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From Martin Knoblauch <knobis...@gmail.com>
Subject Re: mod_jk worker activation not working anymore in 1.2.37?
Date Mon, 10 Jun 2013 22:58:24 GMT
Any plans when 1.2.38 will be released?

Thanks
Martin


On Mon, Jun 10, 2013 at 10:20 PM, Rainer Jung <rainer.jung@kippdata.de>wrote:

> On 10.06.2013 17:29, Konstantin Kolinko wrote:
> > 2013/6/10 David Gubler <dg@doodle.com>:
> >> Hi list,
> >>
> >> We have recently upgraded our Apache servers from Debian Squeeze to
> Wheezy
> >> (from Apache 2.2.16 with mod_jk 1.2.30 to Apache 2.2.22 with mod_jk
> 1.2.37).
> >> The Tomcat version hasn't changed (7.0.37).
> >>
> >> We often do rolling releases by disabling (DIS) some worker in
> jkmanager,
> >> waiting for a few minutes for most sessions to go away (we use sticky
> >> sessions but not forced), upgrading it, and re-enabling it. This worked
> >> perfectly with mod_jk 1.2.30. The server is rather busy (order of
> 100-200
> >> req/s going to tomcat).
> >>
> >> However, with mod_jk 1.2.37, the activation state behaves erratically.
> Say I
> >> disable worker1 on all apache servers via jkmanager. When I go back to
> the
> >> jkmanager overview screen, it still shows as active. I hit reload, now
> it
> >> shows as disabled. I can wait for a few seconds or minutes, reload, and
> >> suddenly it shows up as active again! It keeps switching back and forth
> >> between active and disabled if I reload often enough. Afterwards I
> usually
> >> have to set it to active a few times to make it stick there. This
> happens on
> >> all apache servers independently.
> >>
> >> And more worringly, the load on the worker does not decrease, not even
> after
> >> waiting for half an hour or longer (with 1.2.30, the load on a worker
> >> decreased to about 5% after 5-10 minutes).
> >>
> >> When I set a worker to stopped, the activation state also switches
> between
> >> active and stopped, the load on the worker goes down slowly, but the
> >> requests do not cease completely. With 1.2.30, I could set a worker to
> >> stopped and it instantaneously received no more requests.
> >>
> >> Other than that, mod_jk behaves as expected (e.g. if I shut down one of
> the
> >> tomcats, the requests go to the other; load balancing works fine in
> normal
> >> operation).
> >>
> >> I have stripped down our workers.properties to the bare minimum that we
> >> need, and the problem is still there:
> >>
> >> ps=/
> >> worker.list=loadbalancer,jkstatus
> >> worker.jkstatus.type=status
> >>
> >> worker.loadbalancer.type=lb
> >> worker.loadbalancer.sticky_session=true
> >> worker.loadbalancer.balance_workers=worker1,worker2
> >>
> >> worker.worker1.type=ajp13
> >> worker.worker1.host=WW.XX.YY.ZZ
> >> worker.worker1.port=8009
> >> worker.worker1.connect_timeout=70000
> >> worker.worker1.prepost_timeout=70000
> >> worker.worker1.socket_timeout=70
> >> worker.worker1.connection_pool_timeout=70
> >> worker.worker1.connection_pool_size=200
> >> worker.worker1.retry_interval=1000
> >> worker.worker1.lbfactor=1
> >>
> >> [same for worker2, only difference is the IP address]
> >>
> >> Rest of the configuration is Debian standard. Apache uses JkAutoAlias,
> >> JkMount and a bunch of JkUnMounts, but nothing fancy.
> >>
> >> The changelog does not really give me any clues as to what change could
> >> cause this, and neither does the workers.properties documentation :(
> >>
> >> Does anyone have an idea what I could be doing wrong?
> >>
> >
> > Looking at the current changelog,
> > <section name="Changes between 1.2.37 and 1.2.38">
> > ...
> >      <fix>
> >         Fix status worker not updating parameters for all members.
> (mturk)
> >       </fix>
> >
> > That is
> > http://svn.apache.org/viewvc?view=revision&revision=1354021
>
> Yes that should be it.
>
> If the OP compiles himself, just add the tiny patch
>
>
> http://svn.apache.org/viewvc/tomcat/jk/trunk/native/common/jk_status.c?r1=1354021&r2=1354020&pathrev=1354021
>
> to your mod_jk source before compiling.
>
> Regards,
>
> Rainer
>
>
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>


-- 
------------------------------------------------------
Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www: http://www.knobisoft.de

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