129 lines
5.3 KiB
Markdown
129 lines
5.3 KiB
Markdown
## bbloom: a bitset Bloom filter for go/golang
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===
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package implements a fast bloom filter with real 'bitset' and JSONMarshal/JSONUnmarshal to store/reload the Bloom filter.
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NOTE: the package uses unsafe.Pointer to set and read the bits from the bitset. If you're uncomfortable with using the unsafe package, please consider using my bloom filter package at github.com/AndreasBriese/bloom
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===
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changelog 11/2015: new thread safe methods AddTS(), HasTS(), AddIfNotHasTS() following a suggestion from Srdjan Marinovic (github @a-little-srdjan), who used this to code a bloomfilter cache.
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This bloom filter was developed to strengthen a website-log database and was tested and optimized for this log-entry mask: "2014/%02i/%02i %02i:%02i:%02i /info.html".
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Nonetheless bbloom should work with any other form of entries.
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~~Hash function is a modified Berkeley DB sdbm hash (to optimize for smaller strings). sdbm http://www.cse.yorku.ca/~oz/hash.html~~
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Found sipHash (SipHash-2-4, a fast short-input PRF created by Jean-Philippe Aumasson and Daniel J. Bernstein.) to be about as fast. sipHash had been ported by Dimtry Chestnyk to Go (github.com/dchest/siphash )
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Minimum hashset size is: 512 ([4]uint64; will be set automatically).
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###install
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```sh
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go get github.com/AndreasBriese/bbloom
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```
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###test
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+ change to folder ../bbloom
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+ create wordlist in file "words.txt" (you might use `python permut.py`)
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+ run 'go test -bench=.' within the folder
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```go
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go test -bench=.
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```
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~~If you've installed the GOCONVEY TDD-framework http://goconvey.co/ you can run the tests automatically.~~
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using go's testing framework now (have in mind that the op timing is related to 65536 operations of Add, Has, AddIfNotHas respectively)
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### usage
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after installation add
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```go
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import (
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...
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"github.com/AndreasBriese/bbloom"
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...
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)
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```
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at your header. In the program use
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```go
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// create a bloom filter for 65536 items and 1 % wrong-positive ratio
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bf := bbloom.New(float64(1<<16), float64(0.01))
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// or
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// create a bloom filter with 650000 for 65536 items and 7 locs per hash explicitly
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// bf = bbloom.New(float64(650000), float64(7))
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// or
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bf = bbloom.New(650000.0, 7.0)
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// add one item
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bf.Add([]byte("butter"))
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// Number of elements added is exposed now
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// Note: ElemNum will not be included in JSON export (for compatability to older version)
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nOfElementsInFilter := bf.ElemNum
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// check if item is in the filter
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isIn := bf.Has([]byte("butter")) // should be true
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isNotIn := bf.Has([]byte("Butter")) // should be false
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// 'add only if item is new' to the bloomfilter
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added := bf.AddIfNotHas([]byte("butter")) // should be false because 'butter' is already in the set
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added = bf.AddIfNotHas([]byte("buTTer")) // should be true because 'buTTer' is new
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// thread safe versions for concurrent use: AddTS, HasTS, AddIfNotHasTS
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// add one item
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bf.AddTS([]byte("peanutbutter"))
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// check if item is in the filter
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isIn = bf.HasTS([]byte("peanutbutter")) // should be true
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isNotIn = bf.HasTS([]byte("peanutButter")) // should be false
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// 'add only if item is new' to the bloomfilter
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added = bf.AddIfNotHasTS([]byte("butter")) // should be false because 'peanutbutter' is already in the set
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added = bf.AddIfNotHasTS([]byte("peanutbuTTer")) // should be true because 'penutbuTTer' is new
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// convert to JSON ([]byte)
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Json := bf.JSONMarshal()
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// bloomfilters Mutex is exposed for external un-/locking
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// i.e. mutex lock while doing JSON conversion
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bf.Mtx.Lock()
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Json = bf.JSONMarshal()
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bf.Mtx.Unlock()
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// restore a bloom filter from storage
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bfNew := bbloom.JSONUnmarshal(Json)
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isInNew := bfNew.Has([]byte("butter")) // should be true
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isNotInNew := bfNew.Has([]byte("Butter")) // should be false
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```
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to work with the bloom filter.
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### why 'fast'?
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It's about 3 times faster than William Fitzgeralds bitset bloom filter https://github.com/willf/bloom . And it is about so fast as my []bool set variant for Boom filters (see https://github.com/AndreasBriese/bloom ) but having a 8times smaller memory footprint:
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Bloom filter (filter size 524288, 7 hashlocs)
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github.com/AndreasBriese/bbloom 'Add' 65536 items (10 repetitions): 6595800 ns (100 ns/op)
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github.com/AndreasBriese/bbloom 'Has' 65536 items (10 repetitions): 5986600 ns (91 ns/op)
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github.com/AndreasBriese/bloom 'Add' 65536 items (10 repetitions): 6304684 ns (96 ns/op)
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github.com/AndreasBriese/bloom 'Has' 65536 items (10 repetitions): 6568663 ns (100 ns/op)
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github.com/willf/bloom 'Add' 65536 items (10 repetitions): 24367224 ns (371 ns/op)
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github.com/willf/bloom 'Test' 65536 items (10 repetitions): 21881142 ns (333 ns/op)
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github.com/dataence/bloom/standard 'Add' 65536 items (10 repetitions): 23041644 ns (351 ns/op)
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github.com/dataence/bloom/standard 'Check' 65536 items (10 repetitions): 19153133 ns (292 ns/op)
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github.com/cabello/bloom 'Add' 65536 items (10 repetitions): 131921507 ns (2012 ns/op)
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github.com/cabello/bloom 'Contains' 65536 items (10 repetitions): 131108962 ns (2000 ns/op)
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(on MBPro15 OSX10.8.5 i7 4Core 2.4Ghz)
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With 32bit bloom filters (bloom32) using modified sdbm, bloom32 does hashing with only 2 bit shifts, one xor and one substraction per byte. smdb is about as fast as fnv64a but gives less collisions with the dataset (see mask above). bloom.New(float64(10 * 1<<16),float64(7)) populated with 1<<16 random items from the dataset (see above) and tested against the rest results in less than 0.05% collisions.
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