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foundationdb/fdbclient/SystemData.h

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/*
* SystemData.h
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FDBCLIENT_SYSTEMDATA_H
#define FDBCLIENT_SYSTEMDATA_H
#pragma once
// Functions and constants documenting the organization of the reserved keyspace in the database beginning with "\xFF"
#include "fdbclient/FDBTypes.h"
#include "fdbclient/StorageServerInterface.h"
// Don't warn on constants being defined in this file.
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-variable"
struct RestoreLoaderInterface;
struct RestoreApplierInterface;
struct RestoreMasterInterface;
extern const KeyRangeRef normalKeys; // '' to systemKeys.begin
extern const KeyRangeRef systemKeys; // [FF] to [FF][FF]
extern const KeyRangeRef nonMetadataSystemKeys; // [FF][00] to [FF][01]
extern const KeyRangeRef allKeys; // '' to systemKeys.end
extern const KeyRangeRef specialKeys; // [FF][FF] to [FF][FF][FF], some client functions are exposed through FDB calls
// using these special keys, see pr#2662
extern const KeyRef afterAllKeys;
// "\xff/keyServers/[[begin]]" := "[[vector<serverID>, std::vector<serverID>]|[vector<Tag>, std::vector<Tag>]]"
// An internal mapping of where shards are located in the database. [[begin]] is the start of the shard range
// and the result is a list of serverIDs or Tags where these shards are located. These values can be changed
// as data movement occurs.
extern const KeyRangeRef keyServersKeys, keyServersKeyServersKeys;
extern const KeyRef keyServersPrefix, keyServersEnd, keyServersKeyServersKey;
const Key keyServersKey(const KeyRef& k);
const KeyRef keyServersKey(const KeyRef& k, Arena& arena);
const Value keyServersValue(RangeResult result,
const std::vector<UID>& src,
const std::vector<UID>& dest = std::vector<UID>());
const Value keyServersValue(const std::vector<Tag>& srcTag, const std::vector<Tag>& destTag = std::vector<Tag>());
// `result` must be the full result of getting serverTagKeys
void decodeKeyServersValue(RangeResult result,
const ValueRef& value,
std::vector<UID>& src,
std::vector<UID>& dest,
bool missingIsError = true);
void decodeKeyServersValue(std::map<Tag, UID> const& tag_uid,
const ValueRef& value,
std::vector<UID>& src,
std::vector<UID>& dest);
// "\xff/storageCacheServer/[[UID]] := StorageServerInterface"
// This will be added by the cache server on initialization and removed by DD
// TODO[mpilman]: We will need a way to map uint16_t ids to UIDs in a future
// versions. For now caches simply cache everything so the ids
// are not yet meaningful.
extern const KeyRangeRef storageCacheServerKeys;
extern const KeyRef storageCacheServersPrefix, storageCacheServersEnd;
const Key storageCacheServerKey(UID id);
const Value storageCacheServerValue(const StorageServerInterface& ssi);
// "\xff/storageCache/[[begin]]" := "[[vector<uint16_t>]]"
extern const KeyRangeRef storageCacheKeys;
extern const KeyRef storageCachePrefix;
const Key storageCacheKey(const KeyRef& k);
const Value storageCacheValue(const std::vector<uint16_t>& serverIndices);
void decodeStorageCacheValue(const ValueRef& value, std::vector<uint16_t>& serverIndices);
// "\xff/serverKeys/[[serverID]]/[[begin]]" := "[[serverKeysTrue]]" |" [[serverKeysFalse]]"
// An internal mapping of what shards any given server currently has ownership of
// Using the serverID as a prefix, then followed by the beginning of the shard range
// as the key, the value indicates whether the shard does or does not exist on the server.
