[Test] Add TC to rebalance highly nested dir structure

Test case:
1. Create a volume, start it and mount it
2. On mount point, create a large nested dir structure with files in the
inner-most dir
3. Collect arequal checksum on mount point pre-rebalance
4. Expand the volume
5. Start rebalance and wait for it to finish
6. Collect arequal checksum on mount point post-rebalance and compare
wth value from step 3

Change-Id: I87f0e8df8c4ca850bdf749583635fc8cd2ba1b86
Signed-off-by: Barak Sason Rofman <bsasonro@redhat.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/tests/functional/dht/test_rebalance_nested_dir.py b/tests/functional/dht/test_rebalance_nested_dir.py
new file mode 100644
index 000000000..77f099ad3
--- /dev/null
+++ b/tests/functional/dht/test_rebalance_nested_dir.py
@@ -0,0 +1,99 @@
+#  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 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.rebalance_ops import (
+    rebalance_start, wait_for_rebalance_to_complete)
+from glustolibs.gluster.volume_libs import expand_volume
+from glustolibs.io.utils import collect_mounts_arequal
+
+
+@runs_on([['distributed', 'distributed-replicated'],
+          ['glusterfs']])
+class TestRebalanceNestedDir(GlusterBaseClass):
+
+    def setUp(self):
+
+        self.get_super_method(self, 'setUp')()
+
+        # 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_nested_dir(self):
+        """
+        Test case:
+        1. Create a volume, start it and mount it
+        2. On mount point, create a large nested dir structure with
+        files in the inner-most dir
+        3. Collect arequal checksum on mount point pre-rebalance
+        4. Expand the volume
+        5. Start rebalance and wait for it to finish
+        6. Collect arequal checksum on mount point post-rebalance
+           and compare wth value from step 3
+        """
+
+        # create a large nested dir structure with files in the inner-most dir
+        cmd = ("cd %s; for i in {1..100} ; do mkdir $i; cd $i; done;"
+               "for j in {1..100} ; do "
+               "dd if=/dev/urandom of=file$j 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])
+
+        # 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")
+
+        # 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")