Re: Application Clustering
Re: Application Clustering
- Subject: Re: Application Clustering
- From: Arturo Pérez <email@hidden>
- Date: Mon, 10 Nov 2003 21:18:20 -0500
On Nov 10, 2003, at 8:50 PM, Karl wrote:
Thanks Jonathan.
For the notification mechanism, has anyone use JMS or Web Services for
this?
A very simple implementation is just to use a common DA url that one
application calls on others - but that requires you to know which
application instances are running. We were wondering whether there
was some undocumented functionality within wotaskd which allows us to
become aware of the status of running instances and then communicate
with them accordingly.
Two summers ago I wrote my own (under 4.5.1) using IP Multicast
technology.
I patterned it after the Distributed Notification Center that used to be
in the documentation. In fact, I tried using the DNC but found that it
wasn't intended to be used in a multi-host configuration.
It essentially followed your paradigm above. The multicast would be
used
to announce instances and then they would communicate via direct
actions.
If you're in an OSX-only (mostly?) environment you might want to look
into
the Rendezvous APIs. They almost certainly provide the glue that you
need
for the above. JMS would probably be massive overkill but that was my
plan,
two summers ago. Heck! I'd love to write it for you but copious free
time
being what it is (like NOT!)...
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