[jira] Updated: (TS-654) request for support of Layer7 http health checking for Origin Servers

["mohan_zl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

mohan_zl updated TS-654:
------------------------

    Attachment: Passive-L7-Health-Check.patch

Imitating the http state machine, we write a l7 health check module.
Trying our best not to change current codes, we create a directory named healthcheck in proxy/http, and implement the frame in this. 
Of course, we change or add some codes in exsiting files:
(1) In iocore/hostdb, we change files I_HostDBProcessor.h, P_HostDBProcessor.h, and HostDB.cc. We add some members in HostDBInfo, and add or change some functions in the three files for supporting health check
(2) In proxy/http, in order to implement a passive health check, we change the logic of function process_hostdb_info in HttpSM.cc
(3) Add info in relevant Makefile.am files

If you want to do health check for special origin server, you must write the relevant config information in healthcheck.config file, otherwise, traffic_server will not check health with that os. When you make install ts, the healthcheck.config file already exsits in the same place with records.config file, and some notes in this file tell you how to write config info for special origin server. 

When one client request is first coming and requesting info from the special origin server, http state machine will do dns resolve with the hostname of origin server and insert the result in hostdb, and immediately do health check with that origin server. Next time, because the hostname info is already in hostdb, the following client request will not cause immediate health check until the hostdb info is stale or bad in health, but periodically checking health with that os has been started.

> request for support of Layer7 http health checking for Origin Servers
> ---------------------------------------------------------------------
>
>                 Key: TS-654
>                 URL: https://issues.apache.org/jira/browse/TS-654
>             Project: Traffic Server
>          Issue Type: New Feature
>          Components: HTTP
>    Affects Versions: 2.1.5
>            Reporter: Zhao Yongming
>         Attachments: Passive-L7-Health-Check.patch
>
>
> this ticket is for the L7 health checking project: https://cwiki.apache.org/confluence/display/TS/HttpHealthCheck

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