storage

package
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 Go to latest Published: Sep 6, 2015 License: Apache-2.0 Imports: 34 Imported by: 0

Documentation

Overview

Package storage provides access to the Store and Range abstractions. Each Cockroach node handles one or more stores, each of which multiplexes to one or more ranges, identified by [start, end) keys. Ranges are contiguous regions of the keyspace. Each range implements an instance of the Raft consensus algorithm to synchronize participating range replicas.

Each store is represented by a single engine.Engine instance. The ranges hosted by a store all have access to the same engine, but write to only a range-limited keyspace within it. Ranges access the underlying engine via the MVCC interface, which provides historical versioned values. 

Package storage is a generated protocol buffer package.

It is generated from these files:
	cockroach/storage/status.proto

It has these top-level messages:
	StoreStatus
Example (Rebalancing) 
// Model a set of stores in a cluster,
// randomly adding / removing stores and adding bytes.
g := gossip.New(nil, 0, nil)
stopper := stop.NewStopper()
defer stopper.Stop()
sp := NewStorePool(g, TestTimeUntilStoreDeadOff, stopper)
alloc := makeAllocator(sp)
alloc.randGen = rand.New(rand.NewSource(0))
alloc.deterministic = true

var wg sync.WaitGroup
g.RegisterCallback(gossip.MakePrefixPattern(gossip.KeyStorePrefix), func(_ string, _ []byte) { wg.Done() })

const generations = 100
const nodes = 20

// Initialize testStores.
var testStores [nodes]testStore
for i := 0; i < len(testStores); i++ {
	testStores[i].StoreID = proto.StoreID(i)
	testStores[i].Node = proto.NodeDescriptor{NodeID: proto.NodeID(i)}
	testStores[i].Capacity = proto.StoreCapacity{Capacity: 1 << 30, Available: 1 << 30}
}
// Initialize the cluster with a single range.
testStores[0].add(alloc.randGen.Int63n(1 << 20))

for i := 0; i < generations; i++ {
	// First loop through test stores and add data.
	wg.Add(len(testStores))
	for j := 0; j < len(testStores); j++ {
		// Add a pretend range to the testStore if there's already one.
		if testStores[j].Capacity.RangeCount > 0 {
			testStores[j].add(alloc.randGen.Int63n(1 << 20))
		}
		key := gossip.MakeStoreKey(proto.StoreID(j))
		if err := g.AddInfoProto(key, &testStores[j].StoreDescriptor, 0); err != nil {
			panic(err)
		}
	}
	wg.Wait()

	// Next loop through test stores and maybe rebalance.
	for j := 0; j < len(testStores); j++ {
		ts := &testStores[j]
		if alloc.shouldRebalance(&testStores[j].StoreDescriptor) {
			target := alloc.rebalanceTarget(proto.Attributes{}, []proto.Replica{{NodeID: ts.Node.NodeID, StoreID: ts.StoreID}})
			if target != nil {
				testStores[j].rebalance(&testStores[int(target.StoreID)], alloc.randGen.Int63n(1<<20))
			}
		}
	}

	// Output store capacities as hexidecimal 2-character values.
	if i%(generations/50) == 0 {
		var maxBytes int64
		for j := 0; j < len(testStores); j++ {
			bytes := testStores[j].Capacity.Capacity - testStores[j].Capacity.Available
			if bytes > maxBytes {
				maxBytes = bytes
			}
		}
		if maxBytes > 0 {
			for j := 0; j < len(testStores); j++ {
				endStr := " "
				if j == len(testStores)-1 {
					endStr = ""
				}
				bytes := testStores[j].Capacity.Capacity - testStores[j].Capacity.Available
				fmt.Printf("%03d%s", (999*bytes)/maxBytes, endStr)
			}
			fmt.Printf("\n")
		}
	}
}

var totBytes int64
var totRanges int32
for i := 0; i < len(testStores); i++ {
	totBytes += testStores[i].Capacity.Capacity - testStores[i].Capacity.Available
	totRanges += testStores[i].Capacity.RangeCount
}
fmt.Printf("Total bytes=%d, ranges=%d\n", totBytes, totRanges)

Output:

999 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 739 000 000
999 107 000 000 000 000 000 000 000 000 177 000 000 000 204 000 000 734 000 000
929 288 000 168 000 057 623 000 114 272 471 000 000 565 385 000 000 999 000 284
683 367 133 087 000 527 381 607 379 380 502 000 188 824 490 295 420 999 000 490
540 443 380 319 000 438 382 534 599 579 602 000 268 859 601 374 450 999 000 532
412 428 539 429 170 332 424 696 505 439 503 691 327 752 427 437 451 999 076 441
496 583 662 586 280 431 499 714 564 578 540 661 431 784 548 516 547 999 329 589
502 563 646 541 430 428 576 693 633 578 537 577 455 803 573 596 528 999 402 639
603 641 764 638 764 521 650 764 713 683 648 652 579 860 610 731 665 999 463 749
615 642 779 688 813 459 650 791 728 702 743 614 526 829 600 767 760 999 497 700
677 677 879 787 867 518 700 852 775 801 793 666 526 820 601 843 767 999 544 772
723 696 866 838 853 589 730 882 800 768 782 695 567 776 656 836 832 999 613 832
830 764 936 879 976 673 824 974 864 825 835 761 703 874 700 909 888 999 635 957
832 766 949 842 995 730 839 965 870 843 790 765 693 931 706 936 936 999 683 948
866 787 990 851 999 780 867 968 892 847 783 787 708 912 768 963 951 954 681 942
844 768 995 866 999 811 836 952 931 849 764 763 716 923 758 980 907 921 705 927
866 780 999 897 979 844 858 975 968 897 762 772 739 939 731 984 909 912 752 931
895 818 999 918 991 884 916 936 942 899 790 780 775 930 779 976 963 893 752 920
832 782 999 865 978 854 908 902 887 886 760 785 747 903 762 924 911 830 750 876
864 804 999 856 987 855 939 911 905 909 735 818 808 909 757 941 956 807 761 875
892 839 999 901 977 871 933 930 931 910 766 812 831 908 768 969 935 861 793 867
908 858 982 911 994 872 947 951 960 935 798 832 835 895 786 999 951 873 790 863
881 863 963 908 991 845 919 941 959 939 801 815 832 876 783 999 959 877 798 822
907 929 962 930 942 904 901 925 955 940 871 985 921 902 873 999 991 894 908 926
892 923 956 939 976 961 904 933 958 942 914 979 925 907 940 999 982 906 929 922
913 928 940 921 930 913 913 929 925 918 920 963 923 923 940 999 928 909 923 948
924 950 910 947 926 918 917 933 944 920 907 917 911 920 914 999 921 909 915 939
908 933 920 946 940 936 935 931 957 924 914 914 915 936 929 999 929 934 924 906
946 943 954 968 961 966 966 935 951 940 935 959 949 950 938 996 941 981 955 999
940 926 938 941 930 935 934 935 958 897 941 955 931 943 944 971 949 941 972 999
950 952 944 957 935 953 951 938 972 932 957 988 943 950 970 961 947 968 970 999
966 959 957 945 956 964 973 947 991 946 966 985 966 980 986 962 967 958 959 999
941 964 956 979 959 983 992 937 999 948 976 961 950 996 987 944 968 949 961 968
982 975 932 950 960 969 955 980 977 944 956 944 920 943 999 940 947 938 937 951
977 970 935 953 960 965 980 957 991 943 938 956 945 971 999 936 939 952 948 944
993 969 987 951 988 979 999 966 983 957 948 971 971 956 990 958 967 955 979 983
969 935 955 952 936 961 979 943 975 954 938 957 967 959 950 977 940 999 956 964
964 953 975 956 923 972 978 952 974 962 939 946 952 947 952 984 944 999 947 974
957 966 969 951 950 977 984 935 940 954 962 956 957 953 952 965 943 999 957 975
974 984 982 953 947 968 999 953 940 956 972 946 973 954 948 958 953 987 970 961
976 980 976 948 946 955 999 963 952 962 962 941 955 946 926 944 952 951 957 944
988 975 951 938 957 972 999 963 973 963 968 948 958 948 945 954 963 943 945 959
999 977 958 930 955 957 993 954 983 955 952 945 953 947 923 963 945 939 972 953
999 970 928 975 945 938 983 956 954 933 939 938 940 921 923 958 935 933 962 938
999 970 915 961 935 923 993 932 929 926 935 925 927 931 917 947 938 929 959 921
999 949 953 933 929 952 984 922 935 943 931 942 932 951 934 957 935 926 947 920
999 957 948 937 943 951 992 926 927 938 930 934 943 953 946 945 938 935 953 941
999 958 962 932 934 938 989 935 930 921 927 935 932 957 926 945 935 921 949 932
989 962 950 942 927 941 999 943 926 936 931 930 926 959 923 943 931 928 951 945
999 960 952 934 933 935 995 939 928 938 924 929 971 946 927 950 932 933 943 947
Total bytes=1001793961, ranges=1898

