[ClusterLabs] Pacemaker reload Master/Slave resource

[Felix Zachlod (Lists)]

version 1.1.13-10.el7_2.2-44eb2dd

Hello!

I am currently developing a master/slave resource agent. So far it is working just fine, but this resource agent implements reload() and this does not work as expected when running as Master:
The reload action is invoked and it succeeds returning 0. The resource is still Master and monitor will return $OCF_RUNNING_MASTER.

But Pacemaker considers the instance being slave afterwards. Actually only reload is invoked, no monitor, no demote etc.

I first thought that reload should possibly return $OCF_RUNNING_MASTER too but this leads to the resource failing on reload. It seems 0 is the only valid return code.

I can recover the cluster state running resource $resourcename promote, which will call

notify
promote
notify

Afterwards my resource is considered Master again. After  PEngine Recheck Timer (I_PE_CALC) just popped (900000ms), the cluster manager will promote the resource itself.
But this can lead to unexpected results, it could promote the resource on the wrong node so that both sides are actually running master, the cluster will not even notice it does not call monitor either.

Is this a bug?

regards, Felix


trace   May 20 12:58:31 cib_create_op(609):0: Sending call options: 00100000, 1048576
trace   May 20 12:58:31 cib_native_perform_op_delegate(384):0: Sending cib_modify message to CIB service (timeout=120s)
trace   May 20 12:58:31 crm_ipc_send(1175):0: Sending from client: cib_shm request id: 745 bytes: 1070 timeout:120000 msg...
trace   May 20 12:58:31 crm_ipc_send(1188):0: Message sent, not waiting for reply to 745 from cib_shm to 1070 bytes...
trace   May 20 12:58:31 cib_native_perform_op_delegate(395):0: Reply: No data to dump as XML
trace   May 20 12:58:31 cib_native_perform_op_delegate(398):0: Async call, returning 268
trace   May 20 12:58:31 do_update_resource(2274):0: Sent resource state update message: 268 for reload=0 on scst_dg_ssd
trace   May 20 12:58:31 cib_client_register_callback_full(606):0: Adding callback cib_rsc_callback for call 268
trace   May 20 12:58:31 process_lrm_event(2374):0: Op scst_dg_ssd_reload_0 (call=449, stop-id=scst_dg_ssd:449, remaining=3): Confirmed
notice  May 20 12:58:31 process_lrm_event(2392):0: Operation scst_dg_ssd_reload_0: ok (node=alpha, call=449, rc=0, cib-update=268, confirmed=true)
debug   May 20 12:58:31 update_history_cache(196):0: Updating history for 'scst_dg_ssd' with reload op
trace   May 20 12:58:31 crm_ipc_read(992):0: No message from lrmd received: Resource temporarily unavailable
trace   May 20 12:58:31 mainloop_gio_callback(654):0: Message acquisition from lrmd[0x22b0ec0] failed: No message of desired type (-42)
trace   May 20 12:58:31 crm_fsa_trigger(293):0: Invoked (queue len: 0)
trace   May 20 12:58:31 s_crmd_fsa(159):0: FSA invoked with Cause: C_FSA_INTERNAL       State: S_NOT_DC
trace   May 20 12:58:31 s_crmd_fsa(246):0: Exiting the FSA
trace   May 20 12:58:31 crm_fsa_trigger(295):0: Exited  (queue len: 0)
trace   May 20 12:58:31 crm_ipc_read(989):0: Received cib_shm event 2108, size=183, rc=183, text: <cib-reply t="cib" cib_op="cib_modify" cib_callid="268" cib_clientid="60010689-7350-4916-a7bd-bd85ff
trace   May 20 12:58:31 mainloop_gio_callback(659):0: New message from cib_shm[0x23b7ab0] = 143
trace   May 20 12:58:31 cib_native_dispatch_internal(100):0: dispatching 0x22b2370
trace   May 20 12:58:31 cib_native_dispatch_internal(116):0: Activating cib callbacks...
trace   May 20 12:58:31 cib_native_callback(649):0: Invoking callback cib_rsc_callback for call 268
trace   May 20 12:58:31 cib_rsc_callback(2113):0: Resource update 268 complete: rc=0
trace   May 20 12:58:31 cib_rsc_callback(2121):0: Triggering FSA: cib_rsc_callback
trace   May 20 12:58:31 cib_native_callback(666):0: OP callback activated for 268
trace   May 20 12:58:31 crm_ipc_read(992):0: No message from cib_shm received: Resource temporarily unavailable
trace   May 20 12:58:31 mainloop_gio_callback(654):0: Message acquisition from cib_shm[0x23b7ab0] failed: No message of desired type (-42)
trace   May 20 12:58:31 crm_fsa_trigger(293):0: Invoked (queue len: 0)
trace   May 20 12:58:31 s_crmd_fsa(159):0: FSA invoked with Cause: C_FSA_INTERNAL       State: S_NOT_DC
trace   May 20 12:58:31 s_crmd_fsa(246):0: Exiting the FSA
trace   May 20 12:58:31 crm_fsa_trigger(295):0: Exited  (queue len: 0)
notice  May 20 12:58:43 crm_signal_dispatch(272):0: Invoking handler for signal 5: Trace/breakpoint trap
notice  May 20 12:58:43 crm_write_blackbox(431):0: Blackbox dump requested, please see /var/lib/pacemaker/blackbox/crmd-2877.2 for contents

--
Mit freundlichen Grüßen
Dipl. Inf. (FH) Felix Zachlod

Onesty Tech GmbH
Lieberoser Str. 7
03046 Cottbus

Tel.: +49 (355) 289430
Fax.: +49 (355) 28943100
fz at onesty-tech.de

Registergericht Amtsgericht Cottbus, HRB 7885 Geschäftsführer Romy Schötz, Thomas Menzel