lsmkv

package
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 Go to latest Published: Mar 7, 2023 License: BSD-3-Clause Imports: 33 Imported by: 0

Documentation

Overview

LSMKV (= Log-structured Merge-Tree Key-Value Store)

This package contains Weaviate's custom LSM store. While modeled after the usecases that are required for Weaviate to be fast, reliable, and scalable, it is technically completely independent. You could build your own database on top of this key-value store.

Covering the architecture of LSM Stores in general goes beyond the scope of this documentation. Therefore things that are specific to this implementation are highlighted.

Strategies

To understand the different type of buckets in this store, you need to familiarize yourself with the following strategies. A strategy defines a different usecase for a Bucket.

  • "Replace"

    Replace resembles the classical key-value store. Each key has exactly one value. A subsequent PUT on an an existing key, replaces the value (hence the name "replace"). Once replaced a former value can no longer be retrieved, and will eventually be removed in compactions.

  • "Set" (aka "SetCollection")

    A set behaves like an unordered collection of independent values. In other words a single key has multiple values. For example, for key "foo", you could have values "bar1", "bar2", "bazzinga". A bucket of this type is optimized for cheap writes to add new set additions. For example adding another set element has a fixed cost independent of the number of the existing set length. This makes it very well suited for building an inverted index.

    Retrieving a Set has a slight cost to it if a set is spread across multiple segments. This cost will eventually reduce as more and more compactions happen. In the ideal case (fully compacted DB), retrieving a Set requires just a single disk read.

  • "Map" (aka "MapCollection")

    Maps are similar to Sets in the sense that for a single key there are multiple values. However, each value is in itself a key-value pair. This makes this type very similar to a dict or hashmap type. For example for key "foo", you could have value pairs: "bar":17, "baz":19.

    This makes a map a great use case for an inverted index that needs to store additional info beyond just the docid-pointer, such as in the case of a BM25 index where the term frequency needs to be stored.

    The same performance-considerations as for sets apply.

Navigate around these docs

Good entrypoints to learn more about how this package works include Store with New and Store.CreateOrLoadBucket, as well as Bucket with Bucket.Get, Bucket.GetBySecondary, Bucket.Put, etc.

Each strategy also supports cursor types: CursorReplace can be created using Bucket.Cursor, CursorSet can be created with Bucket.SetCursor , and CursorMap can be created with Bucket.MapCursor.

Index

Constants

View Source 
const (
	// StrategyReplace allows for idem-potent PUT where the latest takes presence
	StrategyReplace       = "replace"
	StrategySetCollection = "setcollection"
	StrategyMapCollection = "mapcollection"
	StrategyRoaringSet    = "roaringset"
)

Variables

View Source 
var ErrInvalidChecksum = errors.New("invalid checksum")

ErrInvalidChecksum indicates the the read file should not be trusted. For any pre-computed data this is a recoverable issue, as the data can simply be re-computed at read-time.

Functions

func CheckExpectedStrategy added in v1.18.0 

func CheckExpectedStrategy(strategy string, expectedStrategies ...string)

func IsExpectedStrategy added in v1.18.0 

func IsExpectedStrategy(strategy string, expectedStrategies ...string) bool

func ParseCollectionNode 

func ParseCollectionNode(r io.Reader) (segmentCollectionNode, error)

func ParseCollectionNodeInto 

func ParseCollectionNodeInto(in []byte, node *segmentCollectionNode) error

ParseCollectionNodeInto takes the []byte slice and parses it into the specified node. It does not perform any copies and the caller must be aware that memory may be shared between the two. As a result, the caller must make sure that they do not modify "in" while "node" is still in use. A safer alternative is to use ParseCollectionNode.

The primary intention of this function is to provide a way to reuse buffers when the lifetime is controlled tightly, for example in cursors used within compactions. Use at your own risk!

If the buffers of the provided node have enough capacity they will be reused. Only if the capacity is not enough, will an allocation occur. This allocation uses 25% overhead to avoid future allocations for nodes of similar size.

