Created
June 3, 2015 10:39
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Couchbase work out a set of keys that are guaranteed to write to all vBuckets
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// from github.com/go-couchbase | |
// Copyright (c) 2013 Couchbase, Inc. | |
// | |
package couchbase | |
import ( | |
"fmt" | |
"testing" | |
"unsafe" | |
) | |
func testBucket() Bucket { | |
b := Bucket{vBucketServerMap: unsafe.Pointer(&VBucketServerMap{ | |
VBucketMap: make([][]int, 2048), | |
})} | |
return b | |
} | |
/* | |
key: k0 master: 10.1.7.1:11210 vBucketId: 9 couchApiBase: http://10.1.7.1:8092/default replicas: 10.1.7.2:11210 | |
key: k1 master: 10.1.7.1:11210 vBucketId: 14 couchApiBase: http://10.1.7.1:8092/default replicas: 10.1.7.3:11210 | |
key: k2 master: 10.1.7.1:11210 vBucketId: 7 couchApiBase: http://10.1.7.1:8092/default replicas: 10.1.7.2:11210 | |
key: k3 master: 10.1.7.1:11210 vBucketId: 0 couchApiBase: http://10.1.7.1:8092/default replicas: 10.1.7.2:11210 | |
key: k4 master: 10.1.7.2:11210 vBucketId: 100 couchApiBase: http://10.1.7.2:8092/default replicas: 10.1.7.5:11210 | |
key: k5 master: 10.1.7.2:11210 vBucketId: 99 couchApiBase: http://10.1.7.2:8092/default replicas: 10.1.7.5:11210 | |
*/ | |
func TestVBHash(t *testing.T) { | |
b := testBucket() | |
// m := map[string]uint32{ | |
// "k0": 9, | |
// "k1": 14, | |
// "k2": 7, | |
// "k3": 0, | |
// "k4": 100, | |
// "k5": 99, | |
// } | |
// for k, v := range m { | |
// assert(t, k, b.VBHash(k), v) | |
// } | |
hit := map[uint32]string{} | |
for n := 0; n < 100000000; n++ { | |
key := fmt.Sprintf("vbfill-%d", n) | |
bid := b.VBHash(key) | |
_, ok := hit[bid] | |
if !ok { | |
hit[bid] = key | |
// fmt.Println("another", key) | |
if len(hit) == 2048 { | |
break | |
} | |
// fmt.Println("len", len(hit)) | |
} | |
} | |
if len(hit) != 2048 { | |
t.Error("not enough") | |
} | |
for _, v := range hit { | |
fmt.Printf("\"%v\",\n", v) | |
} | |
} |
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because of this...
https://issues.couchbase.com/browse/MB-12931