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Trace Nodes in MultiThread Environment

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amitkothari18

Posted: Wed Aug 10, 2011 2:10 pm Post subject: Trace Nodes in MultiThread Environment

Novice

Joined: 12 Feb 2011
Posts: 24

Hi,

I need some help to understand the behavior of Trace nodes in a multi threaded broker environment. Will that be a problem if two instances of a msgflow try to write to same trace file, how is that handled by WMB?

Also, will the same behavior apply to multiple brokers running same flows with Trace nodes writing to same location and same files?

All the help is really appreciated!!

WMBv6.1.0.8

Thanks

Vitor

Posted: Thu Aug 11, 2011 4:02 am Post subject:

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

Trace nodes are intended as diagnostic aids and therefore don't typically run in mutli-threaded, high throughput environments. They're a cumbersome and resource hungry means of logging messages.

If you're writing to an external file, 2 instances writing to the same file will be handled by the OS not by WMB and whatever file-collision mechanism the OS has (if any) will come into play. Typically one instance will get an I/O error and crash. If they're writing to the broker log, then the trace information won't collide but will be intervieved.

Likewise multiple brokers have their own internal logs so the Trace output will go there if logged internally. If they're using external files then my comments above apply.

I can't think of a good reason to use Trace nodes like this. The only reason I can think of is the one I gave up top (message logging) and that's not a good reason. What are you attempting to achieve here?
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