Index

Examples

Constants

View Source 
const (
	// DefaultHeartbeatInterval is how often heartbeats are sent from the
	// transaction coordinator to a live transaction. These keep it from
	// being preempted by other transactions writing the same keys. If a
	// transaction fails to be heartbeat within 2x the heartbeat interval,
	// it may be aborted by conflicting txns.
	DefaultHeartbeatInterval = 5 * time.Second
)
View Source 
const (

	// DefaultLeaderLeaseDuration is the default duration of the leader lease.
	DefaultLeaderLeaseDuration = time.Second
)

raftInitialLogIndex is the starting point for the raft log. We bootstrap the raft membership by synthesizing a snapshot as if there were some discarded prefix to the log, so we must begin the log at an arbitrary index greater than 1.

View Source 
const (
	// GCResponseCacheExpiration is the expiration duration for response
	// cache entries.
	GCResponseCacheExpiration = 1 * time.Hour
)
View Source 
const (
	// MinTSCacheWindow specifies the minimum duration to hold entries in
	// the cache before allowing eviction. After this window expires,
	// transactions writing to this node with timestamps lagging by more
	// than minCacheWindow will necessarily have to advance their commit
	// timestamp.
	MinTSCacheWindow = 10 * time.Second
)
View Source 
const (

	// RangeGCQueueInactivityThreshold is the inactivity duration after which
	// a range will be considered for garbage collection. Exported for testing.
	RangeGCQueueInactivityThreshold = 10 * 24 * time.Hour // 10 days
)
View Source 
const (

	// TestTimeUntilStoreDeadOff is the test value for TimeUntilStoreDead that
	// prevents the store pool from marking stores as dead.
	TestTimeUntilStoreDeadOff = 24 * time.Hour
)

Variables

View Source 
var (
	ErrInvalidLengthStatus = fmt.Errorf("proto: negative length found during unmarshaling")
)
View Source 
var (

	// TestStoreContext has some fields initialized with values relevant
	// in tests.
	TestStoreContext = StoreContext{
		RaftTickInterval:           100 * time.Millisecond,
		RaftHeartbeatIntervalTicks: 1,
		RaftElectionTimeoutTicks:   2,
		ScanInterval:               10 * time.Minute,
	}
)
View Source 
var TestingCommandFilter func(proto.Request) error

TestingCommandFilter may be set in tests to intercept the handling of commands and artificially generate errors. Return nil to continue with regular processing or non-nil to terminate processing with the returned error. Note that in a multi-replica test this filter will be run once for each replica and must produce consistent results each time. Should only be used in tests in the storage and storage_test packages.

Functions

func DeleteRange 

func DeleteRange(txn *client.Txn, b *client.Batch, key proto.Key) error

DeleteRange removes a range from the RangeTree. This should only be called from operations that remove ranges, such as AdminMerge.

func InsertRange 

func InsertRange(txn *client.Txn, b *client.Batch, key proto.Key) error

InsertRange adds a new range to the RangeTree. This should only be called from operations that create new ranges, such as AdminSplit.

func ProcessStoreEvent 

func ProcessStoreEvent(l StoreEventListener, event interface{})

ProcessStoreEvent dispatches an event on the StoreEventListener.

func SetupRangeTree 

func SetupRangeTree(batch engine.Engine, ms *engine.MVCCStats, timestamp proto.Timestamp, startKey proto.Key) error

SetupRangeTree creates a new RangeTree. This should only be called as part of store.BootstrapRange.

Types

type BeginScanRangesEvent 

type BeginScanRangesEvent struct {
	StoreID proto.StoreID
}

BeginScanRangesEvent occurs when the store is about to scan over all ranges. During such a scan, each existing range will be published to the feed as a RegisterRangeEvent with the Scan flag set. This is used because downstream consumers may be tracking statistics via the Deltas in UpdateRangeEvent; this event informs subscribers to clear currently cached values.

type CommandQueue 

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

A CommandQueue maintains an interval tree of keys or key ranges for executing commands. New commands affecting keys or key ranges must wait on already-executing commands which overlap their key range.

Before executing, a command invokes GetWait() to initialize a WaitGroup with the number of overlapping commands which are already running. The wait group is waited on by the caller for confirmation that all overlapping, pending commands have completed and the pending command can proceed.

After waiting, a command is added to the queue's already-executing set via Add(). Add accepts a parameter indicating whether the command is read-only. Read-only commands don't need to wait on other read-only commands, so the wait group returned via GetWait() doesn't include read-only on read-only overlapping commands as an optimization.

