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From Alex Huang <Alex.Hu...@citrix.com>
Subject RE: A question on vm migrations when hosts are set into a maintenance mode.
Date Thu, 21 Nov 2013 15:22:14 GMT
It's because we switched over to a new way to declare configuration variables.  Here's some
information about it.

https://cwiki.apache.org/confluence/display/CLOUDSTACK/Configuration

--Alex

From: Alex Ough [mailto:alex.ough@sungard.com]
Sent: Wednesday, November 20, 2013 9:56 AM
To: Alex Huang
Cc: dev@cloudstack.apache.org
Subject: Re: A question on vm migrations when hosts are set into a maintenance mode.

Hi Alex,

It looks like you moved the 'ExecuteInSequence' to the vm level from the management server,
which seems to be ok, but at this time I cannot test it
because when I try to start up the management server, it fails because of database schema
error, which is 'Unknown column 'disk_offering.cache_mode' in 'field list' even if I re-built
the database.

Is the schema change part of your changes or something other developer changed?

If that is from any other developer, can you fix this?

Thanks
Alex Ough



On Tue, Nov 19, 2013 at 7:25 PM, Alex Huang <Alex.Huang@citrix.com<mailto:Alex.Huang@citrix.com>>
wrote:
Alex,

Can you do a pull from master and see if my fix fits your needs.  Unfortunately, I'm on the
road and couldn't do an actual test of it.

--Alex

From: Alex Huang
Sent: Tuesday, November 19, 2013 4:45 AM
To: 'Alex Ough'; dev@cloudstack.apache.org<mailto:dev@cloudstack.apache.org>
Subject: RE: A question on vm migrations when hosts are set into a maintenance mode.

Alex,

Sorry for the late reply.  Been travelling the last couple of weeks.  I'll look into this
today.

--Alex

From: Alex Ough [mailto:alex.ough@sungard.com]
Sent: Monday, November 18, 2013 6:17 AM
To: dev@cloudstack.apache.org<mailto:dev@cloudstack.apache.org>
Cc: Alex Huang
Subject: Re: A question on vm migrations when hosts are set into a maintenance mode.

Thank Parasanna & Sebastien,
I also got his email and sent an email.
Waiting for his reply...

Thanks
Alex Ough

On Sat, Nov 16, 2013 at 3:05 PM, Sebastien Goasguen <runseb@gmail.com<mailto:runseb@gmail.com>>
wrote:
cc Alex Huang to get his attention:


On Nov 15, 2013, at 10:17 PM, Prasanna Santhanam <tsp@apache.org<mailto:tsp@apache.org>>
wrote:

