[Pacemaker] Need help with resolving very long election cycle

Andreas Kurz andreas at hastexo.com
Thu Feb 2 05:08:04 EST 2012 

On 02/02/2012 04:45 AM, Shyam wrote:
> Hi Andreas,
> 
> Thanks for your reply.
> 
> We are using pacemaker in VM environment & was primarily checking how it
> behaves when two nodes hosting the clustered VM's reboot. It apparently
> took a very long time doing the elections.

Ok, but this is only for testing? For a production system the VMs
running a cluster should not run on the same host as this would be a SPOF.

> 
> I realized that we were using dc-deadtime at 5sec. After bumping this up
> to 10sec, this long election cycle problem disappeared.

... interesting

Regards,
Andreas

-- 
Need help with Pacemaker?
http://www.hastexo.com/now

> 
> --Shyam
> 
> On Thu, Feb 2, 2012 at 3:59 AM, Andreas Kurz <andreas at hastexo.com
> <mailto:andreas at hastexo.com>> wrote:
> 
>     On 01/27/2012 12:21 PM, Shyam wrote:
>     > Folks,
>     >
>     > We are constantly running into a long election cycle where in a 2-node
>     > cluster when both of them are simultaneously rebooted, they take a
>     long
>     > time running through election loop.
> 
>     why do you want to reboot them simultaneously? ... stop them one after
>     another and this will work fine.
> 
>     If you want to avoid time consuming resource movement use cluster
>     property stop-all-resources prior to the serialized shutdown.
> 
>     Regards,
>     Andreas
> 
>     --
>     Need help with Pacemaker?
>     http://www.hastexo.com/now
> 
>     >
>     > On one node pacemaker loops like:
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 crmd: [1134]: info: do_dc_takeover:
>     > Taking over DC status for this partition
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_readwrite: We are now in R/O mode
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_slave_all for section
>     > 'all' (origin=local/crmd/222, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_readwrite: We are now in R/W mode
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_master for section
>     'all'
>     > (origin=local/crmd/223, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_modify for section cib
>     > (origin=local/crmd/224, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_modify for section
>     > crm_config (origin=local/crmd/226, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_dc_join_offer_all: join-25: Waiting on 2 outstanding join acks
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_modify for section
>     > crm_config (origin=local/crmd/228, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > config_query_callback: Checking for expired actions every 900000ms
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_election_count_vote: Election 50 (owner:
>     > 00000156-0156-0000-2b91-000000000000) pass: vote from
>     vsa-0000009c-vc-0
>     > (Age)
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 crmd: [1134]: info: update_dc:
>     Set DC
>     > to vsa-0000009c-vc-1 (3.0.1)
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_state_transition: State transition S_INTEGRATION -> S_ELECTION [
>     > input=I_ELECTION cause=C_FSA_INTERNAL origin=do_election_count_vote ]
>     > Jan 26 22:03:20 vsa-0000009c-vc-1 crmd: [1134]: info: update_dc: Unset
>     > DC vsa-0000009c-vc-1
>     > Jan 26 22:03:21 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_election_count_vote: Election 51 (owner:
>     > 00000156-0156-0000-2b91-000000000000) pass: vote from
>     vsa-0000009c-vc-0
>     > (Age)
>     > Jan 26 22:03:21 vsa-0000009c-vc-1 crmd: [1134]: WARN: do_log: FSA:
>     Input
>     > I_JOIN_REQUEST from route_message() received in state S_ELECTION
>     > Jan 26 22:03:22 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_state_transition: State transition S_ELECTION -> S_INTEGRATION [
>     > input=I_ELECTION_DC cause=C_FSA_INTERNAL origin=do_election_check ]
>     > Jan 26 22:03:22 vsa-0000009c-vc-1 crmd: [1134]: info: start_subsystem:
>     > Starting sub-system "pengine"
>     > Jan 26 22:03:22 vsa-0000009c-vc-1 crmd: [1134]: WARN: start_subsystem:
>     > Client pengine already running as pid 1234
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 crmd: [1134]: info: do_dc_takeover:
>     > Taking over DC status for this partition
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_readwrite: We are now in R/O mode
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_slave_all for section
>     > 'all' (origin=local/crmd/231, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_readwrite: We are now in R/W mode
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_master for section
>     'all'
