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83 lines
2.4 KiB
83 lines
2.4 KiB
require "./spec_helper"
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describe Crystal::Scatter do
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it "add elements to RingGraphs" do
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rg = Crystal::Scatter::RingGraph.new 0
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rg.add(UInt64.new(1),[0,0,0,0,0,0],"OSD0")
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rg.add(UInt64.new(1),[0,0,0,0,0,1],"OSD1")
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rg.add(UInt64.new(1),[0,0,0,0,1,0],"OSD2")
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rg.get_weight.should eq(3)
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rg.generate_ring(BigRational.new(1))
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rg.first.first.first.first.first.first.range_effector.not_nil!.[0].should eq(0)
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rg.last.last.last.last.last.last.range_effector.not_nil!.[1].should eq(UInt64::MAX)
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end
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it "slices data into multiple pods" do
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mr = Crystal::Scatter::MetaRing.new(3)
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mr.add Crystal::Scatter::Daemon.new(1,[0,0,0,0,0,0],"OSD0")
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mr.add [Crystal::Scatter::Daemon.new(1,[0,0,0,0,0,1],"OSD1"),Crystal::Scatter::Daemon.new(1,[0,0,0,0,0,2],"OSD2")]
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(1..1000).each do |numb|
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slices = mr.get_slices_for(numb.to_s)
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slices_history = mr.get_slices_for(numb.to_s,2)
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set = Set(String).new
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slices.each do |sl|
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set<<sl.url
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end
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slices_history.slices.size.should eq(2)
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set.size.should eq(3)
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end
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end
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it "hashes data fast" do
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v = Crystal::Scatter::MetaRing.new(3)
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time = Time.now
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(1..100).each do |numb|
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v.hash(numb.to_s)
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end
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t = (Time.now - time)
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(t.milliseconds <= 1).should be_true
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end
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it "hashes data good" do
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v = Crystal::Scatter::MetaRing.new(3)
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hash_nb =1000000
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store = Hash(UInt64, Int32).new
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(1..hash_nb).each do |numb|
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h = v.hash(numb.to_s)
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nb=store.fetch(h,0)
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store[h]=nb+1
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end
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conflicts = hash_nb-store.size
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(conflicts <= 100).should be_true
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mod_array = Array(Int32).new(1000,0)
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slice_array = Array(Int32).new(1000,0)
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store.each_key do |key|
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key_mod = key%1000
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mod_array[key_mod]+=1
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key_slice = key/(UInt64::MAX/1000)
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slice_array[key_slice]+=1
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end
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good_mod = true
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good_slice = true
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mod_array.each do |v|
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good_mod&=(v > (hash_nb/1000*4/5))
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end
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slice_array.each do |v|
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good_slice&=(v > (hash_nb/1000*4/5))
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end
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good_mod.should be_true
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good_slice.should be_true
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end
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end
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