On 08/12/2013 03:28 PM, Yair Zaslavsky wrote:
----- Original Message -----
From: "Sahina Bose" <sab...@redhat.com>
To: "Eli Mesika" <emes...@redhat.com>
Cc: "engine-devel" <engine-devel@ovirt.org>, a...@ovirt.org
Sent: Monday, August 12, 2013 11:51:15 AM
Subject: Re: [Engine-devel] Gluster Volume asynchronous tasks
On 08/12/2013 01:21 PM, Eli Mesika wrote:
----- Original Message -----
From: "Sahina Bose" <sab...@redhat.com>
To: "engine-devel" <engine-devel@ovirt.org>, a...@ovirt.org, "Michael
Pasternak" <mpast...@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.
Does this mean that from Gluster CLI you will not try and invoke the rebalance
command ?
(I mean, I should either use Gluster CLI or Engine's REST API?)
Rebalance volume command could be invoked in any of the following ways:
1. From the console UI (clicking on Rebalance as shown in
http://www.ovirt.org/Features/Gluster_Volume_Asynchronous_Tasks_Management#Rebalance_Volume)
2. Using REST API
3. Outside of engine, from Gluster CLI - In such cases, the engine
should detect that a user has triggered rebalance operation outside the
engine, and allow the user to monitor progress of this from the engine.
This is where, we need support to add a Job for an operation that was
started externally, so that it can be seen in the Tasks tab.
thanks
sahina
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