CODEWITHSUNDEEP
websocketplayframeworkakkaakka-http
jaakash
jaakash

Reputation: 173

How to increase concurrent websocket connections in play framework

I am setting up a play framework based server where I want to accept a huge number of concurrent websocket connections. In terms of resources, I don't see any bottleneck but my server always maxes out at 4k connections.

I am using a 2core/8gb centos 7 machine and have also bumped up the file descriptor count to 1000000.

/etc/security/limits.conf:

process_username soft nofile 1000000"

process_username hard nofile 1000000

After 4k connections, I see that it can't accept any new connections. [logger="akka.io.TcpListener"] Accept error: could not accept new connection java.io.IOException: Too many open files

Is there any configuration/setting in play's akka http server that is prohibiting large number of websocket connections?

Upvotes: 0

Views: 414

Answers (1)

jaakash
jaakash

Reputation: 173

I found out. The issue was that FD values from ulimits will not be honored if the program is started as a systemd service.

In order to fix this add below attribute to the systemd unit file

[Service]

LimitNOFILE=100000 (if you want unlimited you can also use "infinity")

Upvotes: 1

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