// These values can be changed as data movement occurs.
extern const KeyRef serverKeysPrefix;
extern const ValueRef serverKeysTrue, serverKeysTrueEmptyRange, serverKeysFalse;
const Key serverKeysKey(UID serverID, const KeyRef& keys);
const Key serverKeysPrefixFor(UID serverID);
UID serverKeysDecodeServer(const KeyRef& key);
bool serverHasKey(ValueRef storedValue);
extern const KeyRangeRef conflictingKeysRange;
extern const ValueRef conflictingKeysTrue, conflictingKeysFalse;
extern const KeyRangeRef writeConflictRangeKeysRange;
extern const KeyRangeRef readConflictRangeKeysRange;
extern const KeyRangeRef ddStatsRange;
extern const KeyRef cacheKeysPrefix;
const Key cacheKeysKey(uint16_t idx, const KeyRef& key);
const Key cacheKeysPrefixFor(uint16_t idx);
uint16_t cacheKeysDecodeIndex(const KeyRef& key);
KeyRef cacheKeysDecodeKey(const KeyRef& key);
extern const KeyRef cacheChangeKey;
extern const KeyRangeRef cacheChangeKeys;
extern const KeyRef cacheChangePrefix;
const Key cacheChangeKeyFor(uint16_t idx);
uint16_t cacheChangeKeyDecodeIndex(const KeyRef& key);
// "\xff/tss/[[serverId]]" := "[[tssId]]"
extern const KeyRangeRef tssMappingKeys;
// "\xff/tssQ/[[serverId]]" := ""
// For quarantining a misbehaving TSS.
extern const KeyRangeRef tssQuarantineKeys;
const Key tssQuarantineKeyFor(UID serverID);
UID decodeTssQuarantineKey(KeyRef const&);
// \xff/tssMismatch/[[Tuple<TSSStorageUID, timestamp, mismatchUID>]] := [[TraceEventString]]
// For recording tss mismatch details in the system keyspace
extern const KeyRangeRef tssMismatchKeys;
// "\xff/serverTag/[[serverID]]" = "[[Tag]]"
// Provides the Tag for the given serverID. Used to access a
// storage server's corresponding TLog in order to apply mutations.
extern const KeyRangeRef serverTagKeys;
extern const KeyRef serverTagPrefix;
extern const KeyRangeRef serverTagMaxKeys;
extern const KeyRangeRef serverTagConflictKeys;
extern const KeyRef serverTagConflictPrefix;
extern const KeyRangeRef serverTagHistoryKeys;
extern const KeyRef serverTagHistoryPrefix;
const Key serverTagKeyFor(UID serverID);
const Key serverTagHistoryKeyFor(UID serverID);
const KeyRange serverTagHistoryRangeFor(UID serverID);
const KeyRange serverTagHistoryRangeBefore(UID serverID, Version version);
const Value serverTagValue(Tag);
UID decodeServerTagKey(KeyRef const&);
Version decodeServerTagHistoryKey(KeyRef const&);
Tag decodeServerTagValue(ValueRef const&);
const Key serverTagConflictKeyFor(Tag);
// "\xff/tagLocalityList/[[datacenterID]]" := "[[tagLocality]]"
// Provides the tagLocality for the given datacenterID
// See "FDBTypes.h" struct Tag for more details on tagLocality
extern const KeyRangeRef tagLocalityListKeys;
extern const KeyRef tagLocalityListPrefix;
const Key tagLocalityListKeyFor(Optional<Value> dcID);
const Value tagLocalityListValue(int8_t const&);
Optional<Value> decodeTagLocalityListKey(KeyRef const&);
int8_t decodeTagLocalityListValue(ValueRef const&);
// "\xff\x02/datacenterReplicas/[[datacenterID]]" := "[[replicas]]"
// Provides the number of replicas for the given datacenterID.
// Used in the initialization of the Data Distributor.
extern const KeyRangeRef datacenterReplicasKeys;
extern const KeyRef datacenterReplicasPrefix;
const Key datacenterReplicasKeyFor(Optional<Value> dcID);
const Value datacenterReplicasValue(int const&);
Optional<Value> decodeDatacenterReplicasKey(KeyRef const&);
int decodeDatacenterReplicasValue(ValueRef const&);
// "\xff\x02/tLogDatacenters/[[datacenterID]]"
// The existence of an empty string as a value signifies that the datacenterID is valid
// (as opposed to having no value at all)
extern const KeyRangeRef tLogDatacentersKeys;
extern const KeyRef tLogDatacentersPrefix;
const Key tLogDatacentersKeyFor(Optional<Value> dcID);
Optional<Value> decodeTLogDatacentersKey(KeyRef const&);
extern const KeyRef primaryDatacenterKey;
// "\xff/serverList/[[serverID]]" := "[[StorageServerInterface]]"
// Storage servers are listed here when they are recruited - always before assigning them keys
// Storage servers removed from here are never replaced. The same fdbserver, if re-recruited, will always
// have a new ID. When removed from here, a storage server may release all resources and destroy itself.
