ZooKeeperClient.scala:374)
> at
> kafka.zookeeper.ZooKeeperClient.$anonfun$reinitialize$1$adapted(ZooKeeperClient.scala:374)
> at kafka.zookeeper.ZooKeeperClient$$Lambda$1473/1823438251.apply(Unknown
> Source)
> at scala.collection.Iterator.foreach(Iterator.scala:937)
> at scala.collection.Iterator.foreach$(Iterator.scala:937)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1425)
> at scala.collection.MapLike$DefaultValuesIterable.foreach(MapLike.scala:209)
> at kafka.zookeeper.ZooKeeperClient.reinitialize(ZooKeeperClient.scala:374)
> at
> kafka.zookeeper.ZooKeeperClient.$anonfun$scheduleSessionExpiryHandler$1(ZooKeeperClient.scala:428)
> at
> kafka.zookeeper.ZooKeeperClient$$Lambda$1471/701792920.apply$mcV$sp(Unknown
> Source)
> at kafka.utils.KafkaScheduler.$anonfun$schedule$2(KafkaScheduler.scala:114)
> at kafka.utils.KafkaScheduler$$Lambda$198/1048098469.apply$mcV$sp(Unknown
> Source)
> at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:63)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Locked ownable synchronizers:
> - <0x0000000661e8d2e0> (a java.util.concurrent.ThreadPoolExecutor$Worker)
> "controller-event-thread" #51 prio=5 os_prio=0 tid=0x00007fceaeec4000
> nid=0x310 waiting on condition [0x00007fccb55c8000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000005d1be5a00> (a
> java.util.concurrent.CountDownLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at kafka.zookeeper.ZooKeeperClient.handleRequests(ZooKeeperClient.scala:157)
> at
> kafka.zk.KafkaZkClient.retryRequestsUntilConnected(KafkaZkClient.scala:1596)
> at
> kafka.zk.KafkaZkClient.kafka$zk$KafkaZkClient$$retryRequestUntilConnected(KafkaZkClient.scala:1589)
> at
> kafka.zk.KafkaZkClient.deletePreferredReplicaElection(KafkaZkClient.scala:989)
> at
> kafka.controller.KafkaController.removePartitionsFromPreferredReplicaElection(KafkaController.scala:873)
> at
> kafka.controller.KafkaController.kafka$controller$KafkaController$$onPreferredReplicaElection(KafkaController.scala:631)
> at
> kafka.controller.KafkaController.onControllerFailover(KafkaController.scala:266)
> at
> kafka.controller.KafkaController.kafka$controller$KafkaController$$elect(KafkaController.scala:1221)
> at
> kafka.controller.KafkaController$Reelect$.process(KafkaController.scala:1508)
> at
> kafka.controller.KafkaController$RegisterBrokerAndReelect$.process(KafkaController.scala:1517)
> at
> kafka.controller.ControllerEventManager$ControllerEventThread.$anonfun$doWork$1(ControllerEventManager.scala:89)
> at
> kafka.controller.ControllerEventManager$ControllerEventThread$$Lambda$362/918424570.apply$mcV$sp(Unknown
> Source)
> at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
> at kafka.metrics.KafkaTimer.time(KafkaTimer.scala:31)
> at
> kafka.controller.ControllerEventManager$ControllerEventThread.doWork(ControllerEventManager.scala:89)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:82)
> Locked ownable synchronizers:
> - None
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