Sharon,
your last mail made clear that I had misunderstood your mail regarding STAX
V3.3.7. STAX only synchronously submits the PROCESS STOP HANDLE, but that does
not mean, it waits for the process to exit also, right?
Then, STAX never can guarantee that process handles are freed, right?
To me this no longer is a problem. I have implemented my own "catcher" for
unfreed handles: In a try block, a STAXGlobal is predefined to 0 (<script>. In
<process-action> the process' handle is saved to that STAXGlobal. A further
<script> elemnent resets the global to 0 again. In the <finally>, if saved
handle is != 0, the <script> waits while PROCESS FREE HANDLE returns 12, it
breaks the wait loop on 0 or 5 and gives an error message on all other codes.
As a goody it also gives some messages that it is waiting, so you see some
reaction to the termination on STAXMon.
Some similar mechanism could be implemented for <process> switchable via a new
optional element. Hardcoded it would kill my messages :-(
Bodo
________________________________
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: Thursday, July 09, 2009 7:39 PM
To: Strösser, Bodo
Cc: 'staf-users@lists.sourceforge.net'
Subject: RE: [staf-users] How to stop "process-action"
Bodo,
The usual reaction of a running program to SIGINT is to exit. However, in your
example, your command does not exit immediately when encountering a SIGINT.
This is one of the reasons that STAF supports various different stop methods.
For example, if you used the default stop method for the process (SIGKILLALL,),
then the process would have been stopped immediately as STAF runs the kill
command on Unix machines to stop a process. So, if you need a process to be
stopped sooner, you should use a stop method for your process that does this,
like SIGKILLALL (the default stop method).
However, even when using the SIGKILLALL stop method, the PROCESS FREE HANDLE
request that the STAX service submits after the PROCESS STOP HANDLE request may
fail with RC 12 (Process not complete) because even though the command that the
process is running has already been killed, the STAF handle used to run the
process may not have been removed yet because the PROCESS STOP HANDLE request
dispatches calling the handleRemoved(handle) method so that it runs on another
thread, and this thread that deletes the STAF handle may not have completed
yet. I'll investigate how we can better ensure that the STAF process
termination information will be freed in these cases (and probably open another
bug for this).
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/09/2009 04:06 AM
To
Sharon Lucas/Austin/i...@ibmus
cc
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
Subject
RE: [staf-users] How to stop "process-action"
Sharon,
I just updated to 3.3.4/3.3.7, but STAX still does not wait until the process
has exited.
I used a simple process to test it:
<process name="TestProc">
<location>"local"</location>
<command>"/bin/bash"</command>
<parms>'-c "trap \'sleep 25\' SIGINT; sleep 15; sleep 15"'</parms>
<title>"TestProc"</title>
<returnstdout/>
<returnstderr/>
<stopusing>"SIGINT"</stopusing>
</process>
Using 'ps'-command, I can see that SIGINT is catched, 'sleep 25' is executed
and the
second 'sleep 15' after the first 'sleep 15' finished. But STAX does not wait
for the process
to complete but continues its run immediately after the bloch termination
command was
given from STAXMon.
Consequently, 'staf local process list' shows not freed processes after STAXJob
has
finished.
Bodo
________________________________
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: Wednesday, July 08, 2009 8:48 PM
To: Strösser, Bodo
Cc: 'staf-users@lists.sourceforge.net'
Subject: RE: [staf-users] How to stop "process-action"
Not that I know of.
You can view the History of STAF changes in V3.3.4 at
http://staf.sourceforge.net/history.php.
You can view the History of STAX changes in V3.3.7 at
http://staf.sourceforge.net/staxhistory.php.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/08/2009 01:43 PM
To
Sharon Lucas/Austin/i...@ibmus
cc
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
Subject
RE: [staf-users] How to stop "process-action"
Thank you for the hint!
I have 3.3.6 on 3.3.3. Is there any risk upgrading to 3.3.4/3.3.7?
Bodo
________________________________
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: Wednesday, July 08, 2009 8:22 PM
To: Strösser, Bodo
Cc: 'staf-users@lists.sourceforge.net'
Subject: RE: [staf-users] How to stop "process-action"
What version of STAX are you using? Upgrade to STAX V3.3.7 (which requires
STAF V3.3.4 on the STAX service machine).
In STAX V3.3.7, a PROCESS STOP request is submitted synchronously (when
handling a "condition" like terminate), which means that STAX waits for the
PROCESS STOP request to complete before submitting the PROCESS FREE request.
This is because a bug fix was made in STAX V3.3.7 to ensure that process
termination information is always freed and it can't be freed until the process
is actually stopped.
In STAX V3.3.6 or earlier, a PROCESS STOP request is submitted asynchronously
(when handling a "condition" like terminate), which means that STAX does not
wait for the PROCESS STOP request to complete before continuing on (and it was
not freeing processing termination information like it should).
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/08/2009 12:22 PM
To
Sharon Lucas/Austin/i...@ibmus, Bodo <bodo.stroes...@ts.fujitsu.com>
cc
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
Subject
RE: [staf-users] How to stop "process-action"
So it does not wait until the process is actually gone?
I thought I had seen it waiting. Hmm, must have confused myself.
How could I manage to wait? I must be sure to continue only after
the process has exited.
