[Engine-devel] Gluster Volume asynchronous tasks

[Sahina Bose]

On 08/12/2013 01:21 PM, Eli Mesika wrote:
>
> ----- Original Message -----
>> From: "Sahina Bose" <sabose at redhat.com>
>> To: "engine-devel" <engine-devel at ovirt.org>, arch at ovirt.org, "Michael Pasternak" <mpastern at redhat.com>
>> Sent: Monday, August 12, 2013 8:41:55 AM
>> Subject: [Engine-devel] Gluster Volume asynchronous tasks
>>
>> Hi all,
>>
>> We are working on a feature to add support to start and monitor gluster
>> volume asynchronous tasks (like rebalancing a gluster volume, removing
>> brick from volume ) from the oVirt engine.
>>
>> The operations can be started from the Volumes tab or the Bricks sub-tab
>> using the Rebalance, Remove options.
>> These are long running operations which can be monitored using a task id
>> returned from Gluster. We are planning to add the monitoring in the
>> existing Task sub tab
>>
>> The feature description and User flows are at
>> http://www.ovirt.org/Features/Gluster_Volume_Asynchronous_Tasks_Management
>>
>> The detailed design (including REST API design) is at
>> http://www.ovirt.org/Features/Detailed_Gluster_Volume_Asynchronous_Tasks_Management.
>>
>> I would really appreciate if you could review and provide your valuable
>> feedback.
> I Sahina
> Why not using 6the External Tasks feature introduced for 3.3 for those Gluster tasks ???
> http://www.ovirt.org/Features/Design/DetailedExternalTasks
Hi Eli,

We still want to be able to start and stop these operations from the engine.
So, when a user wants to say, rebalance a volume, they would go select 
the volume and click on Rebalance Start.
This would then call the BLL command to start rebalance which will 
invoke the corresponding vdsm verb to start the rebalance on the volume.
This is the same as existing flow for other commands. The only 
difference is the vdsm verb will return the task id from gluster, for 
the rebalance operation that was started. And we will monitor the 
progress of the task using the gluster task id (by calling a gluster 
command)

I'm not sure how ExternalTasks would fit in here? I was thinking of 
using ExternalTask support for adding Job/Steps to engine when the 
operation is started outside of engine, that is, from Gluster CLI.
Please correct me if I'm missing something.


>
>
>
>> thanks
>> sahina
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