Once commands complete, Remove() is invoked to remove the executing command and decrement the counts on any pending WaitGroups, possibly signaling waiting commands who were gated by the executing command's affected key(s).

CommandQueue is not thread safe.

func NewCommandQueue 

func NewCommandQueue() *CommandQueue

NewCommandQueue returns a new command queue.

func (*CommandQueue) Add 

func (cq *CommandQueue) Add(start, end proto.Key, readOnly bool) interface{}

Add adds a command to the queue which affects the specified key range. If end is empty, it is set to start.Next(), meaning the command affects a single key. The returned interface is the key for the command queue and must be re-supplied on subsequent invocation of Remove().

Add should be invoked after waiting on already-executing, overlapping commands via the WaitGroup initialized through GetWait().

func (*CommandQueue) Clear 

func (cq *CommandQueue) Clear()

Clear removes all executing commands, signaling any waiting commands.

func (*CommandQueue) GetWait 

func (cq *CommandQueue) GetWait(start, end proto.Key, readOnly bool, wg *sync.WaitGroup)

GetWait initializes the supplied wait group with the number of executing commands which overlap the specified key range. If end is empty, end is set to start.Next(), meaning the command affects a single key. The caller should call wg.Wait() to wait for confirmation that all gating commands have completed or failed. readOnly is true if the requester is a read-only command; false for read-write.

func (*CommandQueue) Remove 

func (cq *CommandQueue) Remove(key interface{})

Remove is invoked to signal that the command associated with the specified key has completed and should be removed. Any pending commands waiting on this command will be signaled if this is the only command upon which they are still waiting.

Remove is invoked after a mutating command has been committed to the Raft log and applied to the underlying state machine. Similarly, Remove is invoked after a read-only command has been executed against the underlying state machine.

type EndScanRangesEvent 

type EndScanRangesEvent struct {
	StoreID proto.StoreID
}

EndScanRangesEvent occurs when the store has finished scanning all ranges. Every BeginScanRangeEvent will eventually be followed by an EndScanRangeEvent.

type MergeRangeEvent 

type MergeRangeEvent struct {
	StoreID proto.StoreID
	Merged  UpdateRangeEvent
	Removed RemoveRangeEvent
}

MergeRangeEvent occurs whenever a range is merged into another. This Event contains two component events: an UpdateRangeEvent for the range which subsumed the other, and a RemoveRangeEvent for the range that was subsumed.

type NotBootstrappedError 

type NotBootstrappedError struct{}

A NotBootstrappedError indicates that an engine has not yet been bootstrapped due to a store identifier not being present.

func (*NotBootstrappedError) Error 

func (e *NotBootstrappedError) Error() string

Error formats error.

type RegisterRangeEvent 

type RegisterRangeEvent struct {
	StoreID proto.StoreID
	Desc    *proto.RangeDescriptor
	Stats   engine.MVCCStats
	Scan    bool
}

RegisterRangeEvent occurs in two scenarios. Firstly, while a store broadcasts its list of ranges to initialize one or more new accumulators (with Scan set to true), or secondly, when a new range is initialized on the store (for example through replication), with Scan set to false. This event includes the Range's RangeDescriptor and current MVCCStats.

type RemoveRangeEvent 

type RemoveRangeEvent struct {
	StoreID proto.StoreID
	Desc    *proto.RangeDescriptor
	Stats   engine.MVCCStats
}

RemoveRangeEvent occurs whenever a Range is removed from a store. This structure includes the Range's RangeDescriptor and the Range's previous MVCCStats before it was removed.

type Replica 

type Replica struct {
	sync.RWMutex // Protects the following fields:
	// contains filtered or unexported fields
}

A Replica is a contiguous keyspace with writes managed via an instance of the Raft consensus algorithm. Many ranges may exist in a store and they are unlikely to be contiguous. Ranges are independent units and are responsible for maintaining their own integrity by replacing failed replicas, splitting and merging as appropriate.

func NewReplica 

func NewReplica(desc *proto.RangeDescriptor, rm rangeManager) (*Replica, error)

NewReplica initializes the replica using the given metadata.

func (*Replica) AddCmd 

func (r *Replica) AddCmd(ctx context.Context, args proto.Request) (proto.Response, error)

AddCmd adds a command for execution on this range. The command's affected keys are verified to be contained within the range and the range's leadership is confirmed. The command is then dispatched either along the read-only execution path or the read-write Raft command queue.

func (*Replica) AdminMerge 

func (r *Replica) AdminMerge(args proto.AdminMergeRequest, desc *proto.RangeDescriptor) (proto.AdminMergeResponse, error)

AdminMerge extends the range to subsume the range that comes next in the key space. The range being subsumed is provided in args.SubsumedRange. The EndKey of the subsuming range must equal the start key of the range being subsumed. The merge is performed inside of a distributed transaction which writes the updated range descriptor for the subsuming range and deletes the range descriptor for the subsumed one. It also updates the range addressing metadata. The handover of responsibility for the reassigned key range is carried out seamlessly through a merge trigger carried out as part of the commit of that transaction. A merge requires that the two ranges are collocate on the same set of replicas.

The supplied RangeDescriptor is used as a form of optimistic lock. See the comment of "AdminSplit" for more information on this pattern.

func (*Replica) AdminSplit 

func (r *Replica) AdminSplit(args proto.AdminSplitRequest, desc *proto.RangeDescriptor) (proto.AdminSplitResponse, error)

AdminSplit divides the range into into two ranges, using either args.SplitKey (if provided) or an internally computed key that aims to roughly equipartition the range by size. The split is done inside of a distributed txn which writes updated and new range descriptors, and updates the range addressing metadata. The handover of responsibility for the reassigned key range is carried out seamlessly through a split trigger carried out as part of the commit of that transaction.

The supplied RangeDescriptor is used as a form of optimistic lock. An operation which might split a range should obtain a copy of the range's current descriptor before making the decision to split. If the decision is affirmative the descriptor is passed to AdminSplit, which performs a Conditional Put on the RangeDescriptor to ensure that no other operation has modified the range in the time the decision was being made.

func (*Replica) Append 

func (r *Replica) Append(entries []raftpb.Entry) error

Append implements the multiraft.WriteableGroupStorage interface.

func (*Replica) ApplySnapshot 

func (r *Replica) ApplySnapshot(snap raftpb.Snapshot) error

ApplySnapshot implements the multiraft.WriteableGroupStorage interface.

func (*Replica) ChangeReplicas 

func (r *Replica) ChangeReplicas(changeType proto.ReplicaChangeType, replica proto.Replica, desc *proto.RangeDescriptor) error

ChangeReplicas adds or removes a replica of a range. The change is performed in a distributed transaction and takes effect when that transaction is committed. When removing a replica, only the NodeID and StoreID fields of the Replica are used.

