[rabbitmq-discuss] BrokerUnrechableException after sending 16366 messages
simon at rabbitmq.com
Fri Oct 21 16:22:55 BST 2011
On 21/10/11 16:14, James Carr wrote:
> One "newb" mistake I often see when devs are initially testing out our
> dev cluster is they open a connection for each message they send
> rather than opening one connection and re-using it. This will quickly
> use up all the connections on the box and rabbitmq will begin refusing
> additional requests to connect.
You should be fine of course as long as you are *closing* those
connections too. RabbitMQ will only refuse connections when you have too
many active ones.
If you churn through connections at a frantic rate, you can get into a
state where the entire *client* box can't make outgoing connections for
a while, as all your ports in the ephemeral port range still have the
remains of an old connection sitting there in the TCP_WAIT state.
If you run into this it's usually a sign that you should be a bit more
economical with connections (to put it mildly), but on Linux at least
you can work around it with:
# echo "1" >/proc/sys/net/ipv4/tcp_tw_reuse
# echo "1" >/proc/sys/net/ipv4/tcp_tw_recycle
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