On 08/12/2013 03:28 PM, Yair Zaslavsky wrote:
----- Original Message -----
From: "Sahina Bose" <sabose@redhat.com> To: "Eli Mesika" <emesika@redhat.com> Cc: "engine-devel" <engine-devel@ovirt.org>, arch@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" <sabose@redhat.com> To: "engine-devel" <engine-devel@ovirt.org>, arch@ovirt.org, "Michael Pasternak" <mpastern@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_Man....
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#R...) 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 _______________________________________________ Engine-devel mailing list Engine-devel@ovirt.org http://lists.ovirt.org/mailman/listinfo/engine-devel
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