The supplied RangeDescriptor is used as a form of optimistic lock. See the comment of "AdminSplit" for more information on this pattern.

func (*Replica) ConditionalPut 

func (r *Replica) ConditionalPut(batch engine.Engine, ms *engine.MVCCStats, args proto.ConditionalPutRequest) (proto.ConditionalPutResponse, error)

ConditionalPut sets the value for a specified key only if the expected value matches. If not, the return value contains the actual value.

func (*Replica) ContainsKey 

func (r *Replica) ContainsKey(key proto.Key) bool

ContainsKey returns whether this range contains the specified key.

func (*Replica) ContainsKeyRange 

func (r *Replica) ContainsKeyRange(start, end proto.Key) bool

ContainsKeyRange returns whether this range contains the specified key range from start to end.

func (*Replica) Delete 

func (r *Replica) Delete(batch engine.Engine, ms *engine.MVCCStats, args proto.DeleteRequest) (proto.DeleteResponse, error)

Delete deletes the key and value specified by key.

func (*Replica) DeleteRange 

func (r *Replica) DeleteRange(batch engine.Engine, ms *engine.MVCCStats, args proto.DeleteRangeRequest) (proto.DeleteRangeResponse, error)

DeleteRange deletes the range of key/value pairs specified by start and end keys.

func (*Replica) Desc 

func (r *Replica) Desc() *proto.RangeDescriptor

Desc atomically returns the range's descriptor.

func (*Replica) Destroy 

func (r *Replica) Destroy() error

Destroy cleans up all data associated with this range.

func (*Replica) EndTransaction 

func (r *Replica) EndTransaction(batch engine.Engine, ms *engine.MVCCStats, args proto.EndTransactionRequest) (proto.EndTransactionResponse, []proto.Intent, error)

EndTransaction either commits or aborts (rolls back) an extant transaction according to the args.Commit parameter.

func (*Replica) Entries 

func (r *Replica) Entries(lo, hi, maxBytes uint64) ([]raftpb.Entry, error)

Entries implements the raft.Storage interface. Note that maxBytes is advisory and this method will always return at least one entry even if it exceeds maxBytes. Passing maxBytes equal to zero disables size checking. TODO(bdarnell): consider caching for recent entries, if rocksdb's builtin caching is insufficient.

func (*Replica) FirstIndex 

func (r *Replica) FirstIndex() (uint64, error)

FirstIndex implements the raft.Storage interface.

func (*Replica) GC 

func (r *Replica) GC(batch engine.Engine, ms *engine.MVCCStats, args proto.GCRequest) (proto.GCResponse, error)

GC iterates through the list of keys to garbage collect specified in the arguments. MVCCGarbageCollect is invoked on each listed key along with the expiration timestamp. The GC metadata specified in the args is persisted after GC.

func (*Replica) Get 

func (r *Replica) Get(batch engine.Engine, args proto.GetRequest) (proto.GetResponse, []proto.Intent, error)

Get returns the value for a specified key.

func (*Replica) GetGCMetadata 

func (r *Replica) GetGCMetadata() (*proto.GCMetadata, error)

GetGCMetadata reads the latest GC metadata for this range.

func (*Replica) GetLastVerificationTimestamp 

func (r *Replica) GetLastVerificationTimestamp() (proto.Timestamp, error)

GetLastVerificationTimestamp reads the timestamp at which the range's data was last verified.

func (*Replica) GetMVCCStats 

func (r *Replica) GetMVCCStats() engine.MVCCStats

GetMVCCStats returns a copy of the MVCC stats object for this range.

func (*Replica) GetMaxBytes 

func (r *Replica) GetMaxBytes() int64

GetMaxBytes atomically gets the range maximum byte limit.

func (*Replica) GetReplica 

func (r *Replica) GetReplica() *proto.Replica

GetReplica returns the replica for this range from the range descriptor. Returns nil if the replica is not found.

func (*Replica) HeartbeatTxn 

func (r *Replica) HeartbeatTxn(batch engine.Engine, ms *engine.MVCCStats, args proto.HeartbeatTxnRequest) (proto.HeartbeatTxnResponse, error)

HeartbeatTxn updates the transaction status and heartbeat timestamp after receiving transaction heartbeat messages from coordinator. Returns the updated transaction.

func (*Replica) Increment 

func (r *Replica) Increment(batch engine.Engine, ms *engine.MVCCStats, args proto.IncrementRequest) (proto.IncrementResponse, error)

Increment increments the value (interpreted as varint64 encoded) and returns the newly incremented value (encoded as varint64). If no value exists for the key, zero is incremented.

func (*Replica) InitialState 

func (r *Replica) InitialState() (raftpb.HardState, raftpb.ConfState, error)

InitialState implements the raft.Storage interface.

func (*Replica) IsFirstRange 

func (r *Replica) IsFirstRange() bool

IsFirstRange returns true if this is the first range.

func (*Replica) LastIndex 

func (r *Replica) LastIndex() (uint64, error)

LastIndex implements the raft.Storage interface.

func (*Replica) LeaderLease 

func (r *Replica) LeaderLease(batch engine.Engine, ms *engine.MVCCStats, args proto.LeaderLeaseRequest) (proto.LeaderLeaseResponse, error)

LeaderLease sets the leader lease for this range. The command fails only if the desired start timestamp collides with a previous lease. Otherwise, the start timestamp is wound back to right after the expiration of the previous lease (or zero). If this range replica is already the lease holder, the expiration will be extended or shortened as indicated. For a new lease, all duties required of the range leader are commenced, including clearing the command queue and timestamp cache.

func (*Replica) Less 

func (r *Replica) Less(i btree.Item) bool

Less returns true if the range's end key is less than the given item's key.

func (*Replica) Merge 

func (r *Replica) Merge(batch engine.Engine, ms *engine.MVCCStats, args proto.MergeRequest) (proto.MergeResponse, error)

Merge is used to merge a value into an existing key. Merge is an efficient accumulation operation which is exposed by RocksDB, used by Cockroach for the efficient accumulation of certain values. Due to the difficulty of making these operations transactional, merges are not currently exposed directly to clients. Merged values are explicitly not MVCC data.

func (*Replica) PushTxn 

func (r *Replica) PushTxn(batch engine.Engine, ms *engine.MVCCStats, args proto.PushTxnRequest) (proto.PushTxnResponse, error)

PushTxn resolves conflicts between concurrent txns (or between a non-transactional reader or writer and a txn) in several ways depending on the statuses and priorities of the conflicting transactions. The PushTxn operation is invoked by a "pusher" (the writer trying to abort a conflicting txn or the reader trying to push a conflicting txn's commit timestamp forward), who attempts to resolve a conflict with a "pushee" (args.PushTxn -- the pushee txn whose intent(s) caused the conflict).

