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# Copyright (C) 2020 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.
import string
from random import choice
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.brick_libs import get_all_bricks
from glustolibs.gluster.dht_test_utils import find_hashed_subvol
from glustolibs.gluster.lib_utils import get_usable_size_per_disk
from glustolibs.gluster.rebalance_ops import (rebalance_start,
wait_for_rebalance_to_complete)
from glustolibs.gluster.volume_libs import get_subvols, expand_volume
from glustolibs.gluster.volume_ops import set_volume_options
@runs_on([['distributed-replicated', 'distributed-arbiter'], ['glusterfs']])
class TestBrickFullAddBrickRebalance(GlusterBaseClass):
def setUp(self):
self.get_super_method(self, 'setUp')()
# Creating Volume and mounting the volume
ret = self.setup_volume_and_mount_volume([self.mounts[0]])
if not ret:
raise ExecutionError("Volume creation or mount failed: %s"
% self.volname)
def tearDown(self):
# Unmounting and cleaning volume
ret = self.unmount_volume_and_cleanup_volume([self.mounts[0]])
if not ret:
raise ExecutionError("Unable to delete volume %s" % self.volname)
self.get_super_method(self, 'tearDown')()
@staticmethod
def _get_random_string():
letters = string.ascii_lowercase
return ''.join(choice(letters) for _ in range(5))
def test_brick_full_add_brick_rebalance(self):
"""
Test case:
1. Create a volume, start it and mount it.
2. Create a data set on the client node such that all the available
space is used and "No space left on device" error is generated.
3. Set cluster.min-free-disk to 30%.
4. Add bricks to the volume, trigger rebalance and wait for rebalance
to complete.
"""
# Create a data set on the client node such that all the available
# space is used and "No space left on device" error is generated
bricks = get_all_bricks(self.mnode, self.volname)
# Calculate the usable size and fill till it reaches
# min free limit
usable_size = get_usable_size_per_disk(bricks[0])
subvols = get_subvols(self.mnode, self.volname)['volume_subvols']
filename = "abc"
for subvol in subvols:
while (subvols[find_hashed_subvol(subvols, "/", filename)[1]] ==
subvol):
filename = self._get_random_string()
ret, _, _ = g.run(self.mounts[0].client_system,
"fallocate -l {}G {}/{}".format(
usable_size, self.mounts[0].mountpoint,
filename))
self.assertFalse(ret, "Failed to fill disk to min free limit")
g.log.info("Disk filled up to min free limit")
# Try to perfrom I/O from mount point(This should fail)
ret, _, _ = g.run(self.mounts[0].client_system,
"fallocate -l 5G {}/mfile".format(
self.mounts[0].mountpoint))
self.assertTrue(ret,
"Unexpected: Able to do I/O even when disks are "
"filled to min free limit")
g.log.info("Expected: Unable to perfrom I/O as min free disk is hit")
# Set cluster.min-free-disk to 30%
ret = set_volume_options(self.mnode, self.volname,
{'cluster.min-free-disk': '30%'})
self.assertTrue(ret, "Failed to set cluster.min-free-disk to 30%")
# Add brick to volume
ret = expand_volume(self.mnode, self.volname, self.servers,
self.all_servers_info)
self.assertTrue(ret, "Failed to add brick on volume %s"
% self.volname)
# Trigger rebalance and wait for it to complete
ret, _, _ = rebalance_start(self.mnode, self.volname,
force=True)
self.assertEqual(ret, 0, "Failed to start rebalance on the volume %s"
% self.volname)
# Wait for rebalance to complete
ret = wait_for_rebalance_to_complete(self.mnode, self.volname,
timeout=1200)
self.assertTrue(ret, "Rebalance is not yet complete on the volume "
"%s" % self.volname)
g.log.info("Rebalance successfully completed")
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