Hi Karan,

I have recently been investigating adding the pegasus clustering
ability to our workflows. I took a look through the detailed and
useful documentation page here:

http://pegasus.isi.edu/wms/docs/latest/job_clustering.php

I think that both "horizontal" and "label" clustering are things that
we could make use of in our workflows.

I have been able to make use of both individually (ie. creating a
workflow that does only horizontal clustering or only label
clustering). However, there is a specific section of the workflow
where I would like to be able to first apply label clustering and then
apply horizontal clustering.

Trying to do this gives me strange error messages. Rather than put
error messages in an email I created an example here:

/home/spxiwh/testing/test_pegasus_cluster/1102089616-1102863616

on sugar. You can run the failing planning command by doing:

cd /home/spxiwh/testing/test_pegasus_cluster/1102089616-1102863616
./pycbc_basic_pegasus_plan main.dax /usr1/${USER}/log

Note that the planning command works if I only use:

--cluster horizontal

or

--cluster label

but fails, with different errors, with either

--cluster horizontal,label

or

--cluster label,horizontal

What am I doing wrong here?

Cheers
Ian