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Try changing the following in nova.conf and restart the nova-scheduler:

scheduler_host_subset_size = 10
scheduler_max_attempts = 10

Cheers,
George

On Wed, Nov 30, 2016 at 9:56 AM, Massimo Sgaravatto <
massimo.sgaravatto at gmail.com> wrote:

> Hi all
>
> I have a problem with scheduling in our Mitaka Cloud,
> Basically when there are a lot of requests for new instances, some of them
> fail because "Failed to compute_task_build_instances: Exceeded maximum
> number of retries". And the failures are because "Insufficient compute
> resources: Free memory 2879.50 MB < requested
>  8192 MB" [*]
>
> But there are compute nodes with enough memory that could serve such
> requests.
>
> In the conductor log I also see messages reporting that "Function
> 'nova.servicegroup.drivers.db.DbDriver._report_state' run outlasted
> interval by xxx sec" [**]
>
>
> My understanding is that:
>
> - VM a is scheduled to a certain compute node
> - the scheduler chooses the same compute node for VM b before the info for
> that compute node is updated (so the 'size' of VM a is not taken into
> account)
>
> Does this make sense or am I totally wrong ?
>
> Any hints about how to cope with such scenarios, besides increasing
>  scheduler_max_attempts ?
>
> scheduler_default_filters is set to:
>
> scheduler_default_filters = AggregateInstanceExtraSpecsFilter,
> AggregateMultiTenancyIsolation,RetryFilter,AvailabilityZoneFilter,
> RamFilter,CoreFilter,AggregateRamFilter,AggregateCoreFilter,ComputeFilter,
> ComputeCapabilitiesFilter,ImagePropertiesFilter,
> ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter
>
>
> Thanks a lot, Massimo
>
> [*]
>
> 2016-11-30 15:10:20.233 25140 WARNING nova.scheduler.utils
> [req-ec8c0bdc-b413-4cab-b925-eb8f11212049 840c96b6fb1e4972beaa3d30ade10cc7
> d27fe2becea94a3e980fb9f66e2f29
> 1a - - -] Failed to compute_task_build_instances: Exceeded maximum number
> of retries. Exceeded max scheduling attempts 5 for instance
> 314eccd0-fc73-446f-8138-7d8d3c
> 8644f7. Last exception: Insufficient compute resources: Free memory
> 2879.50 MB < requested 8192 MB.
> 2016-11-30 15:10:20.233 25140 WARNING nova.scheduler.utils
> [req-ec8c0bdc-b413-4cab-b925-eb8f11212049 840c96b6fb1e4972beaa3d30ade10cc7
> d27fe2becea94a3e980fb9f66e2f29
> 1a - - -] [instance: 314eccd0-fc73-446f-8138-7d8d3c8644f7] Setting
> instance to ERROR state.
>
>
> [**]
>
> 2016-11-30 15:10:48.873 25128 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 9.08 sec
> 2016-11-30 15:10:54.372 25142 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 9.33 sec
> 2016-11-30 15:10:54.375 25140 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 9.32 sec
> 2016-11-30 15:10:54.376 25129 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 9.30 sec
> 2016-11-30 15:10:54.381 25138 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 9.24 sec
> 2016-11-30 15:10:54.381 25139 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 9.28 sec
> 2016-11-30 15:10:54.382 25143 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 9.24 sec
> 2016-11-30 15:10:54.385 25141 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 9.11 sec
> 2016-11-30 15:11:01.964 25128 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 3.09 sec
> 2016-11-30 15:11:05.503 25142 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 1.13 sec
> 2016-11-30 15:11:05.506 25138 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 1.12 sec
> 2016-11-30 15:11:05.509 25139 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 1.13 sec
> 2016-11-30 15:11:05.512 25141 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 1.13 sec
> 2016-11-30 15:11:05.525 25143 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 1.14 sec
> 2016-11-30 15:11:05.526 25140 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 1.15 sec
> 2016-11-30 15:11:05.529 25129 WARNING oslo.service.loopingcall [-]
> Function 'nova.servicegroup.drivers.db.DbDriver._report_state' run
> outlasted interval by 1.15 sec
>
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