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citus/src/include/distributed/metadata_utility.h

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/*-------------------------------------------------------------------------
*
* metadata_utility.h
* Type and function declarations used for reading and modifying
* coordinator node's metadata.
*
* Copyright (c) Citus Data, Inc.
*
* $Id$
*
*-------------------------------------------------------------------------
*/
#ifndef METADATA_UTILITY_H
#define METADATA_UTILITY_H
#include "postgres.h"
#include "access/heapam.h"
#include "access/htup.h"
#include "access/tupdesc.h"
#include "catalog/indexing.h"
#include "catalog/objectaddress.h"
#include "distributed/citus_nodes.h"
#include "distributed/connection_management.h"
#include "distributed/errormessage.h"
#include "distributed/relay_utility.h"
#include "utils/acl.h"
#include "utils/relcache.h"
/* total number of hash tokens (2^32) */
#define HASH_TOKEN_COUNT INT64CONST(4294967296)
#define SELECT_TRUE_QUERY "SELECT TRUE FROM %s LIMIT 1"
#define PG_TABLE_SIZE_FUNCTION "pg_table_size(%s)"
#define PG_RELATION_SIZE_FUNCTION "pg_relation_size(%s)"
#define PG_TOTAL_RELATION_SIZE_FUNCTION "pg_total_relation_size(%s)"
#define WORKER_PARTITIONED_TABLE_SIZE_FUNCTION "worker_partitioned_table_size(%s)"
#define WORKER_PARTITIONED_RELATION_SIZE_FUNCTION "worker_partitioned_relation_size(%s)"
#define WORKER_PARTITIONED_RELATION_TOTAL_SIZE_FUNCTION \
"worker_partitioned_relation_total_size(%s)"
#define SHARD_SIZES_COLUMN_COUNT (3)
/*
* Flag to keep track of whether the process is currently in a function converting the
* type of the table. Since it only affects the level of the log shown while dropping/
* recreating table within the table type conversion, rollbacking to the savepoint hasn't
* been implemented for the sake of simplicity. If you are planning to use that flag for
* any other purpose, please consider implementing that.
*/
extern bool InTableTypeConversionFunctionCall;
/* In-memory representation of a typed tuple in pg_dist_shard. */
typedef struct ShardInterval
{
CitusNode type;
Oid relationId;
char storageType;
Oid valueTypeId; /* min/max value datum's typeId */
int valueTypeLen; /* min/max value datum's typelen */
bool valueByVal; /* min/max value datum's byval */
bool minValueExists;
bool maxValueExists;
Datum minValue; /* a shard's typed min value datum */
Datum maxValue; /* a shard's typed max value datum */
uint64 shardId;
int shardIndex;
} ShardInterval;
/* In-memory representation of a tuple in pg_dist_placement. */
typedef struct GroupShardPlacement
{
CitusNode type;
uint64 placementId; /* sequence that implies this placement creation order */
uint64 shardId;
uint64 shardLength;
ShardState shardState;
int32 groupId;
} GroupShardPlacement;
/* A GroupShardPlacement which has had some extra data resolved */
typedef struct ShardPlacement
{
/*
* careful, the rest of the code assumes this exactly matches GroupShardPlacement
*/
CitusNode type;
uint64 placementId;
uint64 shardId;
uint64 shardLength;
ShardState shardState;
int32 groupId;
/* the rest of the fields aren't from pg_dist_placement */
char *nodeName;
uint32 nodePort;
uint32 nodeId;
char partitionMethod;
uint32 colocationGroupId;
uint32 representativeValue;
} ShardPlacement;
typedef enum CascadeToColocatedOption
{
CASCADE_TO_COLOCATED_UNSPECIFIED,
CASCADE_TO_COLOCATED_YES,
CASCADE_TO_COLOCATED_NO,
CASCADE_TO_COLOCATED_NO_ALREADY_CASCADED
}CascadeToColocatedOption;
/*
* TableConversionParameters are the parameters that are given to
* table conversion UDFs: undistribute_table, alter_distributed_table,
* alter_table_set_access_method.
*
* When passing a TableConversionParameters object to one of the table
* conversion functions some of the parameters needs to be set:
* UndistributeTable: relationId
* AlterDistributedTable: relationId, distributionColumn, shardCountIsNull,
* shardCount, colocateWith, cascadeToColocated
* AlterTableSetAccessMethod: relationId, accessMethod
*
* conversionType parameter will be automatically set by the function.
