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"""
Prepare MDS cluster for upgrade.
"""
import logging
from tasks.cephfs.filesystem import Filesystem
log = logging.getLogger(__name__)
def task(ctx, config):
"""
Prepare MDS cluster for upgrade.
This task reduces ranks to 1 and stops all standbys.
"""
if config is None:
config = {}
assert isinstance(config, dict), \
'snap-upgrade task only accepts a dict for configuration'
fs = Filesystem(ctx)
fs.getinfo() # load name
fs.set_allow_standby_replay(False)
fs.set_max_mds(1)
fs.reach_max_mds()
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