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Issue using ngx.location.capture in Lua Module

Legrand Jérémie
January 06, 2012 06:02AM
Hi,

I have a very strange issue with a lua script I use in an access_by_lua_file directive.

In this script, I make two subrequests with ngx.location.capture :

local authRequest = ngx.location.capture("/memc", { args = { key = ngx.var.key } })
local authDatabaseRequest = ngx.location.capture("/postgres", { args = { key = ngx.var.key } })

The first subrequest goes to location memc defined as follow :

location ~ ^/memc {
default_type text/plain;
set $memc_cmd get;
set $memc_key $arg_key;
memc_pass memcache;

#ACL
internal;
}

It refers to the upstream memcache defined like this :

upstream memcache {
server 127.0.0.1:11211 max_fails=3 fail_timeout=10s;
}

The second request goes to location postgres :

location /postgres {
set $key $arg_key;
postgres_pass database;
postgres_query "SELECT name
FROM key k
WHERE mykey = '$key'";
postgres_output value 0 0;
}

It refers to an upstream database which makes a distant connection to my postgres database :

upstream database {
postgres_server my_postgres_adress:5433 dbname=mydbname user=myuser password=mypass;
}

When I start the nginx server and request something, the lua script does correctly the memcache subrequest but I get this message for the postgres subrequest :

[error] 24631#0: *28 postgres: connection failed: could not send startup packet: Resource temporarily unavailable

If I change the order of subrequests in my script, doing first the postgres subrequest and after the memcache subrequest, there is no error and both subrequests are done successfully.
It seems that the memcached subrequest does not release correctly the connection.

For performance constraints I need to make the memcache request first.

Thanks for help if someone have an idea to resolve this issue.

Jeremie Legrand

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Subject Author Views Posted

Issue using ngx.location.capture in Lua Module

Legrand Jérémie 2429 January 06, 2012 06:02AM

Re: Issue using ngx.location.capture in Lua Module

agentzh 734 January 07, 2012 06:26AM

Re: Issue using ngx.location.capture in Lua Module

Piotr Sikora 636 January 09, 2012 10:00AM

RE: Issue using ngx.location.capture in Lua Module

Legrand Jérémie 802 January 10, 2012 10:24AM



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