*
* TableConversionState objects can be created using TableConversionParameters
* objects with CreateTableConversion function.
*/
typedef struct TableConversionParameters
{
/*
* Determines type of conversion: UNDISTRIBUTE_TABLE,
* ALTER_DISTRIBUTED_TABLE, ALTER_TABLE_SET_ACCESS_METHOD.
*/
char conversionType;
/* Oid of the table to do conversion on */
Oid relationId;
/*
* Options to do conversions on the table
* distributionColumn is the name of the new distribution column,
* shardCountIsNull is if the shardCount variable is not given
* shardCount is the new shard count,
* colocateWith is the name of the table to colocate with, 'none', or
* 'default'
* accessMethod is the name of the new accessMethod for the table
*/
char *distributionColumn;
bool shardCountIsNull;
int shardCount;
char *colocateWith;
char *accessMethod;
/*
* cascadeToColocated determines whether the shardCount and
* colocateWith will be cascaded to the currently colocated tables
*/
CascadeToColocatedOption cascadeToColocated;
/*
* cascadeViaForeignKeys determines if the conversion operation
* will be cascaded to the graph connected with foreign keys
* to the table
*/
bool cascadeViaForeignKeys;
/*
* suppressNoticeMessages determines if we want to suppress NOTICE
* messages that we explicitly issue
*/
bool suppressNoticeMessages;
} TableConversionParameters;
typedef struct TableConversionReturn
{
/*
* commands to create foreign keys for the table
*
* When the table conversion is cascaded we can recreate
* some of the foreign keys of the cascaded tables. So with this
* list we can return it to the initial conversion operation so
* foreign keys can be created after every colocated table is
* converted.
*/
List *foreignKeyCommands;
}TableConversionReturn;
/*
* Size query types for PG and Citus
* For difference details, please see:
* https://www.postgresql.org/docs/13/functions-admin.html#FUNCTIONS-ADMIN-DBSIZE
*/
typedef enum SizeQueryType
{
RELATION_SIZE, /* pg_relation_size() */
TOTAL_RELATION_SIZE, /* pg_total_relation_size() */
TABLE_SIZE /* pg_table_size() */
} SizeQueryType;
/* Size functions */
extern Datum citus_table_size(PG_FUNCTION_ARGS);
extern Datum citus_total_relation_size(PG_FUNCTION_ARGS);
extern Datum citus_relation_size(PG_FUNCTION_ARGS);
/* Function declarations to read shard and shard placement data */
extern uint32 TableShardReplicationFactor(Oid relationId);
extern List * LoadShardIntervalList(Oid relationId);
extern List * LoadUnsortedShardIntervalListViaCatalog(Oid relationId);
extern ShardInterval * LoadShardIntervalWithLongestShardName(Oid relationId);
extern int ShardIntervalCount(Oid relationId);
extern List * LoadShardList(Oid relationId);
extern ShardInterval * CopyShardInterval(ShardInterval *srcInterval);
extern uint64 ShardLength(uint64 shardId);
extern bool NodeGroupHasShardPlacements(int32 groupId,
bool onlyConsiderActivePlacements);
extern bool IsActiveShardPlacement(ShardPlacement *ShardPlacement);
extern List * FilterShardPlacementList(List *shardPlacementList, bool (*filter)(
ShardPlacement *));
extern List * ActiveShardPlacementListOnGroup(uint64 shardId, int32 groupId);
extern List * ActiveShardPlacementList(uint64 shardId);
extern List * ShardPlacementListWithoutOrphanedPlacements(uint64 shardId);
extern ShardPlacement * ActiveShardPlacement(uint64 shardId, bool missingOk);
extern List * BuildShardPlacementList(int64 shardId);
extern List * AllShardPlacementsOnNodeGroup(int32 groupId);
extern List * AllShardPlacementsWithShardPlacementState(ShardState shardState);
extern List * GroupShardPlacementsForTableOnGroup(Oid relationId, int32 groupId);
extern StringInfo GenerateSizeQueryOnMultiplePlacements(List *shardIntervalList,
SizeQueryType sizeQueryType,
bool optimizePartitionCalculations);
extern List * RemoveCoordinatorPlacementIfNotSingleNode(List *placementList);
