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# Copyright (C) 2021 Red Hat, Inc. <http://www.redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along`
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
from glusto.core import Glusto as g
from glustolibs.gluster.gluster_base_class import GlusterBaseClass, runs_on
from glustolibs.gluster.exceptions import ExecutionError
from glustolibs.gluster.volume_libs import shrink_volume
from glustolibs.io.utils import collect_mounts_arequal
@runs_on([['distributed'], ['glusterfs']])
class TestRebalanceMultipleShrinks(GlusterBaseClass):
def setUp(self):
self.get_super_method(self, 'setUp')()
# Changing dist_count to 6
self.volume['voltype']['dist_count'] = 6
# Setup Volume
if not self.setup_volume_and_mount_volume([self.mounts[0]]):
raise ExecutionError("Failed to Setup and mount volume")
self.first_client = self.mounts[0].client_system
def tearDown(self):
# Unmount and clean volume
if not self.unmount_volume_and_cleanup_volume([self.mounts[0]]):
raise ExecutionError("Failed to Cleanup Volume")
# Calling GlusterBaseClass tearDown
self.get_super_method(self, 'tearDown')()
def test_rebalance_multiple_shrinks(self):
"""
Test case:
1. Modify the distribution count of a volume
2. Create a volume, start it and mount it
3. Create some file on mountpoint
4. Collect arequal checksum on mount point pre-rebalance
5. Do the following 3 times:
6. Shrink the volume
7. Collect arequal checksum on mount point post-rebalance
and compare with value from step 4
"""
# Create some file on mountpoint
cmd = ("cd %s; for i in {1..500} ; do "
"dd if=/dev/urandom of=file$i bs=10M count=1; done"
% self.mounts[0].mountpoint)
ret, _, _ = g.run(self.first_client, cmd)
self.assertEqual(ret, 0, "IO failed on volume %s"
% self.volname)
# Collect arequal checksum before rebalance
arequal_checksum_before = collect_mounts_arequal(self.mounts[0])
for _ in range(3):
# Shrink volume
ret = shrink_volume(self.mnode, self.volname,
rebalance_timeout=16000)
self.assertTrue(ret, "Failed to remove-brick from volume")
g.log.info("Remove-brick rebalance successful")
# Collect arequal checksum after rebalance
arequal_checksum_after = collect_mounts_arequal(self.mounts[0])
# Check for data loss by comparing arequal before and after
# rebalance
self.assertEqual(arequal_checksum_before, arequal_checksum_after,
"arequal checksum is NOT MATCHNG")
g.log.info("arequal checksum is SAME")
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