Hi Shilpa, Ali, and list,
The rgw multisite tests are currently running out of
src/test/rgw/test_multi.py, and use shell scripts to set up multiple
vstart clusters. We'd like to adapt these tests so they can run inside
of teuthology as well (while preserving the ability to run them
manually). Running inside of teuthology means using an existing
multisite configuration, rather than building one up with the shell scripts.
The python script currently has classes for RGWRealm, RGWCluster, and
RGWMulti. The RGWMulti.setup() method creates an RGWRealm and builds an
array of RGWClusters. RGWCluster.start() calls the mstart.sh script to
create a vstart cluster in a subdirectory. RGWRealm.init_zone() is then
running all of the radosgw-admin commands to configure that
zonegroup/zone/etc.
These seem like good base classes for this abstraction. For example, we
can derive VRealm/VCluster/VMulti to represent the existing vstart
implementation, and TRealm/TCluster/TMulti to represent their teuthology
counterparts.
The existing unit tests only need to know the realm, which they access
as a global variable. We can turn the generic part (the test_* functions
and their helper functions like check_*) into a separate module like
src/test/rgw/rgw_multi.py, and add a set_realm() function to set this
global variable.
Then the vstart version of the test (src/test/rgw/test_multi.py) can
import rgw_multi, instantiate its VRealm/etc to run the cluster
creation/configuration, then pass its realm to set_realm() for the unit
tests. In order for nosetests to find and run the test_* functions in
rgw_multi.py, test_multi.py needs to use 'from rgw_multi import *'.
A separate python script, probably under qa/tasks/, would implement the
TRealm/etc subclasses by making the appropriate calls into teuthology.
Instead of creating the cluster during initialization, it would read the
existing multisite configuration - either by interpreting the teuthology
'config', or by running radosgw-admin commands like 'period get'.
It seems like a good first step would be to split out the generic code
from test_multi.py into rgw_multi.py and verify that the vstart version
still works.
Casey
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