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References: 
Date: Tue, 24 May 2011 07:13:28 -0700 (PDT)
From: Keith Mashinter <kmashint@yahoo.com>
Reply-To: Keith Mashinter <kmashint@yahoo.com>
To: "users@httpd.apache.org" <users@httpd.apache.org>
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Subject: [users@httpd] ENH 51247 - Enhance mod_proxy and _balancer with worker
 status flag to only accept sticky session routes 

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=0A=0AI've added a patch to the proxy/balancer to allow for route-only work=
ers are only enabled for sticky session routes, allowing for an even more =
=0Agraceful fade-out of a server than making its lbfactor=3D1 compared to =
=0Albfactor=3D100 for others.=A0 =0A=0A=0APlease vote for it in bugzilla if=
 you also think it's useful.=0A=0A=0Ahttps://issues.apache.org/bugzilla/sho=
w_bug.cgi?id=3D51247=0AThis enhancement, actually SVN Patched against 2.2.1=
9, provides a worker status=0Aflag to set a proxy worker as only accepting =
requests with sticky session=0Aroutes, e.g. only accept requests with a .ro=
ute such as Cookie=0AJSESSIONID=3Dxxx.tc2.=0A=0AThis allows for a graceful =
fade-out of servers when their sessions are removed;=0Athey continue to rec=
eive requests for their sticky session routes but are=0Apassed over for req=
uests with no specified route, just as if they were=0Adisabled.  In other w=
ords, route-only workers are only enabled for sticky=0Asession routes.=0A=
=0AIntended use (Tomcat JSESSIONID noted here but could be PHPSESSIONID, Ru=
by=0A_session_id, or anything with cookie or request-parameter based sessio=
n ids):=0A1. An Apache rev-proxy running for multiple Tomcats.=0A2. To fade=
-out a Tomcat for maintenance, set route-only enabled in=0Athe=0Abalancer-m=
anager or reload the configuration with the worker status +R.=0A(This depen=
ds on Tomcat web-apps delete session cookies, see further below.)=0A3. Chec=
k on the balancer-manager or its Tomcat worker even a few minutes /=0Ahours=
, and when it seems to have completed old sessions you can mark it fully=0A=
disabled.=0A4. Once done maintenance, you can then set route-only disabled =
(status -R) and=0Afully enable the worker again.=0A=0ATo delete a JSESSIONI=
D Cookie from a Servlet, you need to specify the same=0ADomain and Path as =
the original Cookie and setMaxAge=3D0 as in the typical=0Aexample below but=
 you should check on your own Domain and Path when a Cookie is=0Acreated, e=
.g. watch the Cookie headers in Firefox Firebug.=0A=0A// To delete a Cookie=
 setMaxAge(0) and also any original domain and path if=0Aspecified.=0ACooki=
e ck =3D new Cookie("JSESSIONID", null);=0A//ck.setDomain("");=0Ack.setPath=
(request.getContextPath());=0Ack.setMaxAge(0);=0Aresponse.addCookie(ck);=0A=
=A0=0A\|/- Keith Mashinter =0Akmashint@yahoo.com
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:Co=
urier New, courier, monaco, monospace, sans-serif;font-size:10pt"><div id=
=3D"yiv961200012"><div style=3D"color: rgb(0, 0, 0); background-color: rgb(=
255, 255, 255); font-family: Courier New,courier,monaco,monospace,sans-seri=
f; font-size: 10pt;"><div id=3D"yiv961200012yui_3_2_0_2_130624355956345"><s=
pan></span><br><div style=3D"font-family: arial,helvetica,sans-serif;"><fon=
t size=3D"2">I've=0A added a patch to the proxy/balancer to allow for route=
-only workers are=0A only enabled for sticky session routes, allowing for a=
n even more =0Agraceful fade-out of a server than making its lbfactor=3D1 c=
ompared to =0Albfactor=3D100 for others.&nbsp; <br></font></div><div style=
=3D"font-family: arial,helvetica,sans-serif;"><font size=3D"2"><br></font><=
/div><div style=3D"font-family: arial,helvetica,sans-serif;"><font size=3D"=
2">Please vote for it in bugzilla if you also think it's useful.<br></font>=
</div><div style=3D"font-family: arial,helvetica,sans-serif;"><font size=3D=
"2"><br><span></span></font></div><div style=3D"font-family: arial,helvetic=
a,sans-serif;"><font size=3D"2"><span>https://issues.apache.org/bugzilla/sh=
ow_bug.cgi?id=3D51247</span></font></div><pre class=3D"yiv832472280bz_comme=
nt_text" id=3D"yiv832472280comment_text_0"><font style=3D"font-family: aria=
l,helvetica,sans-serif;" size=3D"2">This enhancement, actually SVN Patched =
against 2.2.19, provides a worker status<br>flag to set a proxy worker as o=
nly accepting requests with sticky session<br>routes, e.g. only accept requ=
ests with a .route such as Cookie<br>JSESSIONID=3Dxxx.tc2.<br><br>This allo=
ws for a graceful fade-out of servers
 when their sessions are removed;<br>they continue to receive requests for =
their sticky session routes but are<br>passed over for requests with no spe=
cified route, just as if they were<br>disabled.  In other words, route-only=
 workers are only enabled for sticky<br>session routes.<br><br>Intended use=
 (Tomcat JSESSIONID noted here but could be PHPSESSIONID, Ruby<br>_session_=
id, or anything with cookie or request-parameter based session ids):<br>1. =
An Apache rev-proxy running for multiple Tomcats.<br>2. To fade-out a Tomca=
t for maintenance, set route-only enabled in<br> the<br>balancer-manager or=
 reload the configuration with the worker status +R.<br>(This depends on To=
mcat web-apps delete session cookies, see further below.)<br>3. Check on th=
e balancer-manager or its Tomcat worker even a few minutes /<br>hours, and =
when it seems to have completed old sessions you can mark it fully<br>disab=
led.<br>4. Once done maintenance, you can then set route-only
 disabled (status -R) and<br>fully enable the worker again.<br><br>To delet=
e a JSESSIONID Cookie from a Servlet, you need to specify the same<br>Domai=
n and Path as the original Cookie and setMaxAge=3D0 as in the typical<br>ex=
ample below but you should check on your own Domain and Path when a Cookie =
is<br>created, e.g. watch the Cookie headers in Firefox Firebug.<br></font>=
<br><font style=3D"font-family: Courier New,courier,monaco,monospace,sans-s=
erif;" size=3D"2">    // To delete a Cookie setMaxAge(0) and also any origi=
nal domain and path if<br>specified.<br>    Cookie ck =3D new Cookie("JSESS=
IONID", null);<br>    //ck.setDomain("");<br>    ck.setPath(request.getCont=
extPath());<br>    ck.setMaxAge(0);<br>    response.addCookie(ck);</font></=
pre></div><div id=3D"yiv961200012yui_3_2_0_2_130624355956348">&nbsp;<span><=
/span></div><div>\|/- Keith Mashinter      <br id=3D"yiv961200012yui_3_2_0_=
2_130624355956353"> kmashint@yahoo.com</div></div></div></div></body></html=
>
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