Traffic Server 穿透问题
经过一段时间的使用，感觉ats还是很棒的，但是发现ats的穿透率比squid高了很多，使用squid的时候没有这个问题。被穿透元素的头信息如下
HTTP/1.1 200 OK
Server: ATS/3.2.0
Date: Thu, 08 Nov 2012 22:26:37 GMT
Content-Type: image/jpeg
Last-Modified: Mon, 18 Sep 2011 06:06:33 GMT
Expires: Thu, 31 Dec 2037 23:55:55 GMT
Cache-Control: max-age=315360000
Age: 335
Content-Length: 5952
Connection: keep-alive
Via: http/1.1(testcache)
ts的cache状态
% show:proxy-stats
Document Hit Rate -------- 92.711243 % *
Ram cache Hit Rate ------- 0.000000 % *
Bandwidth Saving --------- 81.534622 % *
Cache Percent Free ------- 0.003912 %
Open Server Connections -- 43
Open Client Connections -- 17
Open Cache Connections --- 7
Client Throughput -------- 70.436035 MBit/Sec
Transaction Per Second --- 802.877930
* Value represents 10 second average.
下面这个图是今天凌晨到中午11点穿透元素的排名情况
附我的records.config 配置文件 ，另外 其他配置文件没有对cache方面做任何的附加配置
3.2社区版本？ 社区版本里有个问题，不能存储body size=0的任何结果（其实这是RFC的要求），我们在TS-621上有相关的patch，或者参考我们公开的3.2代码：
https://gitorious.org/trafficserver/taobao/ branch 3.2
另一个是你的negative cache没有启用，如果你的这次穿透的请求里404 403啥的比较多的话，可以考虑启用这个：
#############################
# negative response caching #
#############################
CONFIG proxy.config.http.negative_caching_enabled INT 0
CONFIG proxy.config.http.negative_caching_lifetime INT 1800
再有就是多副本情况，建议你用http_ui看看cache中存储的这些内容，是不是多副本不够多造成的问题。可以考虑提高：
# The maximum number of alternates that are allowed for any given URL.
# It is not possible to strictly enforce this if the variable
# 'proxy.config.cache.vary_on_user_agent' is set to 1.
# The default value for 'proxy.config.cache.vary_on_user_agent' is 0.
# (0 disables the maximum number of alts check)
CONFIG proxy.config.cache.limits.http.max_alts INT 5
还有，如果你没有准确的expire时间的话，存储也可能成问题，建议看看调整：
# required headers: three options:
# 0 - No required headers to make document cachable
# 1 - "Last-Modified:", "Expires:", or "Cache-Control: max-age" required
# 2 - explicit lifetime required, "Expires:" or "Cache-Control: max-age"
CONFIG proxy.config.http.cache.required_headers INT 2
暂时想到这几个方向，从你贴出来的response看不懂为啥。用http_ui看看这些cache的内容，或许有些发现 aaaaaa 发表于 2012-11-09 15:45 static/image/common/back.gif
3.2社区版本？ 社区版本里有个问题，不能存储body size=0的任何结果（其实这是RFC的要求），我们在TS-621上 ...
