[Swift-devel] coasters-hosts.pl script

Fri Mar 2 19:24:38 CST 2012

> Our next task, I think, will be to figure out how to configure Swift
> so that the headnode (where Swift runs) will not require any access to
> intermediate storage (MosaStore). Only the worker nodes will have
> access to intermediate storage. This is to go around the one way
> headnode-worker node connectivity issue.

For this I would try:

- in the .swift script, map the intermediate data to a full path like /mosa/...
- in an fs.data file set /mosa to DIRECT mode

This means that each app that references /mosa will do so from the worker node with no name translation and no intermediate copying or linking. At least thats the intent. We need to make sure that the CDM direct mode achieves this.

The first step is to write a simple example (like a cat to cat copy) and test it in local mode, say using /tmp/mosa, checking its logs and work dir to ensure that direct mode was working as expected.  Then try the same thing on a vanilla cluster (the UBC cluster would be fine) using first /tmp/mosa and then the real /mosa.

After verifying all that, try it on the BG/P.

Two other pre-reqs to check on the BG/P would be:

- is Mosa starting up OK and accessible on the worker nodes
- to check that, verify that ssh-telnet access to the worker nodes is working. It seemed *not* to be on surveyor earlier this week.

Mike

> 
> 
> Any guidance on how to get this configuration would be much
> appreciated.
> 
> 
> 
> Thank you again,
> 
> 
> 
> -Matei
> 
> 
> 
> 
> 
> From: mosastore at googlegroups.com [mailto:mosastore at googlegroups.com]
> On Behalf Of Emalayan Vairavanathan
> Sent: March-02-12 2:32 PM
> To: Jonathan Monette; Justin M Wozniak
> Cc: swift-devel at ci.uchicago.edu Devel; emalayan at ece.ubc.cais ;
> MosaStore
> Subject: Re: [Swift-devel] coasters-hosts.pl script
> 
> 
> 
> 
> 
> Thank you Jon and Justin.
> 
> 
> 
> 
> 
> This is a great news. I will get back to you if I have questions.
> 
> 
> 
> 
> 
> Regards
> 
> 
> Emalayan
> 
> 
> 
> 
> 
> 
> 
> 
> 
> From: Jonathan Monette < jonmon at mcs.anl.gov >
> To: Justin M Wozniak < wozniak at mcs.anl.gov >
> Cc: " swift-devel at ci.uchicago.edu Devel " <
> swift-devel at ci.uchicago.edu >; emalayan at ece.ubc.ca
> Sent: Friday, 2 March 2012 2:21 PM
> Subject: Re: [Swift-devel] coasters-hosts.pl script
> 
> 
> Emalayan,
> We believe we have fixed the issue. You can copy the new
> coasters-hosts.pl script from
> ~jonmon/surveyor/worker-init-test/coasters-hosts.pl
> 
> This script reads the worker logs located in the logs directory. The
> steps to run are as follows:
> start-coaster-service
> <wait for workers to start>
> ./coasters-hosts.pl logs/worker-*.log > worker-hosts.txt
> 
> You MUST clean out the worker logs after you before you start a new
> coaster service to make sure the script searches the right worker log
> files. This may not be ideal at the moment but this will help get you
> started. If you have any other questions feel free to ask. We will
> need to update the mosaswift site with the new information, we will do
> this soon.
> 
> On Mar 2, 2012, at 11:26 AM, Jonathan Monette wrote:
> 
> > Can we match this line: 2012/03/02 17:16:04.712 INFO - Running on
> > node 172.18.1.83 from the worker log,
> > instead of this line: 2012-03-02 17:21:25,214+0000 DEBUG Cpu worker
> > started: block=2012.0302.171344.704 host=172.18.1.83 id=0 from the
> > cps log?
> >
> > They both provide the same ip addresses. And the worker log always
> > has that ip address before the cps log does.
> >
> > On Mar 2, 2012, at 11:15 AM, Jonathan Monette wrote:
> >
> >> That fix still did not work. I had moved it to the same spot. It is
> >> still waiting for the worker-init.pl script to finish before the ip
> >> addresses are printed to the cps log. Those ip addresses are what