extern const KeyRangeRef serverListKeys;
extern const KeyRef serverListPrefix;
const Key serverListKeyFor(UID serverID);
const Value serverListValue(StorageServerInterface const&);
UID decodeServerListKey(KeyRef const&);
StorageServerInterface decodeServerListValue(ValueRef const&);
// "\xff/processClass/[[processID]]" := "[[ProcessClass]]"
// Contains a mapping from processID to processClass
extern const KeyRangeRef processClassKeys;
extern const KeyRef processClassPrefix;
extern const KeyRef processClassChangeKey;
extern const KeyRef processClassVersionKey;
extern const ValueRef processClassVersionValue;
const Key processClassKeyFor(StringRef processID);
const Value processClassValue(ProcessClass const&);
Key decodeProcessClassKey(KeyRef const&);
ProcessClass decodeProcessClassValue(ValueRef const&);
UID decodeProcessClassKeyOld(KeyRef const& key);
// "\xff/conf/[[option]]" := "value"
// An umbrella prefix for options mostly used by the DatabaseConfiguration class.
// See DatabaseConfiguration.cpp ::setInternal for more examples.
extern const KeyRangeRef configKeys;
extern const KeyRef configKeysPrefix;
extern const KeyRef perpetualStorageWiggleKey;
extern const KeyRef perpetualStorageWiggleLocalityKey;
extern const KeyRef wigglingStorageServerKey;
// Change the value of this key to anything and that will trigger detailed data distribution team info log.
extern const KeyRef triggerDDTeamInfoPrintKey;
// The differences between excluded and failed can be found in "command-line-interface.rst"
// and in the help message of the fdbcli command "exclude".
// "\xff/conf/excluded/1.2.3.4" := ""
// "\xff/conf/excluded/1.2.3.4:4000" := ""
// These are inside configKeysPrefix since they represent a form of configuration and they are convenient
// to track in the same way by the tlog and recovery process, but they are ignored by the DatabaseConfiguration
// class.
// The existence of an empty string as a value signifies that the provided IP has been excluded.
// (as opposed to having no value at all)
extern const KeyRef excludedServersPrefix;
extern const KeyRangeRef excludedServersKeys;
extern const KeyRef excludedServersVersionKey; // The value of this key shall be changed by any transaction that
// modifies the excluded servers list
AddressExclusion decodeExcludedServersKey(KeyRef const& key); // where key.startsWith(excludedServersPrefix)
std::string encodeExcludedServersKey(AddressExclusion const&);
extern const KeyRef excludedLocalityPrefix;
extern const KeyRangeRef excludedLocalityKeys;
extern const KeyRef excludedLocalityVersionKey; // The value of this key shall be changed by any transaction that
// modifies the excluded localities list
std::string decodeExcludedLocalityKey(KeyRef const& key); // where key.startsWith(excludedLocalityPrefix)
std::string encodeExcludedLocalityKey(std::string const&);
// "\xff/conf/failed/1.2.3.4" := ""
// "\xff/conf/failed/1.2.3.4:4000" := ""
// These are inside configKeysPrefix since they represent a form of configuration and they are convenient
// to track in the same way by the tlog and recovery process, but they are ignored by the DatabaseConfiguration
// class.
// The existence of an empty string as a value signifies that the provided IP has been marked as failed.
