December 2006 - jboss-dev-forums - Jboss List Archives

[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by estebanschifman

There's the old hearbeat trick. Processes could be required to send a periodic heartbeat that would change the 'time to live' for that particular registry entry. A garbage cleaner could purge stale entries View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991350#3991350 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991350

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by daniel.brum＠jboss.com

That sounds good and acceptable to me, so long as we provide the mechanism for someone to do that administration. How should they go about detecting dead EPRs in the database? Why not build an admin console (or something like that) where you could see all registered EPR's and even try sending an 'ack' message to each - no response or no confirmation that it's up and you could punt it. by confirmation, it could be a simple telnet to the epr port, etc... just an idea. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991348#3991348 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991348

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by mark.little＠jboss.com

Without getting into too much technical detail, but it's never possible to detect a failure with 100% accuracy until the failure is fixed. All you can ever do is failure suspect. With this approach to UIDs and multiple registration, we're always going to have garbage in the registry in the event of failures and it's never going to be possible for us to know for certain that we can/should remove an EPR. This is a long winded way of saying: we can punt this to a sys admin function for now. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991339#3991339 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991339

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by kurt.stam＠jboss.com

Note that like the registry, the admin will never know if the EPR is dead, unless the all the ESB systems are down. Which is a situation that will not likely occur. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991338#3991338 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991338

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by mark.little＠jboss.com

"kurt.stam(a)jboss.com" wrote : | yes right now upon unregistering I clean out all similarly looking EPRs. | How do you define "simiarly looking"? You shouldn't be comparing EPRs because equality isn't supported. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991337#3991337 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991337

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by tfennelly

"kurt.stam(a)jboss.com" wrote : Yes, but right now they get cleaned out now when unregistering a similarly looking EPR. But we know where that's getting us ;-) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991336#3991336 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991336

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by kurt.stam＠jboss.com

Yes, but right now they get cleaned out now when unregistering a similarly looking EPR. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991335#3991335 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991335

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by mark.little＠jboss.com

"tfennelly" wrote : "kurt.stam(a)jboss.com" wrote : anonymous wrote : I'm still worried that we end up with 'dead' EPRs, but I guess the code that consumes EPRs can pick the next one (and unregister dead onces?). | | | | Can't that happen in either case? | | Yes, unless we tell users to persist the UID they get back. | | A complete and correct solution is more complex than we have time for. I suggest that we simply don't clear out all of the EPRs at un-registration time. Any "dead" EPRs can be handled by a sys admin. Plus, the definition of a "dead" EPR may well be implementation specific. | | If we agree and this works (!) then we need to call this out in the docs. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991334#3991334 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991334

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by tfennelly

"kurt.stam(a)jboss.com" wrote : anonymous wrote : I'm still worried that we end up with 'dead' EPRs, but I guess the code that consumes EPRs can pick the next one (and unregister dead onces?). | | Can't that happen in either case? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991333#3991333 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991333

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[Design of JBoss ESB] - Re: Multithreaded services and their EPR(s)

by kurt.stam＠jboss.com

anonymous wrote : If it does support registering the same EPR 1+ times, then... if you didn't change the interface at all and just removed/unregistered 1 of the EPR instances matching the name, would that solve the issue? What are we doing at the moment - removing them all? yes right now upon unregistering I clean out all similarly looking EPRs. I'm still worried that we end up with 'dead' EPRs, but I guess the code that consumes EPRs can pick the next one (and unregister dead onces?). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991332#3991332 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991332

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jboss-dev-forums December 2006