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From Gaurav Sharma <gaurav.cs.sha...@gmail.com>
Subject Re: ActiveMQ JVM crashes when high number of concurrent connections get terminated
Date Mon, 02 Jun 2014 03:22:30 GMT
If possible, pls provide some more info to help diagnose this. What's the output of /etc/security/limits.conf
and file-max value in /etc/sysctl.conf?

Is 5G the max you can allocate to amq's jvm?

Sent from my iPhone

On Jun 1, 2014, at 20:06, Netlancer <netlancer@mobigraph.co> wrote:

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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