As a result calling this method only makes sense if you plan on calling it multiple times. Calling it just once on an unitialized node does not have major advantages over calling ParseCollectionNode.

func ParseReplaceNode 

func ParseReplaceNode(r io.Reader, secondaryIndexCount uint16) (segmentReplaceNode, error)

func ParseReplaceNodeInto 

func ParseReplaceNodeInto(r io.Reader, secondaryIndexCount uint16, out *segmentReplaceNode) error

func SegmentStrategyFromString 

func SegmentStrategyFromString(in string) segmentindex.Strategy

Types

type Bucket 

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

func NewBucket 

func NewBucket(ctx context.Context, dir, rootDir string, logger logrus.FieldLogger,
	metrics *Metrics, opts ...BucketOption,
) (*Bucket, error)

NewBucket initializes a new bucket. It either loads the state from disk if it exists, or initializes new state.

You do not need to ever call NewBucket() yourself, if you are using a Store. In this case the Store can manage buckets for you, using methods such as CreateOrLoadBucket().

func (*Bucket) Count 

func (b *Bucket) Count() int

func (*Bucket) Cursor 

func (b *Bucket) Cursor() *CursorReplace

Cursor holds a RLock for the flushing state. It needs to be closed using the .Close() methods or otherwise the lock will never be relased

func (*Bucket) CursorRoaringSet added in v1.18.0 

func (b *Bucket) CursorRoaringSet() CursorRoaringSet

func (*Bucket) CursorRoaringSetKeyOnly added in v1.18.0 

func (b *Bucket) CursorRoaringSetKeyOnly() CursorRoaringSet

func (*Bucket) Delete 

func (b *Bucket) Delete(key []byte, opts ...SecondaryKeyOption) error

Delete removes the given row. Note that LSM stores are append only, thus internally this action appends a tombstone. The entry will not be removed until a compaction has run, and even then a compaction does not guarantee the removal of the data right away. This is because an entry could have been created in an older segment than those present in the compaction. This can be seen as an implementation detail, unless the caller expects to free disk space by calling this method. Such freeing is not guaranteed.

Delete is specific to the Replace Strategy. For Maps, you can use Bucket.MapDeleteKey to delete a single key-value pair, for Sets use Bucket.SetDeleteSingle to delete a single set element.

func (*Bucket) DesiredStrategy added in v1.18.0 

func (b *Bucket) DesiredStrategy() string

func (*Bucket) FlushAndSwitch 

func (b *Bucket) FlushAndSwitch() error

FlushAndSwitch is typically called periodically and does not require manual calling, but there are some situations where this might be intended, such as in test scenarios or when a force flush is desired.

func (*Bucket) FlushMemtable 

func (b *Bucket) FlushMemtable(ctx context.Context) error

FlushMemtable flushes any active memtable and returns only once the memtable has been fully flushed and a stable state on disk has been reached.

This is a preparatory stage for creating backups.

A timeout should be specified for the input context as some flushes are long-running, in which case it may be better to fail the backup attempt and retry later, than to block indefinitely.

func (*Bucket) Get 

func (b *Bucket) Get(key []byte) ([]byte, error)

Get retrieves the single value for the given key.

Get is specific to ReplaceStrategy and cannot be used with any of the other strategies. Use Bucket.SetList or Bucket.MapList instead.

Get uses the regular or "primary" key for an object. If a bucket has secondary indexes, use Bucket.GetBySecondary to retrieve an object using its secondary key

func (*Bucket) GetBySecondary 

func (b *Bucket) GetBySecondary(pos int, key []byte) ([]byte, error)

GetBySecondary retrieves an object using one of its secondary keys. A bucket can have an infinite number of secondary keys. Specify the secondary key position as the first argument.

A real-life example of secondary keys is the Weaviate object store. Objects are stored with the user-facing ID as their primary key and with the doc-id (an ever-increasing uint64) as the secondary key.

