initial code repo

[stor4nfv.git] / src / ceph / qa / tasks / mds_creation_failure.py

diff --git a/src/ceph/qa/tasks/mds_creation_failure.py b/src/ceph/qa/tasks/mds_creation_failure.py
new file mode 100644 (file)
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+++ b/src/ceph/qa/tasks/mds_creation_failure.py
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+
+import logging
+import contextlib
+import time
+import ceph_manager
+from teuthology import misc
+from teuthology.orchestra.run import CommandFailedError, Raw
+
+log = logging.getLogger(__name__)
+
+
+@contextlib.contextmanager
+def task(ctx, config):
+    """
+    Go through filesystem creation with a synthetic failure in an MDS
+    in its 'up:creating' state, to exercise the retry behaviour.
+    """
+    # Grab handles to the teuthology objects of interest
+    mdslist = list(misc.all_roles_of_type(ctx.cluster, 'mds'))
+    if len(mdslist) != 1:
+        # Require exactly one MDS, the code path for creation failure when
+        # a standby is available is different
+        raise RuntimeError("This task requires exactly one MDS")
+
+    mds_id = mdslist[0]
+    (mds_remote,) = ctx.cluster.only('mds.{_id}'.format(_id=mds_id)).remotes.iterkeys()
+    manager = ceph_manager.CephManager(
+        mds_remote, ctx=ctx, logger=log.getChild('ceph_manager'),
+    )
+
+    # Stop MDS
+    manager.raw_cluster_cmd('mds', 'set', "max_mds", "0")
+    mds = ctx.daemons.get_daemon('mds', mds_id)
+    mds.stop()
+    manager.raw_cluster_cmd('mds', 'fail', mds_id)
+
+    # Reset the filesystem so that next start will go into CREATING
+    manager.raw_cluster_cmd('fs', 'rm', "default", "--yes-i-really-mean-it")
+    manager.raw_cluster_cmd('fs', 'new', "default", "metadata", "data")
+
+    # Start the MDS with mds_kill_create_at set, it will crash during creation
+    mds.restart_with_args(["--mds_kill_create_at=1"])
+    try:
+        mds.wait_for_exit()
+    except CommandFailedError as e:
+        if e.exitstatus == 1:
+            log.info("MDS creation killed as expected")
+        else:
+            log.error("Unexpected status code %s" % e.exitstatus)
+            raise
+
+    # Since I have intentionally caused a crash, I will clean up the resulting core
+    # file to avoid task.internal.coredump seeing it as a failure.
+    log.info("Removing core file from synthetic MDS failure")
+    mds_remote.run(args=['rm', '-f', Raw("{archive}/coredump/*.core".format(archive=misc.get_archive_dir(ctx)))])
+
+    # It should have left the MDS map state still in CREATING
+    status = manager.get_mds_status(mds_id)
+    assert status['state'] == 'up:creating'
+
+    # Start the MDS again without the kill flag set, it should proceed with creation successfully
+    mds.restart()
+
+    # Wait for state ACTIVE
+    t = 0
+    create_timeout = 120
+    while True:
+        status = manager.get_mds_status(mds_id)
+        if status['state'] == 'up:active':
+            log.info("MDS creation completed successfully")
+            break
+        elif status['state'] == 'up:creating':
+            log.info("MDS still in creating state")
+            if t > create_timeout:
+                log.error("Creating did not complete within %ss" % create_timeout)
+                raise RuntimeError("Creating did not complete within %ss" % create_timeout)
+            t += 1
+            time.sleep(1)
+        else:
+            log.error("Unexpected MDS state: %s" % status['state'])
+            assert(status['state'] in ['up:active', 'up:creating'])
+
+    # The system should be back up in a happy healthy state, go ahead and run any further tasks
+    # inside this context.
+    yield