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https://issues.apache.org/jira/browse/KAFKA-664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528713#comment-13528713
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Neha Narkhede commented on KAFKA-664:
-------------------------------------
For the current implementation, that is true only for the DelayQueue but not
for the watchersForKey map. The memory consumption keeps on increasing because
we never circle around to cleaning up the entries in the map. When entries are
satisfied/expired, they only exit the queue and are "marked" as
expired/satisfied.
> Kafka server threads die due to OOME during long running test
> -------------------------------------------------------------
>
> Key: KAFKA-664
> URL: https://issues.apache.org/jira/browse/KAFKA-664
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Neha Narkhede
> Assignee: Jay Kreps
> Priority: Blocker
> Labels: bugs
> Fix For: 0.8
>
> Attachments: kafka-664-draft-2.patch, kafka-664-draft.patch, Screen
> Shot 2012-12-09 at 11.22.50 AM.png, Screen Shot 2012-12-09 at 11.23.09
> AM.png, Screen Shot 2012-12-09 at 11.31.29 AM.png, thread-dump.log,
> watchersForKey.png
>
>
> I set up a Kafka cluster with 5 brokers (JVM memory 512M) and set up a long
> running producer process that sends data to 100s of partitions continuously
> for ~15 hours. After ~4 hours of operation, few server threads (acceptor and
> processor) exited due to OOME -
> [2012-12-07 08:24:44,355] ERROR OOME with size 1700161893
> (kafka.network.BoundedByteBufferReceive)
> java.lang.OutOfMemoryError: Java heap space
> [2012-12-07 08:24:44,356] ERROR Uncaught exception in thread
> 'kafka-acceptor': (kafka.utils.Utils$)
> java.lang.OutOfMemoryError: Java heap space
> [2012-12-07 08:24:44,356] ERROR Uncaught exception in thread
> 'kafka-processor-9092-1': (kafka.utils.Utils$)
> java.lang.OutOfMemoryError: Java heap space
> [2012-12-07 08:24:46,344] INFO Unable to reconnect to ZooKeeper service,
> session 0x13afd0753870103 has expired, closing socket connection
> (org.apache.zookeeper.ClientCnxn)
> [2012-12-07 08:24:46,344] INFO zookeeper state changed (Expired)
> (org.I0Itec.zkclient.ZkClient)
> [2012-12-07 08:24:46,344] INFO Initiating client connection,
> connectString=eat1-app309.corp:12913,eat1-app310.corp:12913,eat1-app311.corp:12913,eat1-app312.corp:12913,eat1-app313.corp:12913
> sessionTimeout=15000 watcher=org.I0Itec.zkclient.ZkClient@19202d69
> (org.apache.zookeeper.ZooKeeper)
> [2012-12-07 08:24:55,702] ERROR OOME with size 2001040997
> (kafka.network.BoundedByteBufferReceive)
> java.lang.OutOfMemoryError: Java heap space
> [2012-12-07 08:25:01,192] ERROR Uncaught exception in thread
> 'kafka-request-handler-0': (kafka.utils.Utils$)
> java.lang.OutOfMemoryError: Java heap space
> [2012-12-07 08:25:08,739] INFO Opening socket connection to server
> eat1-app311.corp/172.20.72.75:12913 (org.apache.zookeeper.ClientCnxn)
> [2012-12-07 08:25:14,221] INFO Socket connection established to
> eat1-app311.corp/172.20.72.75:12913, initiating session
> (org.apache.zookeeper.ClientCnxn)
> [2012-12-07 08:25:17,943] INFO Client session timed out, have not heard from
> server in 3722ms for sessionid 0x0, closing socket connection and attempting
> reconnect (org.apache.zookeeper.ClientCnxn)
> [2012-12-07 08:25:19,805] ERROR error in loggedRunnable (kafka.utils.Utils$)
> java.lang.OutOfMemoryError: Java heap space
> [2012-12-07 08:25:23,528] ERROR OOME with size 1853095936
> (kafka.network.BoundedByteBufferReceive)
> java.lang.OutOfMemoryError: Java heap space
> It seems like it runs out of memory while trying to read the producer
> request, but its unclear so far.
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