Open Stack

Hi Hua,

I have some comments about this:

A>
 remove heat poller can be a way, but some of its logic needs to make sure
it work and performance not burden.
1) for old heat poller it is quick loop, with fixed interval, to make sure
stack status update quickly can be reflected in bay status
2) for periodic task running, it seems dynamic loop, and period is long, it
was added for some stacks creation timeout, 1) loop exit, this 2) loop can
help update the stack and also conductor crash issue


It would be ideal to put in one place for looping over the stacks, but
periodic tasks need to consider if it really just need to loop
IN_PROGRESS status stack ? And what's the interval for loop that ? (60s or
short, loop performance)

Does heat have other status transition  path, like delete_failed -->
(status reset) --> become OK.  etc.



B> For remove db operation in bay_update case. I did not understand your
suggestion.
bay_update include update_stack and poll_and_check(it is in heat poller),
if you removed heat poller to periodic task(as you said in your 3). It
still needs db operations.



C> For allow admin user to show stacks in other tenant, it seems OK. Does
other projects try this before? Is it reasonable case for customer ?



Thanks


Best Wishes,
--------------------------------------------------------------------------------
Kai Qiang Wu (吴开强  Kennan）
IBM China System and Technology Lab, Beijing

E-mail: wkqwu at cn.ibm.com
Tel: 86-10-82451647
Address: Building 28(Ring Building), ZhongGuanCun Software Park,
         No.8 Dong Bei Wang West Road, Haidian District Beijing P.R.China
100193
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Follow your heart. You are miracle!



From:	王华 <wanghua.humble at gmail.com>
To:	openstack-dev at lists.openstack.org
Date:	08/13/2015 11:31 AM
Subject:	Re: [openstack-dev] [magnum]problems for horizontal scale



any comments on this?

On Wed, Aug 12, 2015 at 2:50 PM, 王华 <wanghua.humble at gmail.com> wrote:
  Hi All,

  In order to prevent race conditions due to multiple conductors, my
  solution is as blew:
  1. remove the db operation in bay_update to prevent race conditions.Stack
  operation is atomic. Db operation is atomic. But the two operations
  together are not atomic.So the data in the db may be wrong.
  2. sync up stack status and stack parameters(now only node_count) from
  heat by periodic tasks. bay_update can change stack parameters, so we
  need to sync up them.
  3. remove heat poller, because we have periodic tasks.

  To sync up stack parameters from heat, we need to show stacks using
  admin_context. But heat don't allow to show stacks in other tenant. If we
  want to show stacks in other tenant, we need to store auth context for
  every bay. That is a problem. Even if we store the auth context, there is
  a timeout for token. The best way I think is to let heat allow admin user
  to show stacks in other tenant.

  Do you have a better solution or any improvement for my solution?

  Regards,
  Wanghua
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