[Pacemaker] RA Supporting the reload action

[David Vossel]

----- Original Message -----
> From: "Felix Zachlod" <fz.lists at sis-gmbh.info>
> To: "The Pacemaker cluster resource manager" <pacemaker at oss.clusterlabs.org>
> Sent: Thursday, April 11, 2013 8:47:50 AM
> Subject: [Pacemaker] RA Supporting the reload action
> 
> Hello gain folks,
> 
> I have been implementing a reload action for a resource agent. The action is
> advertised in the meta-data and it works when invoking it directly.
> According to http://linux-ha.org/wiki/OCF_Resource_Agents and
> http://clusterlabs.org/doc/en-US/Pacemaker/1.0/html/Pacemaker_Explained/s-re
> load.html I assumed that the crm should trigger reload after a modification
> of the resource params.
> 
> "reload - reload the configuration (non-unique parameters only) of the
> resource instance without disrupting the service"
> 
> But after modifying a non-unique param the pacemaker decided to restart my
> resource.
> 
> Apr 11 15:31:01 storage-test-a crmd: [7177]: info: te_rsc_command:
> Initiating action 58: stop p_lun_vmfs_test_stop_0 on storage-test-b
> Apr 11 15:31:01 storage-test-a attrd: [7176]: notice: attrd_trigger_update:
> Sending flush op to all hosts for: last-failure-p_drbd0:0 (1365582777)
> Apr 11 15:31:01 storage-test-a pengine: [7563]: notice: process_pe_message:
> Transition 300: PEngine Input stored in: /var/lib/pengine/pe-input-285.bz2
> Apr 11 15:31:01 storage-test-a attrd: [7176]: notice: attrd_trigger_update:
> Sending flush op to all hosts for: probe_complete (true)
> Apr 11 15:31:02 storage-test-a crmd: [7177]: info: te_rsc_command:
> Initiating action 2: start p_lun_vmfs_test_start_0 on storage-test-b
> 
> Is there anything I am missing about the reload thing?

Can you paste your agent's metadata in here or in pastebin so we can take a look?

Pacemaker actually reads the agent's metadata to know if the reload option is possible.  It then checks to see if the parameters that changed where marked as unique or not in the agent's metadata before deciding if a reload is possible instead of a restart.

-- Vossel

> 
> Will the crm use reload even in case there are order constraints for other
> resources that depend on this RA?
> 
> Thank you all
> 
> Regards, Felix
> 
> 
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