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https://issues.apache.org/jira/browse/KAFKA-3689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15312945#comment-15312945
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Buvaneswari Ramanan commented on KAFKA-3689:
--------------------------------------------
All connections are shown to be in ESTABLISHED state.
Here is the scenario under which this arises:
* 8000 producers & 16000 consumers, all utilizing kafka-python library
* brokers go thru abnormal shutdown - easy way to create this scenario:
* clean shutdown all the zookeepers while brokers are running
* await for the following message in broker log: INFO [Kafka Server ],
shutting down (kafka.server.KafkaServer).
As you are probably aware, even though they start the shutdown,
the process takes a while.
& brokers will continue to be on until zks are back.
* now restart zks so that brokers will shutdown eventually
* now start brokers
* network.Processor error message appears in atleast one of the brokers within
a few hours
netstat shows all connections to be ESTABLISHED at the broker end.
> ERROR Processor got uncaught exception. (kafka.network.Processor)
> -----------------------------------------------------------------
>
> Key: KAFKA-3689
> URL: https://issues.apache.org/jira/browse/KAFKA-3689
> Project: Kafka
> Issue Type: Bug
> Components: network
> Affects Versions: 0.9.0.1
> Environment: ubuntu 14.04,
> java version "1.7.0_95"
> OpenJDK Runtime Environment (IcedTea 2.6.4) (7u95-2.6.4-0ubuntu0.14.04.2)
> OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode)
> 3 broker cluster (all 3 servers identical - Intel Xeon E5-2670 @2.6GHz,
> 8cores, 16 threads 64 GB RAM & 1 TB Disk)
> Kafka Cluster is managed by 3 server ZK cluster (these servers are different
> from Kafka broker servers). All 6 servers are connected via 10G switch.
> Producers run from external servers.
> Reporter: Buvaneswari Ramanan
> Assignee: Jun Rao
> Priority: Minor
> Fix For: 0.10.1.0, 0.10.0.1
>
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> As per Ismael Juma's suggestion in email thread to us...@kafka.apache.org
> with the same subject, I am creating this bug report.
> The following error occurs in one of the brokers in our 3 broker cluster,
> which serves about 8000 topics. These topics are single partitioned with a
> replication factor = 3. Each topic gets data at a low rate – 200 bytes per
> sec. Leaders are balanced across the topics.
> Producers run from external servers (4 Ubuntu servers with same config as the
> brokers), each producing to 2000 topics utilizing kafka-python library.
> This error message occurs repeatedly in one of the servers. Between the hours
> of 10:30am and 1:30pm on 5/9/16, there were about 10 Million such
> occurrences. This was right after a cluster restart.
> This is not the first time we got this error in this broker. In those
> instances, error occurred hours / days after cluster restart.
> =====================================================
> [2016-05-09 10:38:43,932] ERROR Processor got uncaught exception.
> (kafka.network.Processor)
> java.lang.IllegalArgumentException: Attempted to decrease connection count
> for address with no connections, address: /X.Y.Z.144 (actual network address
> masked)
> at
> kafka.network.ConnectionQuotas$$anonfun$9.apply(SocketServer.scala:565)
> at
> kafka.network.ConnectionQuotas$$anonfun$9.apply(SocketServer.scala:565)
> at scala.collection.MapLike$class.getOrElse(MapLike.scala:128)
> at scala.collection.AbstractMap.getOrElse(Map.scala:59)
> at kafka.network.ConnectionQuotas.dec(SocketServer.scala:564)
> at
> kafka.network.Processor$$anonfun$run$13.apply(SocketServer.scala:450)
> at
> kafka.network.Processor$$anonfun$run$13.apply(SocketServer.scala:445)
> at scala.collection.Iterator$class.foreach(Iterator.scala:742)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1194)
> at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
> at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
> at kafka.network.Processor.run(SocketServer.scala:445)
> at java.lang.Thread.run(Thread.java:745)
> [2016-05-09 10:38:43,932] ERROR Processor got uncaught exception.
> (kafka.network.Processor)
> java.lang.IllegalArgumentException: Attempted to decrease connection count
> for address with no connections, address: /X.Y.Z.144
> at
> kafka.network.ConnectionQuotas$$anonfun$9.apply(SocketServer.scala:565)
> at
> kafka.network.ConnectionQuotas$$anonfun$9.apply(SocketServer.scala:565)
> at scala.collection.MapLike$class.getOrElse(MapLike.scala:128)
> at scala.collection.AbstractMap.getOrElse(Map.scala:59)
> at kafka.network.ConnectionQuotas.dec(SocketServer.scala:564)
> at
> kafka.network.Processor$$anonfun$run$13.apply(SocketServer.scala:450)
> at
> kafka.network.Processor$$anonfun$run$13.apply(SocketServer.scala:445)
> at scala.collection.Iterator$class.foreach(Iterator.scala:742)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1194)
> at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
> at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
> at kafka.network.Processor.run(SocketServer.scala:445)
> at java.lang.Thread.run(Thread.java:745)
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