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pybind/mgr/balancer: allow customized optimization threshold

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In practice it is hard to achieve a 100% (perfect) balanced distribution.
This patch introduces a user visiable threshold configuration here, which
allow user to define the minimal deviation to trigger an optimization.

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>
This commit is contained in:
xie xingguo 2018-02-02 15:12:49 +08:00
parent 3733b94686
commit 147625651f
1 changed files with 7 additions and 2 deletions
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9
src/pybind/mgr/balancer/module.py
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@ -697,8 +697,13 @@ class Module(MgrModule):
osdmap = ms.osdmap
crush = osdmap.get_crush()
pe = self.calc_eval(ms, plan.pools)
if pe.score == 0:
detail = 'Distribution is already perfect'
min_score_to_optimize = float(self.get_config('min_score', 0))
if pe.score <= min_score_to_optimize:
if pe.score == 0:
detail = 'Distribution is already perfect'
else:
detail = 'score %f <= min_score %f, will not optimize' \
% (pe.score, min_score_to_optimize)
self.log.info(detail)
return -errno.EALREADY, detail