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Jerome

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Reply with quote  #16 
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Originally Posted by kgati

Another issue I've been experiencing is with the Metastorm Process Engine on version 9.1. We are running Metastorm on Windows Server 2008 SR2 and the Metastorm Process Engine stops randomly, affecting the processes on that server. Is this a common issue? If so how can I troubleshoot this?

Thank you.


Please start a new thread for each issue. It makes it easier to follow and for future users to find.

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royster

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Reply with quote  #17 
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There is another post of mine here about the issue. It seems to have been to do with a  rounding error, and the loopback continues until the end of that second. I have posted this on Metatsorm's community as well, along with a test solution (IIRC).

I have no idea if it is fixed or when, however, as I rarely have the time to go through everything for every release.


Certainly this is not fixed in 9.2.
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Jerome

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Reply with quote  #18 
That is pretty sad. I diagnosed and solved the riddle months ago. Have you reported it?
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BMellert

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Reply with quote  #19 
When I raised the loop back timer issue with OpenText a few months ago, I was told to guarantee that the clocks on the database and engine servers are always perfectly in sync.  I don't understand why the use one clock for part of time loop back processing and another clock for other parts, causing loops to happen.

While the times are resynced regularly, slight delays can happen.  To get around this I used the approach Jerome suggested in another chain to add a check variable to prevent duplicate loop-back emails.
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Jerome

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Reply with quote  #20 
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Originally Posted by BMellert
I don't understand why the use one clock for part of time loop back processing and another clock for other parts, causing loops to happen.


Poor design, to be blunt. I think the issue arose because any engine can be set to perform timed (or all system) events. Because of the fact that different engine servers may have different times, the database time is presumably used.

Unfortunately, that causes a potential conflict between the engine and database server clocks, so the problem is merely moved to a different place. I say you have to have one clock and keep to it, not force a sync between different servers. I have never seen that restriction before. We even have engine and database servers in different states (and different time zones) at one customer site!

Presumin' Ed may clarify if he passes by, or then again, he may flame me!

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BMellert

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Reply with quote  #21 
I know we've beaten this one down ... but since we've been burned by this again in production recently (resulting it way too many emails) I thought I'd bring up again.

Obviously, in this solution I didn't put in the "I ran" flag.  Guess what I'm doing today?  (In addition to contacting the server admins about the clocks not being resynced.)
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kenyon

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Reply with quote  #22 
I just got stung by this one last week.  Thanks for the tips and glad to know it's not something I did.  Looks like I'll be adding a bunch of flags too!

(version 9.1.3.2106)
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Jerome

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Reply with quote  #23 
Even better ...

We have one production system that is doing this for an hour now that DST has started (in the southern hemisphere). It appears to be for a slightly different reason, but could be the same root cause. 10,000 emails sent for each timed action = a whole lot of fun!

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BMellert

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Reply with quote  #24 
Ooo, this reminds me I need to ensure I built the flags into my major process we're trying to finish migrating to V9.  (I had almost forgotten, its in production we've encountered this issue the most.)  While not intended, thanks for the reminder.
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Jerome

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Reply with quote  #25 
They don't come across at all well. Most will need to be replaced to make a sensible system, and then I'd use code to raise them, not the provided VSA. Using a VSA, you have to delete and replace it every time you want to change any parameters.
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BMellert

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Reply with quote  #26 
I know this is an old topic, but had to comment again.
I had a new process with timed loop back actions which sent an email.  I had forgotten to include the "duplicate preventer" on some actions in this solution.  An email was going out on the day DST started/ended this past weekend.  For an entire hour, the loop-back ran sending several thousand of the same email to users -- thankfully only 9 users in this case.  Needless to say that "duplicate preventer" was put in in the middle of the night, though the issue had resolved itself by then.

Ug  :|
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