And this is the access log entry:
172.16.113.32 - - 172.16.228.63:8000 [03/Sep/2011:22:43:44 +0800] "GET
/file/0d97e01d7fbc48e498897492f0863929/260674/26fd3732cd9f92f2413d10206cd8b0c9-5157235
HTTP/1.0" 206 0 0.002 "-" "-" "-" Range:bytes=1059980- usTime:0.001
us:unix:/tmp/storage_fcgi_sock RID:0000052a-1109-0322-4344-842b2b0c0467
ERR:- ReqLength:171 ReqBody:- COOKIE:"-"
0000052a is connection id in hex.
2011/9/3 dr-dr xp <drdr.xp@gmail.com>
> The attachment is the error.log with only the failed request. And stat
> output of this file:
>
> stat
> //data2/0d97e01d7fbc48e498897492f0863929/g260674/257/26fd3732cd9f92f2413d10206cd8b0c9-5157235
> File:
> `//data2/0d97e01d7fbc48e498897492f0863929/g260674/257/26fd3732cd9f92f2413d10206cd8b0c9-5157235'
> Size: 51163499 Blocks: 100048 IO Block: 4096 regular file
> Device: 821h/2081d Inode: 464404482 Links: 1
> Access: (0664/-rw-rw-r--) Uid: ( 1003/ www) Gid: ( 1003/
> www)
> Access: 2011-09-03 22:31:22.000000000 +0800
> Modify: 2011-07-30 01:45:56.000000000 +0800
> Change: 2011-07-30 01:45:56.000000000 +0800
>
>
> Such error occurs randomly on random file. The only relavent thing seems
> like to be open_file_cache directive.
> File sizes are almost 5M to 20M.
> Files had not been changed. I checked the modify time of the files involved
> in these errors. At first I had thought it was caused by a file change too.
> But not.
>
> In my cluster there are also some other similar nodes running with the same
> open_file_cache parameters but without aio enabled(sendfile is used). They
> have no such issue.
>
>
>
>
> On Sat, Sep 3, 2011 at 6:03 PM, Maxim Dounin <mdounin@mdounin.ru> wrote:
>
>> Hello!
>>
>> On Sat, Sep 03, 2011 at 05:46:39PM +0800, dr-dr xp wrote:
>>
>> > Hello everybody. I recently have had some problem with AIO support and
>> need
>> > some help or advice on it.
>> >
>> > With AIO on, everything was OK. But when I enabled open_file_cache,
>> nginx
>> > frequently closed client connection directly without sending back any
>> data.
>> >
>> >
>> > My platform is linux 2.6.30. CentOS 5.4;
>> >
>> > The nginx server that has this issue serves static file at backend.
>> Another
>> > nginx serves as proxy in front of it.
>> > Backend nginx config is like this:
>> > ...
>> > aio on;
>> >
>> >
>> > directio 512;
>> >
>> >
>> > output_buffers 1 128k;
>> > ...
>> > location /files {
>> >
>> >
>> >
>> > internal;
>> >
>> >
>> > alias /;
>> > open_file_cache max=50000 inactive=20s;
>> >
>> >
>> > open_file_cache_valid 30s;
>> >
>> >
>> > open_file_cache_min_uses 1;
>> >
>> >
>> > open_file_cache_errors on;
>> >
>> >
>> > With this config, on the frontend proxy server there are error logs like
>> > this:
>> >
>> > 2011/09/03 17:01:19 [error] 12498#0: *78679759 *upstream prematurely
>> closed
>> > connection while reading response header from upstream*, client:
>> > 221.193.212.77, server: , request: "GET .......... HTTP/1.1", upstream:
>> > "http://
>> **/file/871586e763bf4417bf8d475858deee2b/260110/0b47fc7f4d84e4bcb01a6d6d1fcacc94-3581749",
>> > host.....