Txn already committed/aborted: If pushee txn is committed or aborted return success.

Txn Timeout: If pushee txn entry isn't present or its LastHeartbeat timestamp isn't set, use PushTxn.Timestamp as LastHeartbeat. If current time - LastHeartbeat > 2 * DefaultHeartbeatInterval, then the pushee txn should be either pushed forward, aborted, or confirmed not pending, depending on value of Request.PushType.

Old Txn Epoch: If persisted pushee txn entry has a newer Epoch than PushTxn.Epoch, return success, as older epoch may be removed.

Lower Txn Priority: If pushee txn has a lower priority than pusher, adjust pushee's persisted txn depending on value of args.PushType. If args.PushType is ABORT_TXN, set txn.Status to ABORTED, and priority to one less than the pusher's priority and return success. If args.PushType is PUSH_TIMESTAMP, set txn.Timestamp to pusher's Timestamp + 1 (note that we use the pusher's Args.Timestamp, not Txn.Timestamp because the args timestamp can advance during the txn).

Higher Txn Priority: If pushee txn has a higher priority than pusher, return TransactionPushError. Transaction will be retried with priority one less than the pushee's higher priority.

func (*Replica) Put 

func (r *Replica) Put(batch engine.Engine, ms *engine.MVCCStats, args proto.PutRequest) (proto.PutResponse, error)

Put sets the value for a specified key.

func (*Replica) RangeLookup 

func (r *Replica) RangeLookup(batch engine.Engine, args proto.RangeLookupRequest) (proto.RangeLookupResponse, []proto.Intent, error)

RangeLookup is used to look up RangeDescriptors - a RangeDescriptor is a metadata structure which describes the key range and replica locations of a distinct range in the cluster.

RangeDescriptors are stored as values in the cockroach cluster's key-value store. However, they are always stored using special "Range Metadata keys", which are "ordinary" keys with a special prefix prepended. The Range Metadata Key for an ordinary key can be generated with the `keys.RangeMetaKey(key)` function. The RangeDescriptor for the range which contains a given key can be retrieved by generating its Range Metadata Key and dispatching it to RangeLookup.

Note that the Range Metadata Key sent to RangeLookup is NOT the key at which the desired RangeDescriptor is stored. Instead, this method returns the RangeDescriptor stored at the _lowest_ existing key which is _greater_ than the given key. The returned RangeDescriptor will thus contain the ordinary key which was originally used to generate the Range Metadata Key sent to RangeLookup.

The "Range Metadata Key" for a range is built by appending the end key of the range to the respective meta prefix.

Lookups for range metadata keys usually want to read inconsistently, but some callers need a consistent result; both are supported.

This method has an important optimization in the inconsistent case: instead of just returning the request RangeDescriptor, it also returns a slice of additional range descriptors immediately consecutive to the desired RangeDescriptor. This is intended to serve as a sort of caching pre-fetch, so that the requesting nodes can aggressively cache RangeDescriptors which are likely to be desired by their current workload. The Reverse flag specifies whether descriptors are prefetched in descending or ascending order.

func (*Replica) ResolveIntent 

func (r *Replica) ResolveIntent(batch engine.Engine, ms *engine.MVCCStats, args proto.ResolveIntentRequest) (proto.ResolveIntentResponse, error)

ResolveIntent resolves a write intent from the specified key according to the status of the transaction which created it.

func (*Replica) ResolveIntentRange 

func (r *Replica) ResolveIntentRange(batch engine.Engine, ms *engine.MVCCStats,
	args proto.ResolveIntentRangeRequest) (proto.ResolveIntentRangeResponse, error)

ResolveIntentRange resolves write intents in the specified key range according to the status of the transaction which created it.

func (*Replica) ReverseScan 

func (r *Replica) ReverseScan(batch engine.Engine, args proto.ReverseScanRequest) (proto.ReverseScanResponse, []proto.Intent, error)

ReverseScan scans the key range specified by start key through end key in descending order up to some maximum number of results.

func (*Replica) Scan 

func (r *Replica) Scan(batch engine.Engine, args proto.ScanRequest) (proto.ScanResponse, []proto.Intent, error)

Scan scans the key range specified by start key through end key in ascending order up to some maximum number of results.

func (*Replica) SetHardState 

func (r *Replica) SetHardState(st raftpb.HardState) error

SetHardState implements the multiraft.WriteableGroupStorage interface.

func (*Replica) SetLastVerificationTimestamp 

func (r *Replica) SetLastVerificationTimestamp(timestamp proto.Timestamp) error

SetLastVerificationTimestamp writes the timestamp at which the range's data was last verified.

func (*Replica) SetMaxBytes 

func (r *Replica) SetMaxBytes(maxBytes int64)

SetMaxBytes atomically sets the maximum byte limit before split. This value is cached by the range for efficiency.

func (*Replica) Snapshot 

func (r *Replica) Snapshot() (raftpb.Snapshot, error)

Snapshot implements the raft.Storage interface.

func (*Replica) String 

func (r *Replica) String() string

String returns a string representation of the range.

func (*Replica) Term 

func (r *Replica) Term(i uint64) (uint64, error)

Term implements the raft.Storage interface.

func (*Replica) TruncateLog 

func (r *Replica) TruncateLog(batch engine.Engine, ms *engine.MVCCStats, args proto.TruncateLogRequest) (proto.TruncateLogResponse, error)

TruncateLog discards a prefix of the raft log.

func (*Replica) WaitForLeaderLease 

func (r *Replica) WaitForLeaderLease(t util.Tester)

WaitForLeaderLease is used from unittests to wait until this range has the leader lease.

type ReplicationStatusEvent 

type ReplicationStatusEvent struct {
	StoreID proto.StoreID

	// Per-range availability information, which is currently computed by
	// periodically polling the ranges of each store.
	// TODO(mrtracy): See if this information could be computed incrementally
	// from other events.
	LeaderRangeCount     int32
	ReplicatedRangeCount int32
	AvailableRangeCount  int32
}

ReplicationStatusEvent contains statistics on the replication status of the ranges in the store.

Because these statistics cannot currently be computed from other events, this event should be periodically broadcast by the store independently of other operations.

type ResponseCache 

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

A ResponseCache provides idempotence for request retries. Each request to a range specifies a ClientCmdID in the request header which uniquely identifies a client command. After commands have been replicated via Raft, they are executed against the state machine and the results are stored in the ResponseCache.

The ResponseCache stores responses in the underlying engine, using keys derived from the Range ID and the ClientCmdID.

