tasks: add TestSessionMap.test_[mount|tell]_conn_close

To check that teardown is happening correctly when
sending commands to an MDS.

Fixes: #14048
Signed-off-by: John Spray <john.spray@redhat.com>

diff --git a/tasks/cephfs/test_sessionmap.py b/tasks/cephfs/test_sessionmap.py
index 5028e5f872022dd95f51d1e479cb59e8e73f144c..11253232dbf845905aa02415db572d4db7b62009 100644 (file)
--- a/tasks/cephfs/test_sessionmap.py
+++ b/tasks/cephfs/test_sessionmap.py
@@ -1,4 +1,4 @@
-
+from StringIO import StringIO
 import json
 import logging
 from tasks.cephfs.cephfs_test_case import CephFSTestCase
@@ -24,6 +24,60 @@ class TestSessionMap(CephFSTestCase):
         ls_data = self.fs.mds_asok(['session', 'ls'])
         self.assertEqual(len(ls_data), 0)
 
+    def _get_thread_count(self, mds_id):
+        remote = self.fs.mds_daemons[mds_id].remote
+
+        ps_txt = remote.run(
+            args=["ps", "axo", "cmd,nlwp"],
+            stdout=StringIO()
+        ).stdout.getvalue().strip()
+        lines = ps_txt.split("\n")[1:]
+
+        for line in lines:
+            if line.find("ceph-mds") != -1:
+                if line.find("-i {0}".format(mds_id)) != -1:
+                    log.info("Found ps line for daemon: {0}".format(line))
+                    return int(line.split()[-1])
+
+        raise RuntimeError("No process found in ps output for MDS {0}: {1}".format(
+            mds_id, ps_txt
+        ))
+
+    def test_tell_conn_close(self):
+        """
+        That when a `tell` command is sent using the python CLI,
+        the thread count goes back to where it started (i.e. we aren't
+        leaving connections open)
+        """
+        self.mount_a.umount_wait()
+        self.mount_b.umount_wait()
+
+        mds_id = self.fs.get_lone_mds_id()
+
+        initial_thread_count = self._get_thread_count(mds_id)
+        self.fs.mon_manager.raw_cluster_cmd("tell", "mds.{0}".format(mds_id), "session", "ls")
+        final_thread_count = self._get_thread_count(mds_id)
+
+        self.assertEqual(initial_thread_count, final_thread_count)
+
+    def test_mount_conn_close(self):
+        """
+        That when a client unmounts, the thread count on the MDS goes back
+        to what it was before the client mounted
+        """
+        self.mount_a.umount_wait()
+        self.mount_b.umount_wait()
+
+        mds_id = self.fs.get_lone_mds_id()
+
+        initial_thread_count = self._get_thread_count(mds_id)
+        self.mount_a.mount()
+        self.assertGreater(self._get_thread_count(mds_id), initial_thread_count)
+        self.mount_a.umount_wait()
+        final_thread_count = self._get_thread_count(mds_id)
+
+        self.assertEqual(initial_thread_count, final_thread_count)
+
     def test_version_splitting(self):
         """
         That when many sessions are updated, they are correctly