// (as opposed to having no value at all)
extern const KeyRef failedServersPrefix;
extern const KeyRangeRef failedServersKeys;
extern const KeyRef failedServersVersionKey; // The value of this key shall be changed by any transaction that modifies
// the failed servers list
AddressExclusion decodeFailedServersKey(KeyRef const& key); // where key.startsWith(failedServersPrefix)
std::string encodeFailedServersKey(AddressExclusion const&);
extern const KeyRef failedLocalityPrefix;
extern const KeyRangeRef failedLocalityKeys;
extern const KeyRef failedLocalityVersionKey; // The value of this key shall be changed by any transaction that modifies
// the failed localities list
std::string decodeFailedLocalityKey(KeyRef const& key); // where key.startsWith(failedLocalityPrefix)
std::string encodeFailedLocalityKey(std::string const&);
// "\xff/globalConfig/[[option]]" := "value"
// An umbrella prefix for global configuration data synchronized to all nodes.
// extern const KeyRangeRef globalConfigData;
// extern const KeyRef globalConfigDataPrefix;
// "\xff/globalConfig/k/[[key]]" := "value"
// Key-value pairs that have been set. The range this keyspace represents
// contains all globally configured options.
extern const KeyRangeRef globalConfigDataKeys;
extern const KeyRef globalConfigKeysPrefix;
// "\xff/globalConfig/h/[[version]]" := "value"
// Maps a commit version to a list of mutations made to the global
// configuration at that commit. Shipped to nodes periodically. In general,
// clients should not write to keys in this keyspace; it will be written
// automatically when updating global configuration keys.
extern const KeyRangeRef globalConfigHistoryKeys;
extern const KeyRef globalConfigHistoryPrefix;
// "\xff/globalConfig/v" := "version"
// Read-only key which returns the commit version of the most recent mutation
// made to the global configuration keyspace.
extern const KeyRef globalConfigVersionKey;
// "\xff/workers/[[processID]]" := ""
// Asynchronously updated by the cluster controller, this is a list of fdbserver processes that have joined the cluster
// and are currently (recently) available
extern const KeyRangeRef workerListKeys;
extern const KeyRef workerListPrefix;
const Key workerListKeyFor(StringRef processID);
const Value workerListValue(ProcessData const&);
Key decodeWorkerListKey(KeyRef const&);
ProcessData decodeWorkerListValue(ValueRef const&);
// "\xff\x02/backupProgress/[[workerID]]" := "[[WorkerBackupStatus]]"
// Provides the progress for the given backup worker.
// See "FDBTypes.h" struct WorkerBackupStatus for more details on the return type value.
extern const KeyRangeRef backupProgressKeys;
extern const KeyRef backupProgressPrefix;
const Key backupProgressKeyFor(UID workerID);
const Value backupProgressValue(const WorkerBackupStatus& status);
UID decodeBackupProgressKey(const KeyRef& key);
WorkerBackupStatus decodeBackupProgressValue(const ValueRef& value);
// The key to signal backup workers a new backup job is submitted.
// "\xff\x02/backupStarted" := "[[vector<UID,Version1>]]"
extern const KeyRef backupStartedKey;
Value encodeBackupStartedValue(const std::vector<std::pair<UID, Version>>& ids);
std::vector<std::pair<UID, Version>> decodeBackupStartedValue(const ValueRef& value);
// The key to signal backup workers that they should resume or pause.
// "\xff\x02/backupPaused" := "[[0|1]]"
// 0 = Send a signal to resume/already resumed.
// 1 = Send a signal to pause/already paused.
extern const KeyRef backupPausedKey;
// "\xff/coordinators" = "[[ClusterConnectionString]]"
// Set to the encoded structure of the cluster's current set of coordinators.
// Changed when performing quorumChange.
// See "CoordinationInterface.h" struct ClusterConnectionString for more details
extern const KeyRef coordinatorsKey;
// "\xff/logs" = "[[LogsValue]]"
// Used during master recovery in order to communicate
// and store info about the logs system.