Similar to Bucket.Get, GetBySecondary is limited to ReplaceStrategy. No equivalent exists for Set and Map, as those do not support secondary indexes.

func (*Bucket) IterateObjects 

func (b *Bucket) IterateObjects(ctx context.Context, f func(object *storobj.Object) error) error

func (*Bucket) ListFiles 

func (b *Bucket) ListFiles(ctx context.Context) ([]string, error)

ListFiles lists all files that currently exist in the Bucket. The files are only in a stable state if the memtable is empty, and if compactions are paused. If one of those conditions is not given, it errors

func (*Bucket) MapCursor 

func (b *Bucket) MapCursor(cfgs ...MapListOption) *CursorMap

func (*Bucket) MapCursorKeyOnly 

func (b *Bucket) MapCursorKeyOnly(cfgs ...MapListOption) *CursorMap

func (*Bucket) MapDeleteKey 

func (b *Bucket) MapDeleteKey(rowKey, mapKey []byte) error

MapDeleteKey removes one key-value pair from the given map row. Note that LSM stores are append only, thus internally this action appends a tombstone. The entry will not be removed until a compaction has run, and even then a compaction does not guarantee the removal of the data right away. This is because an entry could have been created in an older segment than those present in the compaction. This can be seen as an implementation detail, unless the caller expects to free disk space by calling this method. Such freeing is not guaranteed.

MapDeleteKey is specific to the Map Strategy. For Replace, you can use Bucket.Delete to delete the entire row, for Sets use Bucket.SetDeleteSingle to delete a single set element.

func (*Bucket) MapList 

func (b *Bucket) MapList(key []byte, cfgs ...MapListOption) ([]MapPair, error)

MapList returns all map entries for a given row key. The order of map pairs has no specific meaning. For efficient merge operations, pair entries are stored sorted on disk, however that is an implementation detail and not a caller-facing guarantee.

MapList is specific to the Map strategy, for Sets use Bucket.SetList, for Replace use Bucket.Get.

func (*Bucket) MapSet 

func (b *Bucket) MapSet(rowKey []byte, kv MapPair) error

MapSet writes one MapPair into the map for the given row key. It is agnostic of whether the row key already exists, as well as agnostic of whether the map key already exists. In both cases it will create the entry if it does not exist or override if it does.

Example to add a new MapPair: 

pair := MapPair{Key: []byte("Jane"), Value: []byte("Backend")}
err := bucket.MapSet([]byte("developers"), pair)
if err != nil {
	/* do something */
}

MapSet is specific to the Map Strategy, for Replace use Bucket.Put, and for Set use Bucket.SetAdd instead.

func (*Bucket) MapSetMulti 

func (b *Bucket) MapSetMulti(rowKey []byte, kvs []MapPair) error

MapSetMulti is the same as Bucket.MapSet, except that it takes in multiple MapPair objects at the same time.

func (*Bucket) PauseCompaction 

func (b *Bucket) PauseCompaction(ctx context.Context) error

PauseCompaction waits for all ongoing compactions to finish, then makes sure that no new compaction can be started.

This is a preparatory stage for creating backups.

A timeout should be specified for the input context as some compactions are long-running, in which case it may be better to fail the backup attempt and retry later, than to block indefinitely.

func (*Bucket) Put 

func (b *Bucket) Put(key, value []byte, opts ...SecondaryKeyOption) error

Put creates or replaces a single value for a given key. 

err := bucket.Put([]byte("my_key"), []byte("my_value"))
 if err != nil {
	/* do something */
}

If a bucket has a secondary index configured, you can also specify one or more secondary keys, like so: 

err := bucket.Put([]byte("my_key"), []byte("my_value"),
	WithSecondaryKey(0, []byte("my_alternative_key")),
)
 if err != nil {
	/* do something */
}

Put is limited to ReplaceStrategy, use Bucket.SetAdd for Set or Bucket.MapSet and Bucket.MapSetMulti.

func (*Bucket) ResumeCompaction 

func (b *Bucket) ResumeCompaction(ctx context.Context) error

ResumeCompaction starts the compaction cycle again. It errors if compactions were not paused

func (*Bucket) RoaringSetAddBitmap added in v1.18.0 

func (b *Bucket) RoaringSetAddBitmap(key []byte, bm *sroar.Bitmap) error

func (*Bucket) RoaringSetAddList added in v1.18.0 

func (b *Bucket) RoaringSetAddList(key []byte, values []uint64) error

func (*Bucket) RoaringSetAddOne added in v1.18.0 

func (b *Bucket) RoaringSetAddOne(key []byte, value uint64) error

func (*Bucket) RoaringSetGet added in v1.18.0 

func (b *Bucket) RoaringSetGet(key []byte) (*sroar.Bitmap, error)

func (*Bucket) RoaringSetRemoveOne added in v1.18.0 

func (b *Bucket) RoaringSetRemoveOne(key []byte, value uint64) error

func (*Bucket) SetAdd 

func (b *Bucket) SetAdd(key []byte, values [][]byte) error

SetAdd adds one or more Set-Entries to a Set for the given key. SetAdd is entirely agnostic of existing entries, it acts as append-only. This also makes it agnostic of whether the key already exists or not.