非常感谢~ {:3_187:} 另一个是你的negative cache没有启用，如果你的这次穿透的请求里404 403啥的比较多的话，可以考虑启用这个：
#############################
# negative response caching #
#############################
CONFIG proxy.config.http.negative_caching_enabled INT 0
CONFIG proxy.config.http.negative_caching_lifetime INT 1800 aaaaaa
穿透的元素都是200，文件都存在。
再有就是多副本情况，建议你用http_ui看看cache中存储的这些内容，是不是多副本不够多造成的问题。可以考虑提高：
# The maximum number of alternates that are allowed for any given URL.
# It is not possible to strictly enforce this if the variable
# 'proxy.config.cache.vary_on_user_agent' is set to 1.
# The default value for 'proxy.config.cache.vary_on_user_agent' is 0.
# (0 disables the maximum number of alts check)
CONFIG proxy.config.cache.limits.http.max_alts INT 5
我把 proxy.config.cache.limits.http.max_alts 设为 20后穿透少了很多，但是还是有一小部分的穿透，难道20还不够大么
有点不理解ats的多副本，按照我的理解如果是元素是可以压缩的，存两份就可以了：一份不压缩，一份压缩
多副本有什么意思呢
还有，如果你没有准确的expire时间的话，存储也可能成问题，建议看看调整：
# required headers: three options:
# 0 - No required headers to make document cachable
# 1 - "Last-Modified:", "Expires:", or "Cache-Control: max-age" required
# 2 - explicit lifetime required, "Expires:" or "Cache-Control: max-age"
CONFIG proxy.config.http.cache.required_headers INT 2
元素都是有明确过期时间的
20个副本都不够的情况也可能是存在的。TS在作副本match的时候，存在一个不是最match的可能，结果会一直往cache系统里写入。我建议你用http_ui把相关的副本dump出来，这个会是一个非常好的可以用来改进TS的match代码的例子，一定要搞出来这个：
http://people.apache.org/~zym/trafficserver/FAQ.html 有关于http_ui的说明 回复 5# aaaaaa
抓了一个url的信息，您给看看 有没有问题http://test.aaaa.com/c/html/css/aaa-nav.css?2012-11-12
Doc
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Server: nginx/0.6.35
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Server: nginx/0.6.35
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Content-Encoding: gzip 本帖最后由 LnBSD 于 2012-11-12 14:26 编辑
接楼上
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Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 05:49:23 GMT
Content-Type: text/css
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 05:49:23 GMT
Cache-Control: max-age=315360000
Content-Encoding: gzip
Size 7605
Key 797EF863D9FC9FFE1334515F9F6EF454
Request sent time Mon Nov 12 13:49:23 2012
Response received time Mon Nov 12 13:49:23 2012
Alternate 13
Request Header GET http://10.15.233.199/c/html/css/aaa-nav.css?2012-11-12 HTTP/1.1
X-Real-IP: 10.15.232.10
X-Forwarded-For: 10.15.232.10, 127.0.0.1
Host: test.aaaa.com
Accept: text/css
Referer: http://c.aaa.net/forum_1_15.html
Accept-Language: zh-CN
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)
Accept-Encoding: gzip, deflate, peerdist
DNT: 1
X-P2P-PeerDist: Version=1.1
X-P2P-PeerDistEx: MinContentInformation=1.0, MaxContentInformation=2.0
X-aaa-Forwarded-For: 101.84.61.69
Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 05:50:19 GMT
Content-Type: text/css
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 05:50:19 GMT
Cache-Control: max-age=315360000
Content-Encoding: gzip
Size 7605
Key D5E7ACC2EC7C27DC93A77298AAE97908
Request sent time Mon Nov 12 13:50:19 2012
Response received time Mon Nov 12 13:50:20 2012
Alternate 14
Request Header GET http://10.15.233.199/c/html/css/aaa-nav.css?2012-11-12 HTTP/1.1
X-Real-IP: 10.15.232.10
X-Forwarded-For: 10.15.232.10, 127.0.0.1
Host: test.aaaa.com
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11
Accept: text/css,*/*;q=0.1
Referer: http://c.aaa.net/thread_1_15_4280275_1__.html
Accept-Encoding: gzip,default,sdch
Accept-Language: zh-CN,zh;q=0.8
Accept-Charset: GBK,utf-8;q=0.7,*;q=0.3
X-aaa-Forwarded-For: 122.225.36.204
Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 05:56:08 GMT
Content-Type: text/css
Content-Length: 36685
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 05:56:08 GMT
Cache-Control: max-age=315360000
Accept-Ranges: bytes
Size 36685