> >> is needed by the coaster-hosts.pl script to finish. If I create an
> >> empty file for the coaster-host.pl script to read, then the work
> >> continues and the ip addresses show up in the cps log.
> >>
> >> Why is log4j waiting to add those lines to the cps log after the
> >> worker-init.pl script is finished?
> >>
> >> On Mar 2, 2012, at 11:05 AM, Jonathan Monette wrote:
> >>
> >>> Thanks, in my copy I thought I had moved the reconnect to before
> >>> the init-cmd and it still wasn't working. I will test with your
> >>> change. I just verified that it was indeed waiting for the
> >>> worker-init.pl script to finish. I created an empty file for the
> >>> script to read and it finished connecting and the ip addresses I
> >>> needed were added to the cps log. I will also be testing your fix.
> >>>
> >>> On Mar 2, 2012, at 11:01 AM, Justin M Wozniak wrote:
> >>>
> >>>>
> >>>> Yes- I must have tested this with a different log file. I just
> >>>> checked in and installed in ~wozniak/Public a fix for this that
> >>>> launches WORKER_INIT_CMD after the reconnect(). I am a little
> >>>> worried about time outs but it works so far. I will continue
> >>>> testing...
> >>>> Justin
> >>>>
> >>>> On Thu, 1 Mar 2012, Jonathan Monette wrote:
> >>>>
> >>>>> Justin,
> >>>>> So I have been trying to help Emalayan get the host list file
> >>>>> for the worker-init.pl script. It seems the cps log file is not
> >>>>> providing the ip addresses for the coasters-hosts.pl script. I
> >>>>> thought this was maybe because we did not have the correct log4j
> >>>>> setting set but we have the Coaster service Cpu set to DEBUG. So
> >>>>> for some reason the workers are not connecting to the service.
> >>>>> When I comment out the export WORKER_ENVIRONEMTN="…" line in the
> >>>>> coaster-service.conf file I see the workers connect and the cps
> >>>>> log file shows there ip addresses. However when setting this
> >>>>> line it seems they are not connecting.
> >>>>>
> >>>>> Emalayan thought there might be some sort of circular dependency
> >>>>> going with the host-list file and the worker. The worker
> >>>>> requires the host-list file so that it can run the
> >>>>> worker-init.pl script and then connect but the host-list file
> >>>>> cannot be generated because the workers cannot connect. I
> >>>>> noticed in your swift-test directory the cps files did have the
> >>>>> ip addresses set and coasters-hosts.pl found the ip addresses
> >>>>> and reported them. Did you try that test with setting the
> >>>>> WORKER_ENVIRONMENT variable in the coaster-service.conf file?
> >>>>> Any idea what may be happening? The job is running when looking
> >>>>> under cqstat.
> >>>>>
> >>>>> A side note: At the mosaswift site, your example talks about
> >>>>> running the coasters-hosts.pl on the cps log but the example you
> >>>>> provide runs it on logs/coasters.log. This may need to be
> >>>>> changed. Also, should provide the log4j setting that is required
> >>>>> to generate the Cpu line with the worker ip address just to
> >>>>> clarify that this line should be set for this script to work.
> >>>>>
> >>>>> For reference, this line:
> >>>>> log4j.logger.org.globus.cog.abstraction.coaster.service.job.manager.Cpu=DEBUG
> >>>>
> >>>> --
> >>>> Justin M Wozniak
> >>>
> >>> _______________________________________________
> >>> Swift-devel mailing list
> >>> Swift-devel at ci.uchicago.edu
> >>> https://lists.ci.uchicago.edu/cgi-bin/mailman/listinfo/swift-devel
> >>
> >> _______________________________________________
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> >
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> 
> 
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-- 
Michael Wilde
Computation Institute, University of Chicago
Mathematics and Computer Science Division
Argonne National Laboratory