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From vjavarap <>
Subject ActiveMQ 5.1.0 and 5.2.0 runs out of file descriptors due to CLOSE_WAIT bug
Date Fri, 27 Feb 2009 22:54:23 GMT

We have been experiencing severe issues with ActiveMQ 5.1.0 running out of
file descriptors and netstat reveals thousands of tcp connections stuck in
CLOSE_WAIT within a few minutes or hours or days of starting up based on the
event volume.

Clearly, other activemq users are seeing the same issue:

The ActiveMQ runs on a Linux (CentOS) server. We are using stomp as the
transport connector and production and consumption are via PHP clients.

Problem Definition
- When we add thousands of events onto the queue with no consumption, the
events are registered and things work well.
- When events are consumed later when no events are being added at the same
time, things work smoothly.
- However, when events are being added and consumed at the same time, the
CLOSE_WAITs shoot up into the thousands (or tens of thousands) based on
event activity.

We have tried upgrading to ActiveMQ 5.2.0 and having this in the config:

<transportConnector name="stomp"

Once the CLOSE_WAITs shoot up into the thousands, the event queue stops
accepting events.

I've set the ulimit for open files to 32K and we are nowhere close to the
upper limit.

Any thoughts?
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