Key 08EAF585F333ACF97988D9D93DF69D72
Request sent time Mon Nov 12 13:55:26 2012
Response received time Mon Nov 12 13:56:08 2012
Alternate 15
Request Header GET http://10.15.233.199/c/html/css/aaa-nav.css?2012-11-12 HTTP/1.1
X-Real-IP: 10.15.232.10
X-Forwarded-For: 10.15.232.10, 127.0.0.1
Host: test.aaaa.com
Accept: */*
Referer: http://c.aaa.net/thread_1_15_7313070__.html
Accept-Language: zh-cn
UA-CPU: x86
Accept-Encoding: identity
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)
Cache-Control: max-age=259200
X-aaa-Forwarded-For: 101.95.5.90
Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 05:56:28 GMT
Content-Type: text/css
Content-Length: 36685
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 05:56:28 GMT
Cache-Control: max-age=315360000
Accept-Ranges: bytes
Size 36685
Key 54787B09EE258503F2D441989C7BE36D
Request sent time Mon Nov 12 13:56:08 2012
Response received time Mon Nov 12 13:56:28 2012
Alternate 16
Request Header GET http://10.15.233.199/c/html/css/aaa-nav.css?2012-11-12 HTTP/1.1
X-Real-IP: 10.15.232.10
X-Forwarded-For: 10.15.232.10, 127.0.0.1
Host: test.aaaa.com
Accept: text/css
Referer: http://aaaa.com/thread_10_15_4106141___.html
Accept-Language: zh-CN
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Accept-Encoding: none
X-Original-To: 222.73.174.163
X-aaa-Forwarded-For: 202.104.231.143
Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 06:06:28 GMT
Content-Type: text/css
Content-Length: 36685
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 06:06:28 GMT
Cache-Control: max-age=315360000
Accept-Ranges: bytes
Size 36685
Key CA98CF7FCB6D7130A77F991E22466F2D
Request sent time Mon Nov 12 14:06:28 2012
Response received time Mon Nov 12 14:06:29 2012
Alternate 17
Request Header GET http://10.15.233.199/c/html/css/aaa-nav.css?2012-11-12 HTTP/1.1
X-Real-IP: 10.15.232.10
X-Forwarded-For: 10.15.232.10, 127.0.0.1
Host: test.aaaa.com
Referer: http://c.aaa.net/thread_1_15_6881635.html
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
Accept: text/css
Accept-Language: zh-CN
X-aaa-Forwarded-For: 211.100.224.72
Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 06:06:29 GMT
Content-Type: text/css
Content-Length: 36685
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 06:06:29 GMT
Cache-Control: max-age=315360000
Accept-Ranges: bytes
Size 36685
Key 9129484097BA418D9D8B6C43FEA0ECDD
Request sent time Mon Nov 12 14:06:29 2012
Response received time Mon Nov 12 14:06:30 2012
Alternate 18
Request Header GET http://10.15.233.199/c/html/css/aaa-nav.css?2012-11-12 HTTP/1.1
X-Real-IP: 10.15.232.10
X-Forwarded-For: 10.15.232.10, 127.0.0.1
Host: test.aaaa.com
User-Agent: Mozilla/4.0 (compatible; Lotus-Notes/6.0; Windows-NT)
Accept-Language: zh-CN
Accept-Language: zh-CN
Accept: text/html
Accept: text/x-html
Accept: application/html
Accept: application/x-html
Accept: text/plain
Accept: image/gif
Accept: image/jpeg
Accept: multipart/*
Accept: application/x-x509-user-cert
Accept: application/x-x509-ca-cert
Accept: */*
Cache-Control: max-stale=0, no-cache
Pragma: no-cache
X-BlueCoat-Via: 083a1f168d54b40b
X-aaa-Forwarded-For: 159.245.48.2
Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 06:09:47 GMT
Content-Type: text/css
Content-Length: 36685
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 06:09:47 GMT
Cache-Control: max-age=315360000
Accept-Ranges: bytes
Size 36685
Key A649484676ADBDA1B9CC89B36E7897B7
Request sent time Mon Nov 12 14:09:46 2012
Response received time Mon Nov 12 14:09:47 2012
Alternate 19
Request Header GET http://10.15.233.199/c/html/css/aaa-nav.css?2012-11-12 HTTP/1.1
X-Real-IP: 10.15.232.10
X-Forwarded-For: 10.15.232.10, 127.0.0.1
Host: test.aaaa.com
Cache-Control: max-age=0
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11 AirView1.0
