Re: mgr balancer module

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Sage

I think it would be a good idea to include a command in the balancer
module itself, that would optimize the crushmap using the
python-crush, and set the optimized crushmap.

As far as I believe, uneven distributions can be majorly attributed to
the factors:
* using an unoptimized crushmap
* unevenness that occurs due to the (pseudo) random nature of CRUSH
* objects having different sizes.

If we set an optimized crushmap, at the very initial stages, we have
to move very less data in the due course, in order to maintain a
proper distribution. Hence the necessity of including it in the
balancer module. Please give a look at the PR[1], I sent in this
regard, and let me know if I am moving in the right direction.

[1] : https://github.com/liewegas/ceph/pull/57

-- 
Regards
Spandan Kumar Sahu
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