extern const KeyRef logsKey;
// "\xff/minRequiredCommitVersion" = "[[Version]]"
// Used during backup/recovery to restrict version requirements
extern const KeyRef minRequiredCommitVersionKey;
const Value logsValue(const std::vector<std::pair<UID, NetworkAddress>>& logs,
const std::vector<std::pair<UID, NetworkAddress>>& oldLogs);
std::pair<std::vector<std::pair<UID, NetworkAddress>>, std::vector<std::pair<UID, NetworkAddress>>> decodeLogsValue(
const ValueRef& value);
// The "global keys" are sent to each storage server any time they are changed
extern const KeyRef globalKeysPrefix;
extern const KeyRef lastEpochEndKey;
extern const KeyRef lastEpochEndPrivateKey;
extern const KeyRef killStorageKey;
extern const KeyRef killStoragePrivateKey;
extern const KeyRef rebootWhenDurableKey;
extern const KeyRef rebootWhenDurablePrivateKey;
extern const KeyRef primaryLocalityKey;
extern const KeyRef primaryLocalityPrivateKey;
extern const KeyRef fastLoggingEnabled;
extern const KeyRef fastLoggingEnabledPrivateKey;
extern const KeyRef moveKeysLockOwnerKey, moveKeysLockWriteKey;
extern const KeyRef dataDistributionModeKey;
extern const UID dataDistributionModeLock;
// Keys to view and control tag throttling
extern const KeyRangeRef tagThrottleKeys;
extern const KeyRef tagThrottleKeysPrefix;
extern const KeyRef tagThrottleAutoKeysPrefix;
extern const KeyRef tagThrottleSignalKey;
extern const KeyRef tagThrottleAutoEnabledKey;
extern const KeyRef tagThrottleLimitKey;
extern const KeyRef tagThrottleCountKey;
// Log Range constant variables
// Used in the backup pipeline to track mutations
// \xff/logRanges/[16-byte UID][begin key] := serialize( make_pair([end key], [destination key prefix]),
// IncludeVersion() )
extern const KeyRangeRef logRangesRange;
// Returns the encoded key comprised of begin key and log uid
Key logRangesEncodeKey(KeyRef keyBegin, UID logUid);
// Returns the start key and optionally the logRange Uid
KeyRef logRangesDecodeKey(KeyRef key, UID* logUid = nullptr);
// Returns the end key and optionally the key prefix
Key logRangesDecodeValue(KeyRef keyValue, Key* destKeyPrefix = nullptr);
// Returns the encoded key value comprised of the end key and destination prefix
Key logRangesEncodeValue(KeyRef keyEnd, KeyRef destPath);
// Returns a key prefixed with the specified key with
// the given uid encoded at the end
Key uidPrefixKey(KeyRef keyPrefix, UID logUid);
/// Apply mutations constant variables
// applyMutationsEndRange.end defines the highest version for which we have mutations that we can
// apply to our database as part of a DR/restore operation.
// \xff/applyMutationsEnd/[16-byte UID] := serialize( endVersion, Unversioned() )
extern const KeyRangeRef applyMutationsEndRange;
// applyMutationsBeginRange.begin defines the highest version of what has already been applied by a
// DR/restore to the database, and thus also what version is of the next mutation that needs to be
// applied to the database.
// \xff/applyMutationsBegin/[16-byte UID] := serialize( beginVersion, Unversioned() )
extern const KeyRangeRef applyMutationsBeginRange;
// \xff/applyMutationsAddPrefix/[16-byte UID] := addPrefix
extern const KeyRangeRef applyMutationsAddPrefixRange;
// \xff/applyMutationsRemovePrefix/[16-byte UID] := removePrefix
extern const KeyRangeRef applyMutationsRemovePrefixRange;
extern const KeyRangeRef applyMutationsKeyVersionMapRange;
extern const KeyRangeRef applyMutationsKeyVersionCountRange;
// FdbClient Info prefix
extern const KeyRangeRef fdbClientInfoPrefixRange;
// Consistency Check settings
extern const KeyRef fdbShouldConsistencyCheckBeSuspended;
// Request latency measurement key
extern const KeyRef latencyBandConfigKey;
// Keyspace to maintain wall clock to version map
extern const KeyRangeRef timeKeeperPrefixRange;
extern const KeyRef timeKeeperVersionKey;
extern const KeyRef timeKeeperDisableKey;
// Layer status metadata prefix
extern const KeyRangeRef layerStatusMetaPrefixRange;