>> >
>> >
>> > And I saw in tcpdump output the connection was closed very quickly by
>> > backend nginx:
>> >
>> > 22:02:22.892327 IP 172.16.113.32.58271 > 172.16.228.63.irdmi: S
>> > 1788188296:1788188296(0) win 5840 <mss 1460,sackOK,timestamp 666482608
>> > 0,nop,wscale 7>
>> > 22:02:22.895683 IP 172.16.228.63.irdmi > 172.16.113.32.58271: S
>> > 350810413:350810413(0) ack 1788188297 win 5792 <mss
>> 1460,sackOK,timestamp
>> > 1948226601 66<
>> > 22:02:22.895695 IP 172.16.113.32.58271 > 172.16.228.63.irdmi: . ack 1
>> win 46
>> > <nop,nop,timestamp 666482612 1948226601>
>> > 22:02:22.895703 IP 172.16.113.32.58271 > 172.16.228.63.irdmi: P
>> 1:181(180)
>> > ack 1 win 46 <nop,nop,timestamp 666482612 1948226601>
>> > 22:02:22.897680 IP 172.16.228.63.irdmi > 172.16.113.32.58271: . ack 181
>> win
>> > 54 <nop,nop,timestamp 1948226603 666482612>
>> > 22:02:22.898348 IP 172.16.228.63.irdmi > 172.16.113.32.58271: F 1:1(0)
>> ack
>> > 181 win 54 <nop,nop,timestamp 1948226603 666482612>
>> > 22:02:22.898473 IP 172.16.113.32.58271 > 172.16.228.63.irdmi: F
>> 181:181(0)
>> > ack 2 win 46 <nop,nop,timestamp 666482615 1948226603>
>> > 22:02:22.899804 IP 172.16.228.63.irdmi > 172.16.113.32.58271: . ack 182
>> win
>> > 54 <nop,nop,timestamp 1948226605 666482615>
>> >
>> >
>> > On the backend nginx, strace shows that io_getevents got an error *"-22"
>> > EINVAL*.
>> >
>> > [pid 5275] recvfrom(48, 0x7fffe4400ae7, 1, 2, 0, 0) = -1 EAGAIN
>> (Resource
>> > temporarily unavailable)
>> > [pid 5275] epoll_wait(6, {{EPOLLIN|EPOLLOUT, {u32=2445415233,
>> > u64=139850875540289}}}, 512, 5672) = 1
>> > [pid 5275] recvfrom(201, "\1\6\0\1\0\337\1\0Status: 301 Moved
>> Perman"...,
>> > 4096, 0, NULL, NULL) = 256
>> > [pid 5275] close(201) = 0
>> > [pid 5275]
>> >
>> stat("//data1/871586e763bf4417bf8d475858deee2b/g268315/252/995f20f76d0d3871fdb5d71bbc92956c-27769564",
>> > {st_mode=S_IFREG|0600, st_size=122507, ...<
>> > [pid 5275] io_submit(139850942226432, 1, {{0xf43718, 0, 0, 0, 40}}) =
>> 1
>> >
>> >
>> > [pid 5275] epoll_wait(6, {{EPOLLIN, {u32=7173248, u64=7173248}}},
>> 512,
>> > 5671) = 1
>> >
>> > [pid 5275] read(7, "\1\0\0\0\0\0\0\0", 8) = 8
>> > [pid 5275] *io_getevents(139850942226432, 1, 64, {{0xf43718,
>> 0xf436d8,
>> > -22, 0}}, {0, 0}) = 1*
>> > [pid 5275] write(24, "172.16.164.30 - - 172.16.228.63:"..., 338) =
>> 338
>> > [pid 5275] close(48)
>> >
>> > And access.log shows that response length is ZERO:
>> >
>> > [03/Sep/2011:06:28:48 +0800] "GET
>> >
>> /file/871586e763bf4417bf8d475858deee2b/260284/ed31933859d27e33b8398deaea1d2ade-3969549
>> > HTTP/1.0" 206 0 0.001 "-" "-" "-" Range:bytes=27459105-
>> >
>> >
>> > After I removed those *open_file_cache* directives, No such error
>> occurred.
>> >
>> > And the shorter *inactive* is, the more often I get such errors.
>> >
>> >
>> > Anybody has idea about avoiding this or fixing it?
>>
>> Could you please provide debug log? See
>> http://wiki.nginx.org/Debugging for more information.
>>
>> Additionally, some more info about file requested might be
>> helpful: how big it is? whether it changed on backend during
>> requests? if yes, is it changed atomically?
>>
>> Maxim Dounin
>>
>> _______________________________________________
>> nginx mailing list
>> nginx@nginx.org
>> http://mailman.nginx.org/mailman/listinfo/nginx
>>
>
>
>
> --
> 要了几天饱饭就不记得西北风啥味了
>
--
要了几天饱饭就不记得西北风啥味了
_______________________________________________
nginx mailing list
nginx@nginx.org
http://mailman.nginx.org/mailman/listinfo/nginx
