On Tue, Jul 17, 2012 at 6:07 PM, Romain <[email protected]> wrote:
> Hi,
>
> I have a script in node-js that do a lot of http requests.
>
> After 30s, I did 30 000 requests, and I start having errors : `connect
> EHOSTUNREACH` and `getaddrinfo ENOENT`
>
> The command `netstat -putone` tell me that there are a lot of sockets in
> TIME_WAIT state:
>
> ...
> tcp 0 0 10.26.164.13:50180 10.26.165.15:9023
> TIME_WAIT 0 0 - timewait (0.00/0/0)
> tcp 0 0 10.26.164.13:57571 10.26.165.14:9023
> TIME_WAIT 0 0 - timewait (0.00/0/0)
> tcp 0 0 10.26.164.13:59341 10.26.165.14:9023
> TIME_WAIT 0 0 - timewait (0.14/0/0)
> tcp 0 0 10.26.164.13:50219 10.26.165.15:9023
> TIME_WAIT 0 0 - timewait (0.00/0/0)
> tcp 0 0 10.26.164.13:41825 10.26.165.16:9023
> TIME_WAIT 0 0 - timewait (0.00/0/0)
> tcp 0 0 10.26.164.13:57264 10.26.165.14:9023
> TIME_WAIT 0 0 - timewait (0.00/0/0)
> tcp 0 0 10.26.164.13:41151 10.26.165.16:9023
> TIME_WAIT 0 0 - timewait (0.00/0/0)
> ...
>
>
> $ netstat -putone |grep TIME_WAIT |wc -l
> 31413
>
>
> Is there a way to tell the OS to reuse the sockets in TIME_WAIT state ?
> I read docs about SO_REUSE_ADDR :
> http://www.unixguide.net/network/socketfaq/4.5.shtml, and it's looks what I
> need.
>
> Now I am wondering how to pass this option to the tcp socket.
>
> But a grep told me that SO_REUSE_ADDR is used in lib_uv.
> https://github.com/joyent/node/blob/master/deps/uv/src/unix/stream.c#L90
libuv sets it but it's called SO_REUSEADDR, that's why you didn't find it.
The TIME_WAIT timeout is configurable on most operating systems, see
`man 7 tcp` (on Linux) for details.
I would generally advise against changing the defaults, though.
There's a 50/50 chance that your tweaks will have an adverse impact
and that may not be evident until much, much later - at a time when
you've forgotten all about this gentle warning. :-)
> I don't understand how lib_uv works.
>
> Is anybody could help me ?
>
> Cheers
> Romain
>
> PS: for information the script is this one:
>
> require('async').forEachLimit(_.range(100000), 5, function(data, next){
>
> var request = require('request');
>
> var hosts = ['tpsmdu11s', 'tpsmdu12s', 'tpsmdu13s'];
> var host = _(hosts).shuffle()[0];
> var reqOpts = {
> url: 'http://' + host + ':9023/_search',
> method: 'post',
> timeout: options.timeout || 10000,
> body: '{ "a json document": { ... } }'
> };
> request(reqOpts, next);
> });
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