/* Function declarations to modify shard and shard placement data */
extern void InsertShardRow(Oid relationId, uint64 shardId, char storageType,
text *shardMinValue, text *shardMaxValue);
extern void DeleteShardRow(uint64 shardId);
extern uint64 InsertShardPlacementRow(uint64 shardId, uint64 placementId,
char shardState, uint64 shardLength,
int32 groupId);
extern void InsertIntoPgDistPartition(Oid relationId, char distributionMethod,
Var *distributionColumn, uint32 colocationId,
char replicationModel, bool autoConverted);
extern void UpdatePgDistPartitionAutoConverted(Oid citusTableId, bool autoConverted);
extern void DeletePartitionRow(Oid distributedRelationId);
extern void DeleteShardRow(uint64 shardId);
extern void UpdateShardPlacementState(uint64 placementId, char shardState);
extern void UpdatePlacementGroupId(uint64 placementId, int groupId);
extern void DeleteShardPlacementRow(uint64 placementId);
extern void CreateDistributedTable(Oid relationId, char *distributionColumnName,
char distributionMethod, int shardCount,
bool shardCountIsStrict, char *colocateWithTableName,
bool viaDeprecatedAPI);
extern void CreateTruncateTrigger(Oid relationId);
extern TableConversionReturn * UndistributeTable(TableConversionParameters *params);
extern void EnsureDependenciesExistOnAllNodes(const ObjectAddress *target);
extern DeferredErrorMessage * DeferErrorIfCircularDependencyExists(const
ObjectAddress *
objectAddress);
extern List * GetDistributableDependenciesForObject(const ObjectAddress *target);
extern bool ShouldPropagate(void);
extern bool ShouldPropagateCreateInCoordinatedTransction(void);
extern bool ShouldPropagateObject(const ObjectAddress *address);
extern List * ReplicateAllObjectsToNodeCommandList(const char *nodeName, int nodePort);
/* Remaining metadata utility functions */
extern char * TableOwner(Oid relationId);
extern void EnsureTablePermissions(Oid relationId, AclMode mode);
extern void EnsureTableOwner(Oid relationId);
extern void EnsureSchemaOwner(Oid schemaId);
extern void EnsureHashDistributedTable(Oid relationId);
extern void EnsureFunctionOwner(Oid functionId);
extern void EnsureSuperUser(void);
extern void ErrorIfTableIsACatalogTable(Relation relation);
extern void EnsureTableNotDistributed(Oid relationId);
extern void EnsureRelationExists(Oid relationId);
extern bool RegularTable(Oid relationId);
extern bool TableEmpty(Oid tableId);
extern bool IsForeignTable(Oid relationId);
extern bool RelationUsesIdentityColumns(TupleDesc relationDesc);
extern char * ConstructQualifiedShardName(ShardInterval *shardInterval);
extern uint64 GetFirstShardId(Oid relationId);
extern Datum StringToDatum(char *inputString, Oid dataType);
extern char * DatumToString(Datum datum, Oid dataType);
extern int CompareShardPlacementsByWorker(const void *leftElement,
const void *rightElement);
extern int CompareShardPlacementsByGroupId(const void *leftElement,
const void *rightElement);
extern ShardInterval * DeformedDistShardTupleToShardInterval(Datum *datumArray,
bool *isNullArray,
Oid intervalTypeId,
int32 intervalTypeMod);
extern void GetIntervalTypeInfo(char partitionMethod, Var *partitionColumn,
Oid *intervalTypeId, int32 *intervalTypeMod);
extern List * SendShardStatisticsQueriesInParallel(List *citusTableIds,
bool useDistributedTransaction);
extern bool GetNodeDiskSpaceStatsForConnection(MultiConnection *connection,
uint64 *availableBytes,
uint64 *totalBytes);
extern void ExecuteQueryViaSPI(char *query, int SPIOK);
extern void EnsureSequenceTypeSupported(Oid seqOid, Oid attributeTypeId, Oid
ownerRelationId);
extern void AlterSequenceType(Oid seqOid, Oid typeOid);
extern void EnsureRelationHasCompatibleSequenceTypes(Oid relationId);
#endif /* METADATA_UTILITY_H */
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