A ResponseCache is not thread safe. Access to it is serialized through Raft.

func NewResponseCache 

func NewResponseCache(rangeID proto.RangeID) *ResponseCache

NewResponseCache returns a new response cache. Every range replica maintains a response cache, not just the leader. However, when a replica loses or gains leadership of the Raft consensus group, the inflight map should be cleared.

func (*ResponseCache) ClearData 

func (rc *ResponseCache) ClearData(e engine.Engine) error

ClearData removes all items stored in the persistent cache. It does not alter the inflight map.

func (*ResponseCache) CopyFrom 

func (rc *ResponseCache) CopyFrom(e engine.Engine, originRangeID proto.RangeID) error

CopyFrom copies all the cached results from the originRangeID response cache into this one. Note that the cache will not be locked while copying is in progress. Failures decoding individual cache entries return an error. The copy is done directly using the engine instead of interpreting values through MVCC for efficiency.

func (*ResponseCache) CopyInto 

func (rc *ResponseCache) CopyInto(e engine.Engine, destRangeID proto.RangeID) error

CopyInto copies all the cached results from this response cache into the destRangeID response cache. Failures decoding individual cache entries return an error.

func (*ResponseCache) GetResponse 

func (rc *ResponseCache) GetResponse(e engine.Engine, cmdID proto.ClientCmdID) (proto.ResponseWithError, error)

GetResponse looks up a response matching the specified cmdID. If the response is found, it is returned along with its associated error. If the response is not found, nil is returned for both the response and its error. In all cases, the third return value is the error returned from the engine when reading the on-disk cache.

func (*ResponseCache) PutResponse 

func (rc *ResponseCache) PutResponse(e engine.Engine, cmdID proto.ClientCmdID, replyWithErr proto.ResponseWithError) error

PutResponse writes a response and an error associated with it to the cache for the specified cmdID.

type SplitRangeEvent 

type SplitRangeEvent struct {
	StoreID  proto.StoreID
	Original UpdateRangeEvent
	New      RegisterRangeEvent
}

SplitRangeEvent occurs whenever a range is split in two. This Event actually contains two other events: an UpdateRangeEvent for the Range which originally existed, and a RegisterRangeEvent for the range created via the split.

type StartStoreEvent 

type StartStoreEvent struct {
	StoreID   proto.StoreID
	StartedAt int64
}

StartStoreEvent occurs whenever a store is initially started.

type Store 

type Store struct {
	Ident proto.StoreIdent
	// contains filtered or unexported fields
}

A Store maintains a map of ranges by start key. A Store corresponds to one physical device.

func NewStore 

func NewStore(ctx StoreContext, eng engine.Engine, nodeDesc *proto.NodeDescriptor) *Store

NewStore returns a new instance of a store.

func (*Store) AddReplicaTest 

func (s *Store) AddReplicaTest(rng *Replica) error

AddReplicaTest adds the replica to the store's replica map and to the sorted replicasByKey slice. To be used only by unittests.

func (*Store) AppliedIndex 

func (s *Store) AppliedIndex(groupID proto.RangeID) (uint64, error)

AppliedIndex implements the multiraft.StateMachine interface.

func (*Store) Attrs 

func (s *Store) Attrs() proto.Attributes

Attrs returns the attributes of the underlying store.

func (*Store) Bootstrap 

func (s *Store) Bootstrap(ident proto.StoreIdent, stopper *stop.Stopper) error

Bootstrap writes a new store ident to the underlying engine. To ensure that no crufty data already exists in the engine, it scans the engine contents before writing the new store ident. The engine should be completely empty. It returns an error if called on a non-empty engine.

func (*Store) BootstrapRange 

func (s *Store) BootstrapRange(initialValues []proto.KeyValue) error

BootstrapRange creates the first range in the cluster and manually writes it to the store. Default range addressing records are created for meta1 and meta2. Default configurations for zones are created. All configs are specified for the empty key prefix, meaning they apply to the entire database. The zone requires three replicas with no other specifications. It also adds the range tree and the root node, the first range, to it. The 'initialValues' are written as well after each value's checksum is initalized.

func (*Store) Capacity 

func (s *Store) Capacity() (proto.StoreCapacity, error)

Capacity returns the capacity of the underlying storage engine.

func (*Store) Clock 

func (s *Store) Clock() *hlc.Clock

Clock accessor.

func (*Store) ClusterID 

func (s *Store) ClusterID() string

ClusterID accessor.

func (*Store) Context 

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

Context returns a base context to pass along with commands being executed, derived from the supplied context (which is allowed to be nil).

func (*Store) DB 

func (s *Store) DB() *client.DB

DB accessor.

func (*Store) Descriptor 

func (s *Store) Descriptor() (*proto.StoreDescriptor, error)

Descriptor returns a StoreDescriptor including current store capacity information.

func (*Store) DisableRangeGCQueue 

func (s *Store) DisableRangeGCQueue(disabled bool)

DisableRangeGCQueue disables or enables the range GC queue. Exposed only for testing.

func (*Store) Engine 

func (s *Store) Engine() engine.Engine

Engine accessor.

func (*Store) EventFeed 

func (s *Store) EventFeed() StoreEventFeed

EventFeed accessor.

func (*Store) ExecuteCmd 

func (s *Store) ExecuteCmd(ctx context.Context, args proto.Request) (proto.Response, error)

ExecuteCmd fetches a range based on the header's replica, assembles method, args & reply into a Raft Cmd struct and executes the command using the fetched range.

func (*Store) ForceRangeGCScan 

func (s *Store) ForceRangeGCScan(t util.Tester)

ForceRangeGCScan iterates over all ranges and enqueues any that may need to be GC'd. Exposed only for testing.

func (*Store) ForceReplicationScan 

func (s *Store) ForceReplicationScan(t util.Tester)

ForceReplicationScan iterates over all ranges and enqueues any that need to be replicated. Exposed only for testing.

func (*Store) GetReplica 

func (s *Store) GetReplica(rangeID proto.RangeID) (*Replica, error)

GetReplica fetches a replica by Range ID. Returns an error if no replica is found.

func (*Store) GetStatus 

func (s *Store) GetStatus() (*StoreStatus, error)

GetStatus fetches the latest store status from the stored value on the cluster. Returns nil if the scanner has not yet run. The scanner runs once every ctx.ScanInterval.

func (*Store) Gossip 

func (s *Store) Gossip() *gossip.Gossip

Gossip accessor.

func (*Store) GossipStore 

func (s *Store) GossipStore()

GossipStore broadcasts the store on the gossip network.

func (*Store) GroupStorage 

func (s *Store) GroupStorage(groupID proto.RangeID) multiraft.WriteableGroupStorage

GroupStorage implements the multiraft.Storage interface.