> Alex, Could you just do a git blame on the file and copy the emails of
> people who changed that bit of code? They may be able to help if Cc-ed
> directly.
>
> Thanks,
>
> On Fri, Nov 15, 2013 at 01:49:07PM -0600, Alex Ough wrote:
>> I hate to sending the same emails over and over again, but I really need to
>> finalize this feature to be included in the next code freeze because this
>> feature is very critical in our inside project.
>>
>> Anyone who can help, please?
>> Thanks
>> Alex Ough
>>
>>
>> On Thu, Nov 14, 2013 at 1:27 PM, Alex Ough <alex.ough@sungard.com<mailto:alex.ough@sungard.com>>
wrote:
>>
>>> Not sure if Alex Huang checked this, but can anyone help to resolve this?
>>>
>>> Thanks
>>> Alex Ough
>>>
>>>
>>> On Wed, Nov 13, 2013 at 11:39 AM, Alex Ough <alex.ough@sungard.com<mailto:alex.ough@sungard.com>>
wrote:
>>>
>>>> It sounds a little scary...
>>>>
>>>> I looked at the history and found these.
>>>>
>>>> 8/9/ : file moved to engine by Alex Huang
>>>> 9/16 : '_mgmtServer.getExecuteInSequence()' changed to
>>>> 'getExecuteInSequence()' by Alex Huang
>>>>
>>>>
>>>> Hi Alex Huang,
>>>> I'm not sure if you're aware of this, but can you check this for me?
>>>>
>>>> Thanks
>>>> Alex Ough
>>>>
>>>>
>>>>
>>>> On Wed, Nov 13, 2013 at 11:18 AM, Marcus Sorensen <shadowsor@gmail.com<mailto:shadowsor@gmail.com>>wrote:
>>>>
>>>>> I'm not sure. I know in the past when I've seen files change locations
>>>>> it has also clobbered updates to that file. Someone branched, did the
>>>>> reorganization work, and merged, while in-between the original file
>>>>> changed.
>>>>>
>>>>> On Wed, Nov 13, 2013 at 9:21 AM, Alex Ough <alex.ough@sungard.com<mailto:alex.ough@sungard.com>>
>>>>> wrote:
>>>>>> All,
>>>>>>
>>>>>> While merging my changes to 4.3 branch, I found that the option,
>>>>>> 'execute.in.sequence.hypervisor.commands' is NOT used in
>>>>> Start/Stop/Copy
>>>>>> commands in 'VirtualMachineManagerImpl.java' any more as below.
>>>>>>
>>>>>>
>>>>>> *StopCommand stop = new StopCommand(vm, getExecuteInSequence());*
>>>>>>
>>>>>> *protected boolean getExecuteInSequence() {*
>>>>>> *     return false;*
>>>>>> *}*
>>>>>>
>>>>>> As you see in the above, the function, 'getExecuteInSequence', just
>>>>> returns
>>>>>> false instead of getting the value from the global variable.
>>>>>>
>>>>>> And one more change is that the file has been moved to
>>>>>> 'engine/orchestration/src/com/cloud/vm' from 'server/src/com/cloud/vm'.
>>>>>>
>>>>>> Am I missing something related with this or do we stop supporting
this
>>>>>> option in 4.3?
>>>>>> I'm a little confused, so please help me resolve this.
>>>>>>
>>>>>> Thanks
>>>>>> Alex Ough
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Tue, Nov 12, 2013 at 4:20 PM, Alex Ough <alex.ough@sungard.com<mailto:alex.ough@sungard.com>>
>>>>> wrote:
>>>>>>
>>>>>>> Thanks a lot for your confirmation, Marcus.
>>>>>>> I'll create a review request unless anyone has an objection.
>>>>>>>
>>>>>>> Thanks
>>>>>>> Alex Ough
>>>>>>>
>>>>>>>
>>>>>>> On Tue, Nov 12, 2013 at 3:37 PM, Marcus Sorensen <shadowsor@gmail.com<mailto:shadowsor@gmail.com>
>>>>>> wrote:
>>>>>>>
>>>>>>>> I have done parallel KVM migrations without issue, it's "supposed
to
>>>>>>>> work". Really I think it's in the same boat as parallel start/stop.
>>>>> It
>>>>>>>> should work, but the config option is there just in case.
I think we
>>>>>>>> should add it.
>>>>>>>>
>>>>>>>> On Thu, Oct 3, 2013 at 11:41 AM, Chip Childers
>>>>>>>> <chip.childers@sungard.com<mailto:chip.childers@sungard.com>>
wrote:
>>>>>>>>> On Thu, Oct 03, 2013 at 11:44:46AM -0500, Alex Ough wrote:
>>>>>>>>>> I'm not sure what else commands 'MigrateCommand'
actually execute
>>>>> in
>>>>>>>>>> addition to 'Start/Stop/CopyCommand', but can we
include
>>>>>>>> 'MigrateCommand'
>>>>>>>>>> if it consists of only those 3 commands?
>>>>>>>>>>
>>>>>>>>>> Thanks
>>>>>>>>>> Alex Ough
>>>>>>>>>
>>>>>>>>> In the case of VMware, the migrate command is executed
via the
>>>>>>>>> MigrateVMTask that's part of the VMware SDK (see
>>>>>>>>>
>>>>> vmware-base/src/com/cloud/hypervisor/vmware/mo/VirtualMachineMO.java).
>>>>>>>>>
>>>>>>>>> For VMware, I know that vCenter will queue and process
concurrent
>>>>>>>>> requests for migrations.  Specifically, it will throttle
the
>>>>> migrations
>>>>>>>>> happening, based on it's internal concurrency constraints,
but the
>>>>> task
>>>>>>>>> queue will still accept more connections.  Obviously
the risk are
>>>>> the
>>>>>>>>> VMware layer tasks timing out if it takes too long for
the task
>>>>> queue to
>>>>>>>>> complete.
>>>>>>>>>
>>>>>>>>> As for XenServer, it's happening in what appears to be
a similar
>>>>> way
>>>>>>>>> (although the source host is the target for the migration
API
>>>>> call).
>>>>>>>>>
>>>>>>>>> Check
>>>>>>>>>
>>>>>>>>
>>>>> plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java.
>>>>>>>>>
>>>>>>>>> I'm not familiar enough with XenServer's concurrency
model for
>>>>>>>>> migrations.  Any experts know the answer to if it can
handle
>>>>> concurrency
>>>>>>>>> in a stable way?
>>>>>>>>>
>>>>>>>>> With KVM, it's obviously executing via the agent.  Similarly
to
>>>>>>>>> XenServer, I'm not familiar enough to know about concurrent
>>>>> operations.
>>>>>>>>>
>>>>>>>>> So do the HV experts on the list have any opinions about
XenServer
>>>>> and
>>>>>>>>> KVM migration concurrency?
>>>>>>>>>
>>>>>>>>> -chip
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>
>>>>>
>>>>
>>>
>
> --
> Prasanna.,
>
> ------------------------
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