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From Netlancer <netlan...@mobigraph.co>
Subject ActiveMQ JVM crashes when high number of concurrent connections get terminated
Date Mon, 02 Jun 2014 03:06:40 GMT
Hi,

  We have activemq running behind an LB.  we have close to 55K 
connections to activemq. during cases of more than 1000 connections gets 
terminated concurrently, we observe a huge spike in the number of 
threads created.following which the jvm crashes. on further 
investigation, these threads are pertained to executors

SelectorManager - defaultExecutor - labelled with "ActiveMQ NIO Worker" 
- the executor has maximum thread pool size of Integer.MAX_VALUE
TaskRunnerFactory - defaultExecutor - labelled as "ActiveMQ Task" - this 
executor as well has Integer.MAX_VALUE as the max pool size.
BrokerService.getTaskRunnerFactory - labelled as "ActiveMQ 
BrokerService[%s] Task-" - this executor is also created with 
Integer.MAX_VALUE

the configured persistence store is leveldb and dedicatedtaskrunner is 
disabled. The JVM is running with 8GB RAM with the max heap at 5G.

following snippet from the hs_pid crash file

Java Threads: ( => current thread )
   0x00007f1e42863800 JavaThread "ActiveMQ NIO Worker 9053" daemon 
[_thread_blocked, id=10690, stack(0x00007f1d6fa53000,0x00007f1d6fa8c000)]
   0x00007f1ea40dc000 JavaThread "ActiveMQ NIO Worker 9047" daemon 
[_thread_blocked, id=10689, stack(0x00007f1d6fa8c000,0x00007f1d6fac5000)]
   0x00007f1eac116800 JavaThread "ActiveMQ NIO Worker 9054" daemon 
[_thread_blocked, id=10688, stack(0x00007f1d6fac5000,0x00007f1d6fafe000)]
   0x00007f1df43f5800 JavaThread "ActiveMQ NIO Worker 9046" daemon 
[_thread_blocked, id=10687, stack(0x00007f1d6fafe000,0x00007f1d6fb37000)]
   0x00007f1e42870000 JavaThread "ActiveMQ NIO Worker 9056" daemon 
[_thread_blocked, id=10686, stack(0x00007f1d6fb37000,0x00007f1d6fb70000)]
   0x00007f1ef6054800 JavaThread "ActiveMQ NIO Worker 9107" daemon 
[_thread_blocked, id=10685, stack(0x00007f1d6fb70000,0x00007f1d6fba9000)]
   0x00007f1ef46af800 JavaThread "ActiveMQ NIO Worker 9059" daemon 
[_thread_blocked, id=10684, stack(0x00007f1d6fba9000,0x00007f1d6fbe2000)]
   0x00007f1e240cd000 JavaThread "ActiveMQ NIO Worker 9041" daemon 
[_thread_blocked, id=10683, stack(0x00007f1d6fbe2000,0x00007f1d6fc1b000)]
   0x00007f1e0016a800 JavaThread "ActiveMQ NIO Worker 9060" daemon 
[_thread_blocked, id=10682, stack(0x00007f1d6fc1b000,0x00007f1d6fc54000)]
   0x00007f1e5019d800 JavaThread "ActiveMQ NIO Worker 9061" daemon 
[_thread_blocked, id=10681, stack(0x00007f1d6fc54000,0x00007f1d6fc8d000)]
   0x00007f1e8006f000 JavaThread "ActiveMQ NIO Worker 9039" daemon 
[_thread_blocked, id=10680, stack(0x00007f1d6fc8d000,0x00007f1d6fcc6000)]
   0x00007f1e4c7df800 JavaThread "ActiveMQ NIO Worker 9101" daemon 
[_thread_blocked, id=10679, stack(0x00007f1d6fcc6000,0x00007f1d6fcff000)]

   0x00007f1da6794800 JavaThread "ActiveMQ BrokerService[MQMaster] 
Task-1781" daemon [_thread_blocked, id=8302, 
stack(0x00007f1db5a51000,0x00007f1db5a8a000)]
   0x00007f1da6791000 JavaThread "ActiveMQ BrokerService[MQMaster] 
Task-1780" daemon [_thread_blocked, id=8298, 
stack(0x00007f1dc6d4c000,0x00007f1dc6d85000)]
   0x00007f1da6793000 JavaThread "ActiveMQ BrokerService[MQMaster] 
Task-1779" daemon [_thread_blocked, id=8296, 
stack(0x00007f1dc6e30000,0x00007f1dc6e69000)]
   0x00007f1da6790000 JavaThread "ActiveMQ BrokerService[MQMaster] 
Task-1778" daemon [_thread_blocked, id=8293, 
stack(0x00007f1db6903000,0x00007f1db693c000)]
   0x00007f1da678f000 JavaThread "ActiveMQ BrokerService[MQMaster] 
Task-1777" daemon [_thread_blocked, id=8292, 
stack(0x00007f1db9dc8000,0x00007f1db9e01000)]

Please, can someone provide inputs on why this is happening.

Thanks
nl



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