Bodo
________________________________
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: Wednesday, July 08, 2009 7:05 PM
To: "Bodo <bodo.stroes...@ts.fujitsu.com>"@us.ibm.com
Cc: 'staf-users@lists.sourceforge.net'
Subject: Re: [staf-users] How to stop "process-action"
STAX does not distinguish between processes that are successfully stopped and
those that are not. It simply submits a STOP HANDLE request to the PROCESS
service synchronously to stop each process and then submits a FREE HANDLE
request to the PROCESS service asynchronously to free the process's termination
information.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/08/2009 11:57 AM
To
Sharon Lucas/Austin/i...@ibmus
cc
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
Subject
RE: [staf-users] How to stop "process-action"
Sharon,
thank you for the info. I already am using 'stopusing' to send SIGINT instead of
SIGKILL.
What I would like to know is, how does STAX distinguish between processes
that are successfully stopped and those that are not? If a process catches the
SIGINT and does some cleanups before exiting, this might last some time.
Does STAX use a timer while waiting for the process to leave?
Bodo
________________________________
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: Wednesday, July 08, 2009 6:45 PM
To: Strösser, Bodo
Cc: 'staf-users@lists.sourceforge.net'
Subject: RE: [staf-users] How to stop "process-action"
Yes, if you want to check a file being written to by the process while the
process is running, then you could use a <process-action> to do this. Note
that if the process is running a remote machine, then the files the process is
writing to won't reside on the STAX service machine so you couldn't simply so
this via a <script> element. But you could use a <process> element (within the
<process-action> element ) to run command "tail -f FILE | grep XXXX" on the
remote process machine. You could do this in a loop where you can also use a
<stafcmd> element to submit a PROCESS QUERY HANDLE STAXProcessHandle reqeust at
the end of the loop and if it returns RC 48 (does not exist), then you know
that the process is no longer running and you exit the loop so that the
<process-action> task completes.
When a block is terminated and the block contains one or more <process>
elements, STAX submits a PROCESS STOP request to stop a process. See the STAF
User's Guide for more information on the PROCESS service's STOP request. Note
that it will try to stop the process using the default stop method for the
process. STAF provides several different stop methods for processes that are
documented in the STAF User's Guide at
http://staf.sourceforge.net/current/STAFUG.htm#HDRPSSTOP and vary depending on
if the operating system the process is running on is Unix or Windows. You can
override the stop method for STAX to use by specifying the <stopusing>
sub-element for a process.
* stopusing - allows you to specify the method by which this process will be
STOPed, if not overridden on the STOP command. The value is evaluated via
Python to a string. This element is optional.
If the process cannot be stopped via the default stop method (or by the stop
method specified if overridden via the <stopusing> sub-element) then the
process continues running, but STAX views the <process> element as complete and
STAX will continue processing the next element.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/08/2009 11:18 AM
To
Sharon Lucas/Austin/i...@ibmus
cc
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
Subject
RE: [staf-users] How to stop "process-action"
The process itself writes one or more files. I would like to filter the files
for relevant messages and print them to STAXMon. So I think about
some lines of Jython that work similar to "tail -f FILE | grep XXXX" and
use Jython 'print' to bring the output to STAXMon. Does it make
sense to do it in <process-action>?
You said:
If a block is terminated and the block contains one or more <process> elements,
then STAX will attempt to stop the process(es) before terminating the block
(but if a process cannot be terminated, it terminates the block anyway).
I tried some small scenarios. There, when a process catched the
termination signal (e.g. SIGINT), STAX waited for the process'
postprocessing and termination. Did I miss something?
What is the criteria for STAX to suppose that the process cannot be
terminated? Does STAX continue processing behind the block while
the process still is running?
Bodo
________________________________
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: Wednesday, July 08, 2009 5:58 PM
To: Strösser, Bodo
Cc: 'staf-users@lists.sourceforge.net'
Subject: Re: [staf-users] How to stop "process-action"
What is it you want to do within a <process-action> element? If you told me
that I think I could answer your questions better.
The reason you'd want to use the <process-action> element is if you wanted to
interact with the process while it is running. To do that you can use the
STAXProcessHandle variable to obtain the process' handle (if the process was
not started using the 'shell' mode). Note that the STAX User's Guide contains
an example of how to use the <process-action> to send a message via the QUEUE
service to the process (just an example of one thing you can do to interact
with a process via a <process-action>).
Note that if you simply want to know when a process completes, you'll know this
after the <process> element completes and you don't need a <process-action>
element.
If a block is terminated and the block contains one or more <process> elements,
then STAX will attempt to stop the process(es) before terminating the block
(but if a process cannot be terminated, it terminates the block anyway).
I think if you simply try using the <process-action> element, you'll better
understand how it works (if you really have a need to use it).
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
Strösser, Bodo <bodo.stroes...@ts.fujitsu.com>
07/08/2009 09:58 AM
To
"'staf-users@lists.sourceforge.net'" <staf-users@lists.sourceforge.net>
cc
Subject
[staf-users] How to stop "process-action"
Hi,
I would like to have a Jython-<script> running in parallel to a process using
<process-action>.
STAX User Guide tells me 'If the process completes before the task completes,
the process
will remain in a non-complete state until the task completes.'
So, how can the script observe the process to make sure that it exits after the
process has
exited?
And what will happen if the process is killed by a block termination from
STAXMon? AFAICS,
STAX waits for the process to exit after sending the signal. Does it also wait
for termination
of <process-action>?
Best regards
Bodo
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