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"""
Prepare MDS cluster for upgrade.
"""
import logging
import time
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)
status = fs.getinfo()
fs.set_max_mds(1)
fs.reach_max_mds()
# Stop standbys now to minimize time rank 0 is down in subsequent:
# tasks:
# - ceph.stop: [mds.*]
rank0 = fs.get_rank(rank=0, status=status)
for daemon in ctx.daemons.iter_daemons_of_role('mds', fs.mon_manager.cluster):
if rank0['name'] != daemon.id_:
daemon.stop()
for i in range(1, 10):
time.sleep(5) # time for FSMap to update
status = fs.getinfo()
if len(list(status.get_standbys())) == 0:
break
assert(len(list(status.get_standbys())) == 0)
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