bloomfilter

Documentation

Overview

Package bloomfilter contains the functions needed to run part of garbage collection process.

The bloomfilter.Observer implements the ranged loop Observer interface allowing us to subscribe to the loop to get information for every segment in the metabase db.

The bloomfilter.Observer is subscribed to ranged loop instance to account for all existing segment pieces on storage nodes and create "retain requests" which contain a bloom filter of all pieces that possibly exist on a storage node. With ranged loop segments can be processed in parallel to speed up process.

The bloomfilter.Observer will send that requests to the Storj bucket after a full ranged loop iteration. After that bloom filters will be downloaded and sent to the storage nodes with separate service from storj/satellite/gc/sender package.

This bloom filter service should be run only against immutable database snapshot.

See storj/docs/design/garbage-collection.md for more info.

Index

• Constants
• type Config
• type Observer
  • func NewObserver(log *zap.Logger, config Config, overlay overlay.DB) *Observer
  • func (obs *Observer) Finish(ctx context.Context) (err error)
  • func (obs *Observer) Fork(ctx context.Context) (_ rangedloop.Partial, err error)
  • func (obs *Observer) Join(ctx context.Context, partial rangedloop.Partial) (err error)
  • func (obs *Observer) Start(ctx context.Context, startTime time.Time) (err error)
  • func (obs *Observer) TestingRetainInfos() map[storj.NodeID]*RetainInfo
• type RetainInfo
• type SyncObserver
  • func NewSyncObserver(log *zap.Logger, config Config, overlay overlay.DB) *SyncObserver
  • func (obs *SyncObserver) Finish(ctx context.Context) (err error)
  • func (obs *SyncObserver) Fork(ctx context.Context) (_ rangedloop.Partial, err error)
  • func (obs *SyncObserver) Join(ctx context.Context, partial rangedloop.Partial) (err error)
  • func (obs *SyncObserver) Process(ctx context.Context, segments []rangedloop.Segment) error
  • func (obs *SyncObserver) Start(ctx context.Context, startTime time.Time) (err error)
• type Upload
  • func NewUpload(log *zap.Logger, config Config) *Upload
  • func (bfu *Upload) CheckConfig() error
  • func (bfu *Upload) UploadBloomFilters(ctx context.Context, latestCreationDate time.Time, ...) (err error)

Constants

const LATEST = "LATEST"

LATEST is the name of the file that contains the most recently completed bloomfilter generation prefix.

Types

type Config

type Config struct {
	RunOnce bool `help:"set if garbage collection bloom filter process should only run once then exit" default:"false"`

	UseSyncObserver bool `help:"whether to use test GC SyncObserver with ranged loop" default:"true"`

	// value for InitialPieces currently based on average pieces per node
	InitialPieces      int64       `` /* 139-byte string literal not displayed */
	FalsePositiveRate  float64     `help:"the false positive rate used for creating a garbage collection bloom filter" releaseDefault:"0.1" devDefault:"0.1"`
	MaxBloomFilterSize memory.Size `help:"maximum size of a single bloom filter" default:"2m"`

	AccessGrant  string        `help:"Access Grant which will be used to upload bloom filters to the bucket" default:""`
	Bucket       string        `help:"Bucket which will be used to upload bloom filters" default:"" testDefault:"gc-queue"` // TODO do we need full location?
	ZipBatchSize int           `help:"how many bloom filters will be packed in a single zip" default:"40" testDefault:"2"`
	ExpireIn     time.Duration `` /* 130-byte string literal not displayed */
}

Config contains configurable values for garbage collection.

type Observer

type Observer struct {
	// contains filtered or unexported fields
}

Observer implements a rangedloop observer to collect bloom filters for the garbage collection.

architecture: Observer

func NewObserver

func NewObserver(log *zap.Logger, config Config, overlay overlay.DB) *Observer

NewObserver creates a new instance of the gc rangedloop observer.

func (*Observer) Finish

func (obs *Observer) Finish(ctx context.Context) (err error)

Finish uploads the bloom filters.

func (*Observer) Fork

func (obs *Observer) Fork(ctx context.Context) (_ rangedloop.Partial, err error)

Fork creates a Partial to build bloom filters over a chunk of all the segments.

func (*Observer) Join

func (obs *Observer) Join(ctx context.Context, partial rangedloop.Partial) (err error)

Join merges the bloom filters gathered by each Partial.

func (*Observer) Start

func (obs *Observer) Start(ctx context.Context, startTime time.Time) (err error)

Start is called at the beginning of each segment loop.

func (*Observer) TestingRetainInfos

func (obs *Observer) TestingRetainInfos() map[storj.NodeID]*RetainInfo

TestingRetainInfos returns retain infos collected by observer.

type RetainInfo

type RetainInfo struct {
	Filter *bloomfilter.Filter
	Count  int
}

RetainInfo contains info needed for a storage node to retain important data and delete garbage data.

type SyncObserver

type SyncObserver struct {
	// contains filtered or unexported fields
}

SyncObserver implements a rangedloop observer to collect bloom filters for the garbage collection.

func NewSyncObserver

func NewSyncObserver(log *zap.Logger, config Config, overlay overlay.DB) *SyncObserver

NewSyncObserver creates a new instance of the gc rangedloop observer.

func (*SyncObserver) Finish

func (obs *SyncObserver) Finish(ctx context.Context) (err error)

Finish uploads the bloom filters.

func (*SyncObserver) Fork

func (obs *SyncObserver) Fork(ctx context.Context) (_ rangedloop.Partial, err error)

Fork creates a Partial to build bloom filters over a chunk of all the segments.

func (*SyncObserver) Join

func (obs *SyncObserver) Join(ctx context.Context, partial rangedloop.Partial) (err error)

Join merges the bloom filters gathered by each Partial.

func (*SyncObserver) Process

func (obs *SyncObserver) Process(ctx context.Context, segments []rangedloop.Segment) error

Process adds pieces to the bloom filter from remote segments.

func (*SyncObserver) Start

func (obs *SyncObserver) Start(ctx context.Context, startTime time.Time) (err error)

Start is called at the beginning of each segment loop.

type Upload

type Upload struct {
	// contains filtered or unexported fields
}

Upload is used to upload bloom filters to specified bucket.

func NewUpload

func NewUpload(log *zap.Logger, config Config) *Upload

NewUpload creates new upload for bloom filters.

func (*Upload) CheckConfig

func (bfu *Upload) CheckConfig() error

CheckConfig check configuration values.

func (*Upload) UploadBloomFilters

func (bfu *Upload) UploadBloomFilters(ctx context.Context, latestCreationDate time.Time, retainInfos map[storj.NodeID]*RetainInfo) (err error)

UploadBloomFilters stores a zipfile with multiple bloom filters in a bucket.