// Backup agent status root
extern const KeyRangeRef backupStatusPrefixRange;
// Key range reserved by file backup agent to storing configuration and state information
extern const KeyRangeRef fileBackupPrefixRange;
// Key range reserved by file restore agent (currently part of backup agent functionally separate) for storing
// configuration and state information
extern const KeyRangeRef fileRestorePrefixRange;
// Key range reserved by database backup agent to storing configuration and state information
extern const KeyRangeRef databaseBackupPrefixRange;
extern const KeyRef destUidLookupPrefix;
extern const KeyRef backupLatestVersionsPrefix;
// Key range reserved by backup agent to storing mutations
extern const KeyRangeRef backupLogKeys;
extern const KeyRangeRef applyLogKeys;
extern const KeyRef backupVersionKey;
extern const ValueRef backupVersionValue;
extern const int backupVersion;
static const int backupLogPrefixBytes = 8;
// Use for legacy system support (pre 300)
extern const KeyRef backupEnabledKey;
extern const KeyRef systemTuplesPrefix;
extern const KeyRef metricConfChangeKey;
extern const KeyRangeRef metricConfKeys;
extern const KeyRef metricConfPrefix;
// const Key metricConfKey( KeyRef const& prefix, struct MetricNameRef const& name, KeyRef const& key );
// std::pair<struct MetricNameRef, KeyRef> decodeMetricConfKey( KeyRef const& prefix, KeyRef const& key );
extern const KeyRef maxUIDKey;
extern const KeyRef databaseLockedKey;
extern const KeyRef databaseLockedKeyEnd;
extern const KeyRef metadataVersionKey;
extern const KeyRef metadataVersionKeyEnd;
extern const KeyRef metadataVersionRequiredValue;
extern const KeyRef mustContainSystemMutationsKey;
// Key range reserved for storing changes to monitor conf files
extern const KeyRangeRef monitorConfKeys;
extern const KeyRef healthyZoneKey;
extern const StringRef ignoreSSFailuresZoneString;
extern const KeyRef rebalanceDDIgnoreKey;
const Value healthyZoneValue(StringRef const& zoneId, Version version);
std::pair<Key, Version> decodeHealthyZoneValue(ValueRef const&);
// All mutations done to this range are blindly copied into txnStateStore.
// Used to create artifically large txnStateStore instances in testing.
extern const KeyRangeRef testOnlyTxnStateStorePrefixRange;
// Snapshot + Incremental Restore
// "\xff/writeRecovery" = "[[writeRecoveryKeyTrue]]"
// Flag used for the snapshot-restore pipeline in order to avoid
// anomalous behaviour with multiple recoveries.
extern const KeyRef writeRecoveryKey;
extern const ValueRef writeRecoveryKeyTrue;
// "\xff/snapshotEndVersion" = "[[Version]]"
// Written by master server during recovery if recovering from a snapshot.
// Allows incremental restore to read and set starting version for consistency.
extern const KeyRef snapshotEndVersionKey;
extern const KeyRangeRef changeFeedKeys;
enum class ChangeFeedStatus { CHANGE_FEED_CREATE = 0, CHANGE_FEED_STOP = 1, CHANGE_FEED_DESTROY = 2 };
const Value changeFeedValue(KeyRangeRef const& range, Version popVersion, ChangeFeedStatus status);
std::tuple<KeyRange, Version, ChangeFeedStatus> decodeChangeFeedValue(ValueRef const& value);
extern const KeyRef changeFeedPrefix;
extern const KeyRef changeFeedPrivatePrefix;
extern const KeyRangeRef changeFeedDurableKeys;
extern const KeyRef changeFeedDurablePrefix;
const Value changeFeedDurableKey(Key const& feed, Version version);
std::pair<Key, Version> decodeChangeFeedDurableKey(ValueRef const& key);
const Value changeFeedDurableValue(Standalone<VectorRef<MutationRef>> const& mutations, Version knownCommittedVersion);
std::pair<Standalone<VectorRef<MutationRef>>, Version> decodeChangeFeedDurableValue(ValueRef const& value);
// Configuration database special keys
extern const KeyRef configTransactionDescriptionKey;
extern const KeyRange globalConfigKnobKeys;
extern const KeyRangeRef configKnobKeys;
extern const KeyRangeRef configClassKeys;
#pragma clang diagnostic pop
#endif
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