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add data update tracking using bloom filter (#9208)

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By monitoring PUT/DELETE and heal operations it is possible
to track changed paths and keep a bloom filter for this data. 

This can help prioritize paths to scan. The bloom filter can identify
paths that have not changed, and the few collisions will only result
in a marginal extra workload. This can be implemented on either a
bucket+(1 prefix level) with reasonable performance.

The bloom filter is set to have a false positive rate at 1% at 1M 
entries. A bloom table of this size is about ~2500 bytes when serialized.

To not force a full scan of all paths that have changed cycle bloom
filters would need to be kept, so we guarantee that dirty paths have
been scanned within cycle runs. Until cycle bloom filters have been
collected all paths are considered dirty.
This commit is contained in:
Klaus Post
2020-04-27 19:06:21 +02:00
committed by GitHub
parent eff4127efd
commit 073aac3d92
24 changed files with 1270 additions and 61 deletions
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3
go.mod
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@@ -99,11 +99,14 @@ require (
github.com/sirupsen/logrus v1.5.0
github.com/smartystreets/assertions v0.0.0-20190401211740-f487f9de1cd3 // indirect
github.com/soheilhy/cmux v0.1.4 // indirect
github.com/spaolacci/murmur3 v1.1.0 // indirect
github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94
github.com/tinylib/msgp v1.1.1
github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 // indirect
github.com/ugorji/go v1.1.5-pre // indirect
github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a
github.com/willf/bitset v1.1.10 // indirect
github.com/willf/bloom v2.0.3+incompatible
github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c
github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
go.etcd.io/bbolt v1.3.3 // indirect