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Kill the ctdb_mutex_ceph_rados_helper with SIGKILL and then confirm
that the lock is automatically released following expiry.
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Samuel Cabrero <scabrero@suse.de>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Thu Aug 9 16:26:36 CEST 2018 on sn-devel-144
(cherry picked from commit 4abf348ec4cbb78d3216d5e8c5f3020d4499f10a)
RADOS locks without expiry persist indefinitely. This results in CTDB
deadlock during failover if the recovery master dies unexpectedly, as
subsequently elected recovery master nodes can't obtain the recovery
lock.
Avoid deadlock by using a lock expiration time (10s by default), and
renewing it periodically.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=13540
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Samuel Cabrero <scabrero@suse.de>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
(cherry picked from commit ce289e89e5c469cf2c5626dc7f2666b945dba3bd)
In preparation for adding a lock refresh timer.
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Samuel Cabrero <scabrero@suse.de>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
(cherry picked from commit 91a89c146453ca203a83dc2ba555bb93276c4d7f)
Set a handler for SIGINT to release the lock.
Signed-off-by: Samuel Cabrero <scabrero@suse.de>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
(cherry picked from commit 85706bd27535eaa4ec653f99b1910fbd8f2aab88)
This standalone test script performs the following:
- using ctdb_mutex_ceph_rados_helper, take a lock on the Ceph RADOS
object a CLUSTER/$POOL/$OBJECT using the Ceph keyring for $USER
+ confirm that lock is obtained, via ctdb_mutex_ceph_rados_helper "0"
output
- check RADOS object lock state, using the "rados lock info" command
- attempt to obtain the lock again, using ctdb_mutex_ceph_rados_helper
+ confirm that the lock is not successfully taken
- tell the first locker to drop the lock and exit, via SIGTERM
- once the first locker has exited, attempt to get the lock again
+ confirm that this attempt succeeds
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Autobuild-User(master): Amitay Isaacs <amitay@samba.org>
Autobuild-Date(master): Fri Dec 9 07:59:33 CET 2016 on sn-devel-144
ctdb_mutex_ceph_rados_helper implements the cluster mutex helper API
atop Ceph using the librados rados_lock_exclusive()/rados_unlock()
functionality.
Once configured, split brain avoidance during CTDB recovery will be
handled using locks against an object located in a Ceph RADOS pool.
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