>     > (origin=local/crmd/232, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_modify for section cib
>     > (origin=local/crmd/233, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_modify for section
>     > crm_config (origin=local/crmd/235, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_dc_join_offer_all: join-26: Waiting on 2 outstanding join acks
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 cib: [1130]: info:
>     > cib_process_request: Operation complete: op cib_modify for section
>     > crm_config (origin=local/crmd/237, version=1.1.1): ok (rc=0)
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > config_query_callback: Checking for expired actions every 900000ms
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_election_count_vote: Election 52 (owner:
>     > 00000156-0156-0000-2b91-000000000000) pass: vote from
>     vsa-0000009c-vc-0
>     > (Age)
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 crmd: [1134]: info: update_dc:
>     Set DC
>     > to vsa-0000009c-vc-1 (3.0.1)
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_state_transition: State transition S_INTEGRATION -> S_ELECTION [
>     > input=I_ELECTION cause=C_FSA_INTERNAL origin=do_election_count_vote ]
>     > Jan 26 22:03:26 vsa-0000009c-vc-1 crmd: [1134]: info: update_dc: Unset
>     > DC vsa-0000009c-vc-1
>     > Jan 26 22:03:27 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_election_count_vote: Election 53 (owner:
>     > 00000156-0156-0000-2b91-000000000000) pass: vote from
>     vsa-0000009c-vc-0
>     > (Age)
>     > Jan 26 22:03:27 vsa-0000009c-vc-1 crmd: [1134]: WARN: do_log: FSA:
>     Input
>     > I_JOIN_REQUEST from route_message() received in state S_ELECTION
>     > Jan 26 22:03:28 vsa-0000009c-vc-1 crmd: [1134]: info:
>     > do_state_transition: State transition S_ELECTION -> S_INTEGRATION [
>     > input=I_ELECTION_DC cause=C_FSA_INTERNAL origin=do_election_check ]
>     > Jan 26 22:03:28 vsa-0000009c-vc-1 crmd: [1134]: info: start_subsystem:
>     > Starting sub-system "pengine"
>     > Jan 26 22:03:28 vsa-0000009c-vc-1 crmd: [1134]: WARN: start_subsystem:
>     > Client pengine already running as pid 1234
>     >
>     > &  other node with
>     > Jan 26 22:03:20 vsa-0000009c-vc-0 crmd: [1314]: info:
>     crm_timer_popped:
>     > Election Trigger (I_DC_TIMEOUT) just popped!
>     > Jan 26 22:03:20 vsa-0000009c-vc-0 crmd: [1314]: WARN: do_log: FSA:
>     Input
>     > I_DC_TIMEOUT from crm_timer_popped() received in state S_PENDING
>     > Jan 26 22:03:20 vsa-0000009c-vc-0 crmd: [1314]: info:
>     > do_state_transition: State transition S_PENDING -> S_ELECTION [
>     > input=I_DC_TIMEOUT cause=C_TIMER_POPPED origin=crm_timer_popped ]
>     > Jan 26 22:03:21 vsa-0000009c-vc-0 crmd: [1314]: WARN: do_log: FSA:
>     Input
>     > I_JOIN_OFFER from route_message() received in state S_ELECTION
>     > Jan 26 22:03:21 vsa-0000009c-vc-0 crmd: [1314]: info:
>     > do_state_transition: State transition S_ELECTION -> S_PENDING [
>     > input=I_PENDING cause=C_FSA_INTERNAL origin=do_election_count_vote ]
>     > Jan 26 22:03:21 vsa-0000009c-vc-0 crmd: [1314]: info:
>     do_dc_release: DC
>     > role released
>     > Jan 26 22:03:21 vsa-0000009c-vc-0 crmd: [1314]: info: do_te_control:
>     > Transitioner is now inactive
>     > Jan 26 22:03:26 vsa-0000009c-vc-0 crmd: [1314]: info:
>     crm_timer_popped:
>     > Election Trigger (I_DC_TIMEOUT) just popped!
>     > Jan 26 22:03:26 vsa-0000009c-vc-0 crmd: [1314]: WARN: do_log: FSA:
>     Input
>     > I_DC_TIMEOUT from crm_timer_popped() received in state S_PENDING
>     > Jan 26 22:03:26 vsa-0000009c-vc-0 crmd: [1314]: info:
>     > do_state_transition: State transition S_PENDING -> S_ELECTION [
>     > input=I_DC_TIMEOUT cause=C_TIMER_POPPED origin=crm_timer_popped ]
>     > Jan 26 22:03:27 vsa-0000009c-vc-0 crmd: [1314]: WARN: do_log: FSA:
>     Input
>     > I_JOIN_OFFER from route_message() received in state S_ELECTION
>     > Jan 26 22:03:27 vsa-0000009c-vc-0 crmd: [1314]: info:
>     > do_state_transition: State transition S_ELECTION -> S_PENDING [
>     > input=I_PENDING cause=C_FSA_INTERNAL origin=do_election_count_vote ]
>     > Jan 26 22:03:27 vsa-0000009c-vc-0 crmd: [1314]: info:
>     do_dc_release: DC
>     > role released
>     > Jan 26 22:03:27 vsa-0000009c-vc-0 crmd: [1314]: info: do_te_control:
>     > Transitioner is now inactive
>     >
>     > This takes several minutes & finally breaks.
>     >
>     > Any pointers on what can be causing this?
>     >
>     > Thanks.
>     >
>     > --Shyam
>     >
>     >
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> 
> 
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> 
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