[Test] Change the reserve limits to lower and higher while rebal in-progress

1) Create a distributed-replicated volume and start it.
2) Enable storage.reserve option on the volume using below command,
    gluster volume set storage.reserve 50
3) Mount the volume on a client
4) Add some data on the mount point (should be within reserve limits)
5) Now, add-brick and trigger rebalance.
    While rebalance is in-progress change the reserve limit to a lower
    value say (30)
6. Stop the rebalance
7. Reset the storage reserve value to 50 as in step 2
8. trigger rebalance
9. while rebalance in-progress change the reserve limit to a higher
    value say (70)

Change-Id: I1b2e449f74bb75392a25af7b7088e7ebb95d2860
Signed-off-by: “Milind <“mwaykole@redhat.com”>

1 files changed, 127 insertions, 0 deletions

diff --git a/tests/functional/glusterd/test_reserve_limt_change_while_rebalance.py b/tests/functional/glusterd/test_reserve_limt_change_while_rebalance.py
new file mode 100644
index 000000000..2a7aacdac
--- /dev/null
+++ b/tests/functional/glusterd/test_reserve_limt_change_while_rebalance.py
@@ -0,0 +1,127 @@
+#  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.
+
+from glustolibs.gluster.exceptions import ExecutionError
+from glustolibs.gluster.gluster_base_class import GlusterBaseClass, runs_on
+from glustolibs.gluster.glusterdir import mkdir
+from glustolibs.gluster.rebalance_ops import (
+    rebalance_start,
+    rebalance_stop,
+    wait_for_rebalance_to_complete
+)
+from glustolibs.gluster.volume_libs import expand_volume
+from glustolibs.gluster.volume_ops import set_volume_options
+from glustolibs.io.utils import run_linux_untar
+
+
+@runs_on([['distributed-replicated'], ['glusterfs']])
+class TestReserveLimitChangeWhileRebalance(GlusterBaseClass):
+
+    def _set_vol_option(self, option):
+        """Method for setting volume option"""
+        ret = set_volume_options(
+            self.mnode, self.volname, option)
+        self.assertTrue(ret)
+
+    @classmethod
+    def setUpClass(cls):
+        # Calling GlusterBaseClass setUpClass
+        cls.get_super_method(cls, 'setUpClass')()
+
+        # Set I/O flag to false
+        cls.is_io_running = False
+
+        # Setup Volume and Mount Volume
+        ret = cls.setup_volume_and_mount_volume(mounts=cls.mounts)
+        if not ret:
+            raise ExecutionError("Failed to Setup_Volume and Mount_Volume")
+
+    def tearDown(self):
+        if not wait_for_rebalance_to_complete(
+                self.mnode, self.volname, timeout=300):
+            raise ExecutionError(
+                "Failed to complete rebalance on volume '{}'".format(
+                    self.volname))
+
+        # 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')()
+
+    def test_reserve_limt_change_while_rebalance(self):
+        """
+        1) Create a distributed-replicated volume and start it.
+        2) Enable storage.reserve option on the volume using below command,
+           gluster volume set storage.reserve 50
+        3) Mount the volume on a client
+        4) Add some data on the mount point (should be within reserve limits)
+        5) Now, add-brick and trigger rebalance.
+           While rebalance is in-progress change the reserve limit to a lower
+           value say (30)
+        6. Stop the rebalance
+        7. Reset the storage reserve value to 50 as in step 2
+        8. trigger rebalance
+        9. while rebalance in-progress change the reserve limit to a higher
+         value say (70)
+        """
+
+        # Setting storage.reserve 50
+        self._set_vol_option({"storage.reserve": "50"})
+
+        self.list_of_io_processes = []
+        # Create a dir to start untar
+        self.linux_untar_dir = "{}/{}".format(self.mounts[0].mountpoint,
+                                              "linuxuntar")
+        ret = mkdir(self.clients[0], self.linux_untar_dir)
+        self.assertTrue(ret, "Failed to create dir linuxuntar for untar")
+
+        # Start linux untar on dir linuxuntar
+        ret = run_linux_untar(self.clients[0], self.mounts[0].mountpoint,
+                              dirs=tuple(['linuxuntar']))
+        self.list_of_io_processes += ret
+        self.is_io_running = True
+
+        # Add bricks to the volume
+        ret = expand_volume(self.mnode, self.volname, self.servers,
+                            self.all_servers_info)
+        self.assertTrue(ret, "Failed to add brick with rsync on volume %s"
+                        % self.volname)
+
+        # Trigger rebalance on the volume
+        ret, _, _ = rebalance_start(self.mnode, self.volname)
+        self.assertEqual(ret, 0, "Failed to start rebalance on the volume %s"
+                         % self.volname)
+
+        # Setting storage.reserve 30
+        self._set_vol_option({"storage.reserve": "30"})
+
+        # Stopping Rebalance
+        ret, _, _ = rebalance_stop(self.mnode, self.volname)
+        self.assertEqual(ret, 0, "Failed to stop rebalance on the volume %s"
+                         % self.volname)
+
+        # Setting storage.reserve 500
+        self._set_vol_option({"storage.reserve": "500"})
+
+        # Trigger rebalance on the volume
+        ret, _, _ = rebalance_start(self.mnode, self.volname)
+        self.assertEqual(ret, 0, "Failed to start rebalance on the volume %s"
+                         % self.volname)
+
+        # Setting storage.reserve 70
+        self._set_vol_option({"storage.reserve": "70"})