Example to add two entries to a set: 

err := bucket.SetAdd([]byte("my_key"), [][]byte{
	[]byte("one-set-element"), []byte("another-set-element"),
})
if err != nil {
	/* do something */
}

SetAdd is specific to the Set strategy. For Replace, use Bucket.Put, for Map use either Bucket.MapSet or Bucket.MapSetMulti.

func (*Bucket) SetCursor 

func (b *Bucket) SetCursor() *CursorSet

SetCursor holds a RLock for the flushing state. It needs to be closed using the .Close() methods or otherwise the lock will never be relased

func (*Bucket) SetCursorKeyOnly 

func (b *Bucket) SetCursorKeyOnly() *CursorSet

SetCursorKeyOnly returns nil for all values. It has no control over the underlying "inner" cursors which may still retrieve a value which is then discarded. It does however, omit any handling of values, such as decoding, making this considerably more efficient if only keys are required.

The same locking rules as for SetCursor apply.

func (*Bucket) SetDeleteSingle 

func (b *Bucket) SetDeleteSingle(key []byte, valueToDelete []byte) error

SetDeleteSingle removes one Set element from the given key. Note that LSM stores are append only, thus internally this action appends a tombstone. The entry will not be removed until a compaction has run, and even then a compaction does not guarantee the removal of the data right away. This is because an entry could have been created in an older segment than those present in the compaction. This can be seen as an implementation detail, unless the caller expects to free disk space by calling this method. Such freeing is not guaranteed.

SetDeleteSingle is specific to the Set Strategy. For Replace, you can use Bucket.Delete to delete the entire row, for Maps use Bucket.MapDeleteKey to delete a single map entry.

func (*Bucket) SetList 

func (b *Bucket) SetList(key []byte) ([][]byte, error)

SetList returns all Set entries for a given key.

SetList is specific to the Set Strategy, for Map use Bucket.MapList, and for Replace use Bucket.Get.

func (*Bucket) SetMemtableThreshold 

func (b *Bucket) SetMemtableThreshold(size uint64)

func (*Bucket) Shutdown 

func (b *Bucket) Shutdown(ctx context.Context) error

func (*Bucket) Strategy 

func (b *Bucket) Strategy() string

func (*Bucket) UpdateStatus 

func (b *Bucket) UpdateStatus(status storagestate.Status)

UpdateStatus is used by the parent shard to communicate to the bucket when the shard has been set to readonly, or when it is ready for writes.

func (*Bucket) WasDeleted added in v1.18.0 

func (b *Bucket) WasDeleted(key []byte) (bool, error)

WasDeleted determines if an object used to exist in the LSM store

There are 3 different locations that we need to check for the key in this order: active memtable, flushing memtable, and disk segment

func (*Bucket) WriteWAL 

func (b *Bucket) WriteWAL() error

the WAL uses a buffer and isn't written until the buffer size is crossed or this function explicitly called. This allows to avoid unnecessary disk writes in larger operations, such as batches. It is sufficient to call write on the WAL just once. This does not make a batch atomic, but it guarantees that the WAL is written before a successful response is returned to the user.

type BucketOption 

type BucketOption func(b *Bucket) error

func WithDynamicMemtableSizing 

func WithDynamicMemtableSizing(
	initialMB, maxMB, minActiveSeconds, maxActiveSeconds int,
) BucketOption

func WithIdleThreshold 

func WithIdleThreshold(threshold time.Duration) BucketOption

func WithLegacyMapSorting 

func WithLegacyMapSorting() BucketOption

func WithMemtableThreshold 

func WithMemtableThreshold(threshold uint64) BucketOption

func WithMonitorCount 

func WithMonitorCount() BucketOption

func WithSecondaryIndices 

func WithSecondaryIndices(count uint16) BucketOption

func WithStrategy 

func WithStrategy(strategy string) BucketOption

func WithWalThreshold 

func WithWalThreshold(threshold uint64) BucketOption

type CommitType 

type CommitType uint16
const (
	CommitTypeReplace CommitType = iota // replace strategy

