core: change score calculator in few disk space to avoid offline earlier (#3592) #3605
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## release-5.0 #3605 +/- ##
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- Coverage 74.60% 74.60% -0.01%
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Files 245 245
Lines 24122 24124 +2
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- Misses 4510 4515 +5
+ Partials 1615 1612 -3
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cherry-pick #3592 to release-5.0
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# In pd repo: git pr https://github.com/tikv/pd/pull/3605After apply modifications, you can push your change to this PR via:
What problem does this PR solve?
issue: #3589
What is changed and how it works?
core regionScoreV2 calculator, store's score will increase rapidly when it disk space less than F
Check List
Tests
Code changes
when I use math to consider score similator in low space：
the score will be mostly affect by C, so their socres is different,the lower disk has few score than higher disk. so it will move region to lower store to run out of disk :
similator ：
What is changed and how it works?
core regionScoreV2 calculator, store's score will increase rapidly when it disk space less than F.
the F param is not 20G, it should be set by the store's disk space , F will be set:
F=max(50,capacity*(1-lowSpaceRatio))
I want to the score should be similar when they has same free space in low disk space, so use linear calculator.
similator result：
test result：
it work well in low space
Side effects
Related changes
Release note