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From Gary Tully <gary.tu...@gmail.com>
Subject Re: RE: Stuck Messages
Date Mon, 11 Feb 2013 13:17:54 GMT
fyi: the restart helps because the default brokerId is generated on start
so it is different each time.
the filter that prevent replay does it based on the broker path which
contains the brokerid.
if you explicitly set the broker identity (vi setBokerId) for each of your
networked brokers a restart won't help.
to have determinism it is advisable to set the broker identity when using
networks.


On 10 February 2013 12:39, SuoNayi <suonayi2006@163.com> wrote:

> Yes, the default configuration is very conservative.
> Because the default low limit for destinations,starters will always face
> the problem of hung producers or destinations(thread dump may reveal more).
> The quick solution they found is restarting the broker.
>
>
> When brokers are networked, messages may get stuck when they have
> forwarded to other brokers by demand while consumers on the curent
> broker suffer starving.Someone has provided some URL you need read.
>
>
>
> At 2013-02-10 03:06:45,"Raul Kripalani" <raul@evosent.com> wrote:
> >The people who installed your broker left the default configuration
> >untouched.
> >
> >I can't stress how important it is to tune AMQ in accordance with your
> >functional scenarios, messaging patterns, infrastructure and QoS
> >requirements. Otherwise, you're prone to experience issues like hung
> >producers, stuck queues, etc. because the default configuration is a
> >headache and not suitable for development nor production.
> >
> >For starters, producer flow control (PFC) is enabled with a very low limit
> >of 1mb.
> >
> >I suggest you read up around the AMQ site on PFC, system limits, slow
> >subscribers and cursors to get a better insight. Adjusting these is
> >straightforward and yield quick wins.
> >
> >Also, post a thread dump the next time, as someone else already said.
> >
> >Regards,
> >Raúl.
> >On 8 Feb 2013 16:58, "Donald Masanz" <don.masanz@carters.com> wrote:
> >
> >> I believe this is the file you are asking about.  I added a .txt
> extension
> >> so it would go thru our firewalls.
> >>
> >> From: Gaurav Sharma [via ActiveMQ] [mailto:
> >> ml-node+s2283324n4662994h57@n4.nabble.com]
> >> Sent: Thursday, February 07, 2013 11:13 AM
> >> To: Masanz, Don
> >> Subject: Re: Stuck Messages
> >>
> >> Aah, I see. So, a good place to start is:
> >> http://activemq.apache.org/performance-tuning.html
> >>
> >> AMQ is a non-trivial distributed system and infrastructure building
> block.
> >> So, like any such system, it needs to be tuned and configured for your
> >> needs and it is highly configurable and flexible.
> >> As you are reading the perf page, pull out your activemq.xml from the
> >> installed edi system - mask hosts/ports/passwds and post it on here.
> Your
> >> broker seems to be running low on system resources.
> >>
> >> On Feb 7, 2013, at 9:00, Donald Masanz <[hidden
> >> email]</user/SendEmail.jtp?type=node&node=4662994&i=0>> wrote:
> >>
> >> > Do you have any document available on MQ.  We had this installed in
> >> August of 2011, they installed MQ as part of our EDI software.  I am the
> >> ADMIN, but no one in our staff has actually ever done any set up or
> >> configurations.  It was all done for us.  Therefore when you mention all
> >> these options, I really don't have much of a clue what you are talking
> >> about.
> >> >
> >> >
> >> > From: Gaurav Sharma [via ActiveMQ] [mailto:[hidden
> >> email]</user/SendEmail.jtp?type=node&node=4662994&i=1>]
> >> > Sent: Thursday, February 07, 2013 10:57 AM
> >> > To: Masanz, Don
> >> > Subject: Re: Stuck Messages
> >> >
> >> > Forgot to mention - since you know what queues and topics have fast
> >> consumers that can keep up with producers, you can always setup nagios
> >> alerts (warn/critical) on 'Pending Messages'. I use my broker liveness
> >> monitor daemon that periodically performs synthetic transactions against
> >> the broker so I can auto-markdown bad apple broker nodes on the client
> side.
> >> >
> >> > On Feb 7, 2013, at 8:40, Gaurav Sharma <[hidden
> >> email]</user/SendEmail.jtp?type=node&node=4662992&i=0>> wrote:
> >> >
> >> >> Folks - when you notice the broker in a 'stuck' state, please take
a
> >> thread and heap dump before killing the broker process and share with
> devs
> >> on here.
> >> >>
> >> >> Also:
> >> >> 1. What broker topology are you using?
> >> >> 2. How many producers/consumers?
> >> >> 3. Are you pooling connections, producers, sessions?
> >> >> 4. How large are your messages?
> >> >> 5. How many concurrent connections? What is the rate of message flow
> >> /second?
> >> >> 6. Are messages persistent and if so, what store?
> >> >> 7. What are your system/memory usage settings? How much heap and RAM
> on
> >> brokers and on clients?
> >> >> 8. What is the prefetch size?
> >> >> 9. How are you using the broker - what role is it playing in your
> >> system? Using queues, topics, both?
> >> >> 10. Have you monitored GC activity on clients and brokers?
> >> >> 11. What amq transport are you using and via what client?
> >> >>
> >> >> There might be more than one factors at play here. Very curious how
> >> restarts are 'fixing' the problem.
> >> >>
> >> >> On Feb 7, 2013, at 8:18, Donald Masanz <[hidden
> >> email]</user/SendEmail.jtp?type=node&node=4662992&i=1>> wrote:
> >> >>
> >> >>> I took your advice this morning when I noticed that MQ had hung
up
> and
> >> was able to keep my application running while I restarted MQ.  Great
> tip.
> >>  Do you have a process that monitors MQ and notifies you if it stops
> >> processing, or do you have to do a manual check?
> >> >>>
> >> >>> From: tetoconsusport [via ActiveMQ] [mailto:[hidden
> >> email]</user/SendEmail.jtp?type=node&node=4662992&i=2>]
> >> >>> Sent: Wednesday, February 06, 2013 4:52 PM
> >> >>> To: Masanz, Don
> >> >>> Subject: Re: Stuck Messages
> >> >>>
> >> >>> Did you find a solution for this? We are running activemq 5.7 and
> have
> >> had this issue as well. If we restart activemq everything works
> however, we
> >> have not been able to find the root cause.
> >> >>> ________________________________
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> >> >
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>> --
> >> >>> View this message in context:
> >>
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> >> >
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> >> >
> >> >
> >> >
> >> >
> >> >
> >> > --
> >> > View this message in context:
> >>
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> >> > Sent from the ActiveMQ - User mailing list archive at Nabble.com.
> >>
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> >> >
> >>
> >>
> >> activemq.xml.txt (7K) <
> >>
> http://activemq.2283324.n4.nabble.com/attachment/4663068/0/activemq.xml.txt
> >> >
> >>
> >>
> >>
> >>
> >> --
> >> View this message in context:
> >>
> http://activemq.2283324.n4.nabble.com/Stuck-Messages-tp4662092p4663068.html
> >> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>



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