	// collection strategy - this can handle all cases as updates and deletes are
	// only appends in a collection strategy
	CommitTypeCollection
	CommitTypeRoaringSet
)

func (CommitType) Is added in v1.18.0 

func (ct CommitType) Is(checkedCommitType CommitType) bool

func (CommitType) String added in v1.18.0 

func (ct CommitType) String() string

type CursorMap 

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

func (*CursorMap) Close 

func (c *CursorMap) Close()

func (*CursorMap) First 

func (c *CursorMap) First() ([]byte, []MapPair)

func (*CursorMap) Next 

func (c *CursorMap) Next() ([]byte, []MapPair)

func (*CursorMap) Seek 

func (c *CursorMap) Seek(key []byte) ([]byte, []MapPair)

type CursorReplace 

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

func (*CursorReplace) Close 

func (c *CursorReplace) Close()

func (*CursorReplace) First 

func (c *CursorReplace) First() ([]byte, []byte)

func (*CursorReplace) Next 

func (c *CursorReplace) Next() ([]byte, []byte)

func (*CursorReplace) Seek 

func (c *CursorReplace) Seek(key []byte) ([]byte, []byte)

type CursorRoaringSet added in v1.18.0 

type CursorRoaringSet interface {
	First() ([]byte, *sroar.Bitmap)
	Next() ([]byte, *sroar.Bitmap)
	Seek([]byte) ([]byte, *sroar.Bitmap)
	Close()
}

type CursorSet 

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

func (*CursorSet) Close 

func (c *CursorSet) Close()

func (*CursorSet) First 

func (c *CursorSet) First() ([]byte, [][]byte)

func (*CursorSet) Next 

func (c *CursorSet) Next() ([]byte, [][]byte)

func (*CursorSet) Seek 

func (c *CursorSet) Seek(key []byte) ([]byte, [][]byte)

type MapListOption 

type MapListOption func(c *MapListOptionConfig)

func MapListAcceptDuplicates 

func MapListAcceptDuplicates() MapListOption

func MapListLegacySortingRequired 

func MapListLegacySortingRequired() MapListOption

type MapListOptionConfig 

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

type MapPair 

type MapPair struct {
	Key       []byte
	Value     []byte
	Tombstone bool
}

func (MapPair) Bytes 

func (kv MapPair) Bytes() ([]byte, error)

func (MapPair) EncodeBytes 

func (kv MapPair) EncodeBytes(buf []byte) error

func (*MapPair) FromBytes 

func (kv *MapPair) FromBytes(in []byte, keyOnly bool) error

func (*MapPair) FromBytesReusable 

func (kv *MapPair) FromBytesReusable(in []byte, keyOnly bool) error

func (MapPair) Size 

func (kv MapPair) Size() int

Size() returns the exact size in bytes that will be used when Bytes() is called

type Memtable 

type Memtable struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func (*Memtable) ActiveDuration 

func (l *Memtable) ActiveDuration() time.Duration

func (*Memtable) IdleDuration 

func (l *Memtable) IdleDuration() time.Duration

func (*Memtable) Size 

func (l *Memtable) Size() uint64

type Metrics 

type Metrics struct {
	CompactionReplace    *prometheus.GaugeVec
	CompactionSet        *prometheus.GaugeVec
	CompactionMap        *prometheus.GaugeVec
	CompactionRoaringSet *prometheus.GaugeVec
	ActiveSegments       *prometheus.GaugeVec

	SegmentObjects *prometheus.GaugeVec
	SegmentSize    *prometheus.GaugeVec
	SegmentCount   *prometheus.GaugeVec

