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| klabran |
 Posted: Thu Jan 13, 2005 8:35 am Post subject: Trace file locked? |
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Master
Joined: 19 Feb 2004
Posts: 259
Location: Flagstaff AZ
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Every time I have a trace file created from a flow I can't rename it because it is locked/in use????
If I redeploy the flow that the trace was generated from then I can rename it. Is this normal? Is there a way around this?
I am on MQSI 2.1.
Kevin |
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| jefflowrey |
| Posted: Thu Jan 13, 2005 8:46 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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It's normal. The broker opens the file for reading and writing, and keeps it that way until it is sure it's done.
You can do things to clear the file, but you can't rename it and you can't delete it once the broker has started to use it.
_________________
I am *not* the model of the modern major general. |
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| klabran |
| Posted: Thu Jan 13, 2005 8:48 am Post subject: |
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Master
Joined: 19 Feb 2004
Posts: 259
Location: Flagstaff AZ
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My experience is that it locks it for a long amount of time.... last instance was about 2+ hours.
Is there a way to decrease the lock time? |
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| jefflowrey |
| Posted: Thu Jan 13, 2005 8:52 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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I don't think it ever releases the lock "on it's own".
If you redeploy, you are forcing the lock to be released, because you are stopping and deleting the trace node that has it open, and then reinitializing the trace node.
There's no way, that I know of, to force any application to release a file lock, other than to close it down normally - or restart the system.
It *is* possible to overwrite the contents of the file while the TraceNode has it locked, however. You can do this with Notepad, you can do this with other things - as long as they don't try to delete the old file and write a new one.
If you want to do things like archive the contents on a daily basis, you will need to copy the contents into a new file, and then overwrite the current file with empty data.
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I am *not* the model of the modern major general. |
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| klabran |
| Posted: Thu Jan 13, 2005 8:55 am Post subject: |
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Master
Joined: 19 Feb 2004
Posts: 259
Location: Flagstaff AZ
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| kirani |
| Posted: Thu Jan 13, 2005 11:34 pm Post subject: |
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Jedi Knight
Joined: 05 Sep 2001
Posts: 3779
Location: Torrance, CA, USA
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Have you tried using mqsireload command. I'm guessing that it will release the lock on the trace file. I never tried it though.
_________________
Kiran
IBM Cert. Solution Designer & System Administrator - WBIMB V5
IBM Cert. Solutions Expert - WMQI
IBM Cert. Specialist - WMQI, MQSeries
IBM Cert. Developer - MQSeries
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| martinrydman |
| Posted: Thu Jan 13, 2005 11:50 pm Post subject: |
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Centurion
Joined: 30 Jan 2004
Posts: 139
Location: Gothenburg, Sweden
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In a development scenario, there's also the rather unsofisticated forced termination of the DataFlowEngine (using task manager). The broker will automatically restart the engine immediately, but the lock is gone until a message triggers the first instance of the flow that locked the file. I've done this for years without any adverse effects.
This is *not* recommended in a production environment though... 
/Martin |
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| Tibor |
| Posted: Fri Jan 14, 2005 6:06 am Post subject: |
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Grand Master
Joined: 20 May 2001
Posts: 1033
Location: Hungary
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Kevin,
You can do the renaming the next way: (on unix)
| Code: |
cp tracefile tracefile_copy
cp /dev/null tracefile |
Tibor |
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| klabran |
| Posted: Thu Jan 20, 2005 10:22 am Post subject: |
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Master
Joined: 19 Feb 2004
Posts: 259
Location: Flagstaff AZ
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Thanks again for everyone's input. It looks like I have a few options....
Kevin |
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| tillywern |
| Posted: Fri Jan 21, 2005 9:15 am Post subject: Don't forget strange permissions on the trace files. |
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Centurion
Joined: 28 Jan 2003
Posts: 109
Location: Colorado
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It appears that trance files also inherrit ownership from the user that initiates the request. SO it is possible to have a group of developers where when developer A sets a trace then Developer B cannot change it.
Usually this happens whn you have strange security standards, as we have with my current client. |
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| kirani |
| Posted: Sun Jan 23, 2005 2:50 pm Post subject: |
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Jedi Knight
Joined: 05 Sep 2001
Posts: 3779
Location: Torrance, CA, USA
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I'd assume that the Broker Service user-id will have permissions to the folder where the trace files are created. If someone want's to overwrite the trace files, they should also have write permissions to the same directory/file.
_________________
Kiran
IBM Cert. Solution Designer & System Administrator - WBIMB V5
IBM Cert. Solutions Expert - WMQI
IBM Cert. Specialist - WMQI, MQSeries
IBM Cert. Developer - MQSeries
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