Accept: text/css,*/*;q=0.1
Referer: http://c.aaa.net/thread_1_15_7313355_1.html
Accept-Encoding: gzip,deflate,sdch
Accept-Language: zh-CN,zh;q=0.8
Accept-Charset: GBK,utf-8;q=0.7,*;q=0.3
Cookie: __userId=546610785; sessionID=ea6722a3c7ee77a8b77a2cbe172d9aae; __P_NickName=%B7%EF%BB%CB%CD%E8; __P_JS_NickName=%25u51e4%25u51f0%25u4e38; __P_UserName=sonicphoenix; __P_UserId=546610785; __P_AuthCode=77e11188e9ce8516ae78425d3396d00a; _xauthTK=%7B%22uid%22%3A%22546610785%22%2C%22uname%22%3A%22sonicphoenix%22%2C%22time%22%3A1352686259%7D; _xauthSG=879a0ff028cb8931a523f7d18f2315d8; aaaTrackId=75513142; aaaTrackFirstTime=1352686332887; aaaTrackReturnTime=1352686332887; ip_ck=58SC7/r/j7QuMDMzODA4LjEzNTI2ODYzMjM%3D; lv=1352686333; vn=1; plus_secret=0ae3466f916c7d97ede6fe6b07a9e9d2
X-aaa-Forwarded-For: 180.173.8.63
Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 06:09:47 GMT
Content-Type: text/css
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 06:09:47 GMT
Cache-Control: max-age=315360000
Content-Encoding: gzip
Size 7605
Key 91C653CD647FFBCC12735CE25ACFE182
Request sent time Mon Nov 12 14:09:47 2012
Response received time Mon Nov 12 14:09:48 2012
Alternate 20
Request Header GET http://10.15.233.199/c/html/css/aaa-nav.css?2012-11-12 HTTP/1.1
X-Real-IP: 10.15.232.10
X-Forwarded-For: 10.15.232.10, 127.0.0.1
Host: test.aaaa.com
Referer: http://c.aaa.net/forum_1_15.html
Accept-Encoding: gzip
Accept-Language: zh-CN
User-Agent: Mozilla/5.0 (Linux; U; Android 2.3.3; zh-cn; HTC Incredible S Build/GRI40) UC AppleWebKit/534.31 (KHTML, like Gecko) Mobile Safari/534.31
Cookie: aaaTrackId=65177241; ip_ck=7sGE5v7yj7QuOTY1MTQ1LjEzMjUyOTY4MjM%3D; __gads=ID=379bc7db5914281f:T=1326377611:S=ALNI_MZ3ki1MfKutArlp0DpZGI_LFkc9Xw; Hm_lvt_07d927b19bdaf5589e55729845538e23=1329553052921; __utma=250699996.2095397326.1323129782.1328622160.1329553053.21; aaaTrackFirstTime=1350886992270; aaaTrackReturnCnt=39; aaaTrackReturnTime=1352379677326; lv=1352379677; vn=31
Accept: text/css,*/*;q=0.1
X-aaa-Forwarded-For: 114.90.15.117
Client-ip: 127.0.0.1
Response Header HTTP/1.1 200 OK
Server: nginx/0.6.35
Date: Mon, 12 Nov 2012 06:10:04 GMT
Content-Type: text/css
Last-Modified: Thu, 17 May 2012 01:32:16 GMT
Connection: keep-alive
Vary: Accept-Encoding
Expires: Thu, 10 Nov 2022 06:10:04 GMT
Cache-Control: max-age=315360000
Content-Encoding: gzip
Size 7605
Key 2A9B8A5083DC3FABF301F39E3736B199
Request sent time Mon Nov 12 14:10:03 2012
Response received time Mon Nov 12 14:10:04 2012
本帖最后由 LnBSD 于 2012-11-13 09:48 编辑
我觉得问题可能在客户端的 header
Accept-Encoding:
这个太多值了，造成大量的副本存储 grep"^Accept-Encoding" x|sort -n|uniq
Accept-Encoding:
Accept-Encoding: deflate, gzip
Accept-Encoding: deflate, gzip, identity
Accept-Encoding: deflate, gzip, x-gzip, identity, *;q=0
Accept-Encoding: gzip
Accept-Encoding: gzip, deflate
Accept-Encoding: gzip,deflate,bzip2,sdch
Accept-Encoding: gzip, deflate, compress
Accept-Encoding: gzip,deflate,gzip
Accept-Encoding: gzip, deflate, identity
Accept-Encoding: gzip, deflate, peerdist
Accept-Encoding: gzip,deflate,sdch
Accept-Encoding: gzip;q=1.0,identity;q=0.8,qzip;q=0.5
Accept-Encoding: identity
Accept-Encoding: none
Accept-Encoding: xxxx, xxxxxxx
Accept-Encoding: xzip, default
Accept-Encoding: xzip,default,sdch
# grep"^Accept-Encoding" x|sort -n|uniq |wc -l
18类似squid的这个问题 http://windtear.net/2008/07/squid_patch_accept-encoding_multi_cache.html
把 proxy.config.http.normalize_ae_gzip 设为1 就可以解决 Accept-Encoding 无规律头信息的问题了
如果 ats 内置的 Accept-Encoding: gzip 能自定义就更好了，毕竟 标准ie的用户要
多一些
回复 5# aaaaaa
做了proxy.config.http.normalize_ae_gzip 设为1 调整以后，穿透明显减少，效果很不错
TS的多副本match是让我吐血的一点之一。这个地方需要动些手脚。
proxy.config.http.normalize_ae_gzip有效果也还可以啊。再看看后面其他穿透的还有问题吗
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