	DimensionSum *prometheus.GaugeVec
	// contains filtered or unexported fields
}

func NewMetrics 

func NewMetrics(promMetrics *monitoring.PrometheusMetrics, className,
	shardName string,
) *Metrics

func (*Metrics) BloomFilterObserver 

func (m *Metrics) BloomFilterObserver(strategy, operation string) TimeObserver

func (*Metrics) MemtableOpObserver 

func (m *Metrics) MemtableOpObserver(path, strategy, op string) NsObserver

func (*Metrics) MemtableSizeSetter 

func (m *Metrics) MemtableSizeSetter(path, strategy string) Setter

func (*Metrics) ObjectCount 

func (m *Metrics) ObjectCount(count int)

func (*Metrics) TrackStartupBucket 

func (m *Metrics) TrackStartupBucket(start time.Time)

func (*Metrics) TrackStartupBucketRecovery 

func (m *Metrics) TrackStartupBucketRecovery(start time.Time)

func (*Metrics) TrackStartupReadWALDiskIO 

func (m *Metrics) TrackStartupReadWALDiskIO(read int64, nanoseconds int64)

type NsObserver 

type NsObserver func(ns int64)

type SecondaryKeyOption 

type SecondaryKeyOption func(s secondaryIndexKeys) error

func WithSecondaryKey 

func WithSecondaryKey(pos int, key []byte) SecondaryKeyOption

type SegmentGroup 

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

func (*SegmentGroup) Len 

func (sg *SegmentGroup) Len() int

type Setter 

type Setter func(val uint64)

type Store 

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

Store groups multiple buckets together, it "owns" one folder on the file system

func New 

func New(dir, rootDir string, logger logrus.FieldLogger,
	metrics *Metrics,
) (*Store, error)

New initializes a new Store based on the root dir. If state is present on disk, it is loaded, if the folder is empty a new store is initialized in there.

func (*Store) Bucket 

func (s *Store) Bucket(name string) *Bucket

func (*Store) CreateBucket added in v1.18.0 

func (s *Store) CreateBucket(ctx context.Context, bucketName string,
	opts ...BucketOption,
) error

Creates bucket, first removing any files if already exist Bucket can not be registered in bucketsByName before removal

func (*Store) CreateOrLoadBucket 

func (s *Store) CreateOrLoadBucket(ctx context.Context, bucketName string,
	opts ...BucketOption,
) error

CreateOrLoadBucket registers a bucket with the given name. If state on disk exists for this bucket it is loaded, otherwise created. Pass [BucketOptions] to configure the strategy of a bucket. The strategy defaults to "replace". For example, to load or create a map-type bucket, do: 

ctx := context.Background()
err := store.CreateOrLoadBucket(ctx, "my_bucket_name", WithStrategy(StrategyReplace))
if err != nil { /* handle error */ }

// you can now access the bucket using store.Bucket()
b := store.Bucket("my_bucket_name")

func (*Store) FlushMemtables 

func (s *Store) FlushMemtables(ctx context.Context) error

func (*Store) GetBucketsByName added in v1.18.0 

func (s *Store) GetBucketsByName() map[string]*Bucket

func (*Store) ListFiles 

func (s *Store) ListFiles(ctx context.Context) ([]string, error)

func (*Store) PauseCompaction 

func (s *Store) PauseCompaction(ctx context.Context) error

func (*Store) ReplaceBuckets added in v1.18.0 

func (s *Store) ReplaceBuckets(ctx context.Context, bucketName, replacementBucketName string) error

Replaces 1st bucket with 2nd one. Both buckets have to registered in bucketsByName. 2nd bucket swaps the 1st one in bucketsByName using 1st one's name, 2nd one's name is deleted. Dir path of 2nd bucket is changed to dir of 1st bucket as well as all other related paths of bucket resources (segment group, memtables, commit log). Dir path of 1st bucket is temporarily suffixed with "___del", later on bucket is shutdown and its files deleted. 2nd bucket becomes 1st bucket

func (*Store) ResumeCompaction 

func (s *Store) ResumeCompaction(ctx context.Context) error

func (*Store) Shutdown 

func (s *Store) Shutdown(ctx context.Context) error

func (*Store) UpdateBucketsStatus 

func (s *Store) UpdateBucketsStatus(targetStatus storagestate.Status)

func (*Store) WriteWALs 

func (s *Store) WriteWALs() error

type TimeObserver 

type TimeObserver func(start time.Time)

Source Files

View all Source files

Directories

Path Synopsis
ent contains common types used throughout various lsmkv (sub-)packages
 ent contains common types used throughout various lsmkv (sub-)packages
The "roaringset" package contains all the LSM business logic that is unique to the "RoaringSet" strategy
 The "roaringset" package contains all the LSM business logic that is unique to the "RoaringSet" strategy

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