func (*Store) IsStarted 

func (s *Store) IsStarted() bool

IsStarted returns true if the Store has been started.

func (*Store) LookupReplica 

func (s *Store) LookupReplica(start, end proto.Key) *Replica

LookupReplica looks up a replica via binary search over the "replicasByKey" btree. Returns nil if no replica is found for specified key range. Note that the specified keys are transformed using Key.Address() to ensure we lookup replicas correctly for local keys. When end is nil, a replica that contains start is looked up.

func (*Store) MergeRange 

func (s *Store) MergeRange(subsumingRng *Replica, updatedEndKey proto.Key, subsumedRangeID proto.RangeID) error

MergeRange expands the subsuming range to absorb the subsumed range. This merge operation will fail if the two ranges are not collocated on the same store. Must be called from the processRaft goroutine.

func (*Store) NewRangeDescriptor 

func (s *Store) NewRangeDescriptor(start, end proto.Key, replicas []proto.Replica) (*proto.RangeDescriptor, error)

NewRangeDescriptor creates a new descriptor based on start and end keys and the supplied proto.Replicas slice. It allocates new replica IDs to fill out the supplied replicas.

func (*Store) NewSnapshot 

func (s *Store) NewSnapshot() engine.Engine

NewSnapshot creates a new snapshot engine.

func (*Store) ProposeRaftCommand 

func (s *Store) ProposeRaftCommand(idKey cmdIDKey, cmd proto.RaftCommand) <-chan error

ProposeRaftCommand submits a command to raft. The command is processed asynchronously and an error or nil will be written to the returned channel when it is committed or aborted (but note that committed does mean that it has been applied to the range yet).

func (*Store) PublishStatus 

func (s *Store) PublishStatus() error

PublishStatus publishes periodically computed status events to the store's events feed. This method itself should be periodically called by some external mechanism.

func (*Store) RaftNodeID 

func (s *Store) RaftNodeID() proto.RaftNodeID

RaftNodeID accessor.

func (*Store) RaftStatus 

func (s *Store) RaftStatus(rangeID proto.RangeID) *raft.Status

RaftStatus returns the current raft status of the given range.

func (*Store) RemoveReplica 

func (s *Store) RemoveReplica(rep *Replica) error

RemoveReplica removes the replica from the store's replica map and from the sorted replicasByKey btree.

func (*Store) ReplicaCount 

func (s *Store) ReplicaCount() int

ReplicaCount returns the number of replicas contained by this store.

func (*Store) SetRangeRetryOptions 

func (s *Store) SetRangeRetryOptions(ro retry.Options)

SetRangeRetryOptions sets the retry options used for this store. For unittests only.

func (*Store) SplitRange 

func (s *Store) SplitRange(origRng, newRng *Replica) error

SplitRange shortens the original range to accommodate the new range. The new range is added to the ranges map and the rangesByKey btree.

func (*Store) Start 

func (s *Store) Start(stopper *stop.Stopper) error

Start the engine, set the GC and read the StoreIdent.

func (*Store) StartedAt 

func (s *Store) StartedAt() int64

StartedAt returns the timestamp at which the store was most recently started.

func (*Store) Stopper 

func (s *Store) Stopper() *stop.Stopper

Stopper accessor.

func (*Store) StoreID 

func (s *Store) StoreID() proto.StoreID

StoreID accessor.

func (*Store) String 

func (s *Store) String() string

String formats a store for debug output.

func (*Store) Tracer 

func (s *Store) Tracer() *tracer.Tracer

Tracer accessor.

func (*Store) WaitForInit 

func (s *Store) WaitForInit()

WaitForInit waits for any asynchronous processes begun in Start() to complete their initialization. In particular, this includes gossiping. In some cases this may block until the range GC queue has completed its scan. Only for testing.

type StoreContext 

type StoreContext struct {
	Clock     *hlc.Clock
	DB        *client.DB
	Gossip    *gossip.Gossip
	StorePool *StorePool
	Transport multiraft.Transport

	// RangeRetryOptions are the retry options when retryable errors are
	// encountered sending commands to ranges.
	RangeRetryOptions retry.Options

	// RaftTickInterval is the resolution of the Raft timer; other raft timeouts
	// are defined in terms of multiples of this value.
	RaftTickInterval time.Duration

	// RaftHeartbeatIntervalTicks is the number of ticks that pass between heartbeats.
	RaftHeartbeatIntervalTicks int

	// RaftElectionTimeoutTicks is the number of ticks that must pass before a follower
	// considers a leader to have failed and calls a new election. Should be significantly
	// higher than RaftHeartbeatIntervalTicks. The raft paper recommends a value of 150ms
	// for local networks.
	RaftElectionTimeoutTicks int

	// ScanInterval is the default value for the scan interval
	ScanInterval time.Duration

	// ScanMaxIdleTime is the maximum time the scanner will be idle between ranges.
	// If enabled (> 0), the scanner may complete in less than ScanInterval for small
	// stores.
	ScanMaxIdleTime time.Duration

	// TimeUntilStoreDead is the time after which if there is no new gossiped
	// information about a store, it can be considered dead.
	TimeUntilStoreDead time.Duration

	// EventFeed is a feed to which this store will publish events.
	EventFeed *util.Feed

	// Tracer is a request tracer.
	Tracer *tracer.Tracer
}

A StoreContext encompasses the auxiliary objects and configuration required to create a store. All fields holding a pointer or an interface are required to create a store; the rest will have sane defaults set if omitted.

func (*StoreContext) Valid 

func (sc *StoreContext) Valid() bool

Valid returns true if the StoreContext is populated correctly. We don't check for Gossip and DB since some of our tests pass that as nil.

type StoreEventFeed 

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

StoreEventFeed is a helper structure which publishes store-specific events to a util.Feed. The target feed may be shared by multiple StoreEventFeeds. If the target feed is nil, event methods become no-ops.

func NewStoreEventFeed 

func NewStoreEventFeed(id proto.StoreID, feed *util.Feed) StoreEventFeed

NewStoreEventFeed creates a new StoreEventFeed which publishes events for a specific store to the supplied feed.

type StoreEventListener 

type StoreEventListener interface {
	OnRegisterRange(event *RegisterRangeEvent)
	OnUpdateRange(event *UpdateRangeEvent)
	OnRemoveRange(event *RemoveRangeEvent)
	OnSplitRange(event *SplitRangeEvent)
	OnMergeRange(event *MergeRangeEvent)
	OnStartStore(event *StartStoreEvent)
	OnBeginScanRanges(event *BeginScanRangesEvent)
	OnEndScanRanges(event *EndScanRangesEvent)
	OnStoreStatus(event *StoreStatusEvent)
	OnReplicationStatus(event *ReplicationStatusEvent)
}

