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"""
Thrash -- Simulate random osd failures.
"""
import contextlib
import logging
import gevent
import time
import random
log = logging.getLogger(__name__)
@contextlib.contextmanager
def task(ctx, config):
"""
"Thrash" snap creation and removal on the listed pools
Example:
thrash_pool_snaps:
pools: [.rgw.buckets, .rgw.buckets.index]
max_snaps: 10
min_snaps: 5
period: 10
"""
stopping = False
def do_thrash():
pools = config.get('pools', [])
max_snaps = config.get('max_snaps', 10)
min_snaps = config.get('min_snaps', 5)
period = config.get('period', 30)
snaps = []
manager = ctx.managers['ceph']
def remove_snap():
assert len(snaps) > 0
snap = random.choice(snaps)
log.info("Removing snap %s" % (snap,))
for pool in pools:
manager.remove_pool_snap(pool, str(snap))
snaps.remove(snap)
def add_snap(snap):
log.info("Adding snap %s" % (snap,))
for pool in pools:
manager.add_pool_snap(pool, str(snap))
snaps.append(snap)
index = 0
while not stopping:
index += 1
time.sleep(period)
if len(snaps) <= min_snaps:
add_snap(index)
elif len(snaps) >= max_snaps:
remove_snap()
else:
random.choice([lambda: add_snap(index), remove_snap])()
log.info("Stopping")
thread = gevent.spawn(do_thrash)
yield
stopping = True
thread.join()
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