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About DLQ and BOQ?

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anon_kb

Posted: Wed May 11, 2016 4:40 am Post subject: About DLQ and BOQ?

Acolyte

Joined: 13 Nov 2014
Posts: 74

Hi guys,

I have this 1 task on which I don't know if its possible

Situation

There's 1 application that sends input xml message to the WMB and that application sends useless and legit message. The problem is all the useless and errors encountered on legit message goes directly to BackOut Queue and overflows the BOQ which is not good according to them.
I'm not really that good into this kind of issue. Hope you can enlighten me.

Question:
1. When will be the time that error messages encountered on runtime goes to DLQ?

2. Is it possible to filter this? Like useless message will be discarded and legit error message goes to backout queue.

3. Is there any other way to solve this?

Thanks for your help.

mqjeff

Posted: Wed May 11, 2016 5:19 am Post subject:

Grand Master

Joined: 25 Jun 2008
Posts: 17447

Error messages go to the backout queue from the MQInput node.

Messages go as far through the flow as you let them. An easy way to stop letting a message go further is to return false.
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Vitor

Posted: Wed May 11, 2016 5:35 am Post subject: Re: About DLQ and BOQ?

Grand High Poobah

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

anon_kb wrote:

1. When will be the time that error messages encountered on runtime goes to DLQ?

When the BOQ is full. It's a bad thing indeed; the DLQ should only contain undeliverable messages - I'm with "them" on this one.

anon_kb wrote:

2. Is it possible to filter this? Like useless message will be discarded and legit error message goes to backout queue.

Use the method described by my most worthy associate. Once you've detected a useless message in an ESQL Compute node, return false.

anon_kb wrote:

3. Is there any other way to solve this?

That's the best one. Obviously the BOQ should be sized appropriate to hold all the "legit" error messages for as long as it takes your business process to clear them. Consider another process that unloads the BOQ into a database or other searchable long term storage for processing.
_________________
Honesty is the best policy.
Insanity is the best defence.

smdavies99

Posted: Wed May 11, 2016 6:37 am Post subject: Re: About DLQ and BOQ?

Jedi Council

Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.

Vitor wrote:

Consider another process that unloads the BOQ into a database or other searchable long term storage for processing.

That is eactly what we do. We have a number of data feeds from old systems/sites that come in a semi-variable flat file format. There are often missing spaces in the data that make it unparseable.
We keep them in the BOQ for up to 24 hours then they are read off and put into a DB along with the error log description for resolution should the client come asking why their data was rejected.
The data is held in the DB (with a custom app to display them) for up to a year.

so far in 3 years not one reject has been questioned but is always good to have the evidence to hand to be able to answer the questions.
_________________
WMQ User since 1999
MQSI/WBI/WMB/'Thingy' User since 2002
Linux user since 1995

Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions.

anon_kb

Posted: Wed May 11, 2016 8:50 pm Post subject:

Acolyte

Joined: 13 Nov 2014
Posts: 74

Thanks for your reply guys. I'll try this and I will give you some feedback after

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