StoreEventListener is an interface that can be implemented by objects which listen for events published by stores.

type StoreList 

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

StoreList holds a list of store descriptors and associated count and used stats for those stores.

type StorePool 

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

StorePool maintains a list of all known stores in the cluster and information on their health.

func NewStorePool 

func NewStorePool(g *gossip.Gossip, timeUntilStoreDead time.Duration, stopper *stop.Stopper) *StorePool

NewStorePool creates a StorePool and registers the store updating callback with gossip.

type StoreStatus 

type StoreStatus struct {
	Desc                 cockroach_proto.StoreDescriptor               `protobuf:"bytes,1,opt,name=desc" json:"desc"`
	NodeID               github_com_cockroachdb_cockroach_proto.NodeID `protobuf:"varint,2,opt,name=node_id,casttype=github.com/cockroachdb/cockroach/proto.NodeID" json:"node_id"`
	RangeCount           int32                                         `protobuf:"varint,3,opt,name=range_count" json:"range_count"`
	StartedAt            int64                                         `protobuf:"varint,4,opt,name=started_at" json:"started_at"`
	UpdatedAt            int64                                         `protobuf:"varint,5,opt,name=updated_at" json:"updated_at"`
	Stats                cockroach_storage_engine.MVCCStats            `protobuf:"bytes,6,opt,name=stats" json:"stats"`
	LeaderRangeCount     int32                                         `protobuf:"varint,7,opt,name=leader_range_count" json:"leader_range_count"`
	ReplicatedRangeCount int32                                         `protobuf:"varint,8,opt,name=replicated_range_count" json:"replicated_range_count"`
	AvailableRangeCount  int32                                         `protobuf:"varint,9,opt,name=available_range_count" json:"available_range_count"`
}

StoreStatus contains the stats needed to calculate the current status of a store.

func (*StoreStatus) GetAvailableRangeCount 

func (m *StoreStatus) GetAvailableRangeCount() int32

func (*StoreStatus) GetDesc 

func (m *StoreStatus) GetDesc() cockroach_proto.StoreDescriptor

func (*StoreStatus) GetLeaderRangeCount 

func (m *StoreStatus) GetLeaderRangeCount() int32

func (*StoreStatus) GetNodeID 

func (m *StoreStatus) GetNodeID() github_com_cockroachdb_cockroach_proto.NodeID

func (*StoreStatus) GetRangeCount 

func (m *StoreStatus) GetRangeCount() int32

func (*StoreStatus) GetReplicatedRangeCount 

func (m *StoreStatus) GetReplicatedRangeCount() int32

func (*StoreStatus) GetStartedAt 

func (m *StoreStatus) GetStartedAt() int64

func (*StoreStatus) GetStats 

func (m *StoreStatus) GetStats() cockroach_storage_engine.MVCCStats

func (*StoreStatus) GetUpdatedAt 

func (m *StoreStatus) GetUpdatedAt() int64

func (*StoreStatus) Marshal 

func (m *StoreStatus) Marshal() (data []byte, err error)

func (*StoreStatus) MarshalTo 

func (m *StoreStatus) MarshalTo(data []byte) (int, error)

func (*StoreStatus) ProtoMessage 

func (*StoreStatus) ProtoMessage()

func (*StoreStatus) Reset 

func (m *StoreStatus) Reset()

func (*StoreStatus) Size 

func (m *StoreStatus) Size() (n int)

func (*StoreStatus) String 

func (m *StoreStatus) String() string

func (*StoreStatus) Unmarshal 

func (m *StoreStatus) Unmarshal(data []byte) error

type StoreStatusEvent 

type StoreStatusEvent struct {
	Desc *proto.StoreDescriptor
}

StoreStatusEvent contains the current descriptor for the given store.

Because the descriptor contains information that cannot currently be computed from other events, this event should be periodically broadcast by the store independently of other operations.

type TimestampCache 

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

A TimestampCache maintains an interval tree FIFO cache of keys or key ranges and the timestamps at which they were most recently read or written. If a timestamp was read or written by a transaction, the txn ID is stored with the timestamp to avoid advancing timestamps on successive requests from the same transaction.

The cache also maintains a low-water mark which is the most recently evicted entry's timestamp. This value always ratchets with monotonic increases. The low water mark is initialized to the current system time plus the maximum clock offset.

func NewTimestampCache 

func NewTimestampCache(clock *hlc.Clock) *TimestampCache

NewTimestampCache returns a new timestamp cache with supplied hybrid clock.

func (*TimestampCache) Add 

func (tc *TimestampCache) Add(start, end proto.Key, timestamp proto.Timestamp, txnID []byte, readOnly bool)

Add the specified timestamp to the cache as covering the range of keys from start to end. If end is nil, the range covers the start key only. txnID is nil for no transaction. readOnly specifies whether the command adding this timestamp was read-only or not.

func (*TimestampCache) Clear 

func (tc *TimestampCache) Clear(clock *hlc.Clock)

Clear clears the cache and resets the low water mark to the current time plus the maximum clock offset.

func (*TimestampCache) GetMax 

func (tc *TimestampCache) GetMax(start, end proto.Key, txnID []byte) (proto.Timestamp, proto.Timestamp)

GetMax returns the maximum read and write timestamps which overlap the interval spanning from start to end. Cached timestamps matching the specified txnID are not considered. If no part of the specified range is overlapped by timestamps in the cache, the low water timestamp is returned for both read and write timestamps.

The txn ID prevents restarts with a pattern like: read("a"), write("a"). The read adds a timestamp for "a". Then the write (for the same transaction) would get that as the max timestamp and be forced to increment it. This allows timestamps from the same txn to be ignored.

func (*TimestampCache) MergeInto 

func (tc *TimestampCache) MergeInto(dest *TimestampCache, clear bool)

MergeInto merges all entries from this timestamp cache into the dest timestamp cache. The clear parameter, if true, copies the values of lowWater and latest and clears the destination cache before merging in the source.

func (*TimestampCache) SetLowWater 

func (tc *TimestampCache) SetLowWater(lowWater proto.Timestamp)

SetLowWater sets the cache's low water mark, which is the minimum value the cache will return from calls to GetMax().

type UpdateRangeEvent 

type UpdateRangeEvent struct {
	StoreID proto.StoreID
	Desc    *proto.RangeDescriptor
	Stats   engine.MVCCStats
	Method  proto.Method
	Delta   engine.MVCCStats
}

UpdateRangeEvent occurs whenever a Range is modified. This structure includes the basic range information, but also includes a second set of MVCCStats containing the delta from the Range's previous stats. If the update did not modify any statistics, this delta may be nil.

Source Files

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Directories

Path Synopsis
Package engine provides low-level storage.
 Package engine provides low-level storage.
rocksdb

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