2016-08-15 22:21:22 +08:00
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# hashring
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2016-08-15 22:52:09 +08:00
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A golang consistent hashring
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Install
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===
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go get github.com/g4zhuj/hashring
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Usage
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===
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```
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// virtualSpots means virtual spots created by each node
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2018-04-09 11:34:07 +08:00
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nodeWeight := make(map[string]int)
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nodeWeight["node1"] = 1
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nodeWeight["node2"] = 1
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nodeWeight["node3"] = 2
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vitualSpots := 100
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hash := NewHashRing(virtualSpots)
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2016-08-15 22:52:09 +08:00
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2018-04-09 11:34:07 +08:00
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//add nodes
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hash.AddNodes(nodeWeight)
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2016-08-15 22:52:09 +08:00
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2018-04-09 11:34:07 +08:00
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//remove node
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hash.RemoveNode("node3")
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2016-08-15 22:52:09 +08:00
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2018-04-09 11:34:07 +08:00
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//add node
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hash.AddNode("node3", 3)
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2016-08-15 22:52:09 +08:00
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2018-04-09 11:34:07 +08:00
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//get key's node
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node := hash.GetNode("key")
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2016-08-15 22:52:09 +08:00
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2020-02-15 22:26:47 +08:00
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```
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坑点：
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// 一个9064767行的文件 每行做hashring，结果不一致 原因hashBytes只取4位 529和83 一致 ，这个库是一对多的关系，非多对一
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// node=1000 vitualSpots=20000
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//9063340 key=49f57cf0 node=529
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//9063340 key=49f57cf0 node=83
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