mon_command

mon_command

[David Zafman]

My understanding is that are going to be using rados_mon_command() to create pools according to Tracker #7586: deprecate rados_pool_create.  What I found when building a test case for EC is that after using the mon_command to create the pool I need to use wait_for_latest_osdmap() in order to wait for the change to propagate.  The replicated pool test case using pool_create() doesn’t need to wait_for_latest_osdmap().

Should we be deprecating librados calls in favor of the very generic mon_command() interface?  I would suggest that we add the appropriate librados features to manipulate erasure coded pools.

David Zafman
Senior Developer
http://www.inktank.com

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Re: mon_command

[Loic Dachary]

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Hi David,


On 20/03/2014 03:40, David Zafman wrote:> 
> My understanding is that are going to be using rados_mon_command() to create pools according to Tracker #7586: deprecate rados_pool_create.  What I found when building a test case for EC is that after using the mon_command to create the pool I need to use wait_for_latest_osdmap() in order to wait for the change to propagate.  The replicated pool test case using pool_create() doesn’t need to wait_for_latest_osdmap().
> 
> Should we be deprecating librados calls in favor of the very generic mon_command() interface?  

> I would suggest that we add the appropriate librados features to manipulate erasure coded pools.

What do you have in mind ? There are osd erasure-code-profile, osd crush rule create-erasure and the additional arguments to osd pool create can be used with rados_mon_command (or mon_command with the suggested implicit wait_for_latest_osdmap ). Anything else ?

https://github.com/ceph/ceph/blob/master/doc/dev/erasure-coded-pool.rst

Cheers

> 
> David Zafman
> Senior Developer
> http://www.inktank.com
> 
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-- 
Loïc Dachary, Artisan Logiciel Libre


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