mirror of https://github.com/citusdata/citus.git
174 lines
5.7 KiB
C
174 lines
5.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* metadata_cache.h
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* Executor support for Citus.
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*
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* Copyright (c) 2012-2016, Citus Data, Inc.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef METADATA_CACHE_H
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#define METADATA_CACHE_H
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#include "fmgr.h"
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#include "distributed/master_metadata_utility.h"
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#include "distributed/pg_dist_partition.h"
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#include "distributed/worker_manager.h"
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#include "utils/hsearch.h"
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extern bool EnableVersionChecks;
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/* managed via guc.c */
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typedef enum
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{
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USE_SECONDARY_NODES_NEVER = 0,
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USE_SECONDARY_NODES_ALWAYS = 1
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} ReadFromSecondariesType;
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extern int ReadFromSecondaries;
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/*
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* Representation of a table's metadata that is frequently used for
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* distributed execution. Cached.
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*/
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typedef struct
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{
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/* lookup key - must be first. A pg_class.oid oid. */
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Oid relationId;
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/*
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* Has an invalidation been received for this entry, requiring a rebuild
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* of the cache entry?
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*/
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bool isValid;
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bool isDistributedTable;
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bool hasUninitializedShardInterval;
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bool hasUniformHashDistribution; /* valid for hash partitioned tables */
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bool hasOverlappingShardInterval;
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/* pg_dist_partition metadata for this table */
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char *partitionKeyString;
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Var *partitionColumn;
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char partitionMethod;
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uint32 colocationId;
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char replicationModel;
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/* pg_dist_shard metadata (variable-length ShardInterval array) for this table */
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int shardIntervalArrayLength;
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ShardInterval **sortedShardIntervalArray;
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/* comparator for partition column's type, NULL if DISTRIBUTE_BY_NONE */
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FmgrInfo *shardColumnCompareFunction;
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/*
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* Comparator for partition interval type (different from
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* shardValueCompareFunction if hash-partitioned), NULL if
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* DISTRIBUTE_BY_NONE.
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*/
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FmgrInfo *shardIntervalCompareFunction;
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FmgrInfo *hashFunction; /* NULL if table is not distributed by hash */
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/*
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* The following two lists consists of relationIds that this distributed
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* relation has a foreign key to (e.g., referencedRelationsViaForeignKey) or
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* other relations has a foreign key to to this relation (e.g.,
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* referencingRelationsViaForeignKey).
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*
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* Note that we're keeping all transitive foreign key references as well
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* such that if relation A refers to B, and B refers to C, we keep A and B
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* in C's referencingRelationsViaForeignKey.
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*/
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List *referencedRelationsViaForeignKey;
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List *referencingRelationsViaForeignKey;
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/* pg_dist_placement metadata */
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GroupShardPlacement **arrayOfPlacementArrays;
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int *arrayOfPlacementArrayLengths;
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} DistTableCacheEntry;
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extern bool IsDistributedTable(Oid relationId);
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extern List * DistributedTableList(void);
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extern ShardInterval * LoadShardInterval(uint64 shardId);
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extern Oid RelationIdForShard(uint64 shardId);
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extern bool ReferenceTableShardId(uint64 shardId);
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extern ShardPlacement * FindShardPlacementOnGroup(int32 groupId, uint64 shardId);
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extern GroupShardPlacement * LoadGroupShardPlacement(uint64 shardId, uint64 placementId);
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extern ShardPlacement * LoadShardPlacement(uint64 shardId, uint64 placementId);
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extern DistTableCacheEntry * DistributedTableCacheEntry(Oid distributedRelationId);
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extern int32 GetLocalGroupId(void);
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extern List * DistTableOidList(void);
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extern Oid LookupShardRelation(int64 shardId, bool missing_ok);
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extern List * ShardPlacementList(uint64 shardId);
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extern void CitusInvalidateRelcacheByRelid(Oid relationId);
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extern void CitusInvalidateRelcacheByShardId(int64 shardId);
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extern void InvalidateForeignKeyGraph(void);
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extern void FlushDistTableCache(void);
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extern void InvalidateMetadataSystemCache(void);
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extern Datum DistNodeMetadata(void);
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extern bool HasUniformHashDistribution(ShardInterval **shardIntervalArray,
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int shardIntervalArrayLength);
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extern bool CitusHasBeenLoaded(void);
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extern bool CheckCitusVersion(int elevel);
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extern bool CheckAvailableVersion(int elevel);
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bool MajorVersionsCompatible(char *leftVersion, char *rightVersion);
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extern void EnsureModificationsCanRun(void);
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/* access WorkerNodeHash */
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extern HTAB * GetWorkerNodeHash(void);
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extern WorkerNode * LookupNodeByNodeId(uint32 nodeId);
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/* relation oids */
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extern Oid DistColocationRelationId(void);
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extern Oid DistColocationConfigurationIndexId(void);
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extern Oid DistColocationColocationidIndexId(void);
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extern Oid DistPartitionRelationId(void);
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extern Oid DistShardRelationId(void);
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extern Oid DistPlacementRelationId(void);
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extern Oid DistNodeRelationId(void);
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extern Oid DistLocalGroupIdRelationId(void);
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/* index oids */
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extern Oid DistNodeNodeIdIndexId(void);
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extern Oid DistPartitionLogicalRelidIndexId(void);
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extern Oid DistPartitionColocationidIndexId(void);
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extern Oid DistShardLogicalRelidIndexId(void);
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extern Oid DistShardShardidIndexId(void);
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extern Oid DistPlacementShardidIndexId(void);
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extern Oid DistPlacementPlacementidIndexId(void);
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extern Oid DistTransactionRelationId(void);
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extern Oid DistTransactionGroupIndexId(void);
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extern Oid DistTransactionRecordIndexId(void);
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extern Oid DistPlacementGroupidIndexId(void);
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/* type oids */
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extern Oid CitusCopyFormatTypeId(void);
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/* function oids */
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extern Oid CitusReadIntermediateResultFuncId(void);
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extern Oid CitusExtraDataContainerFuncId(void);
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extern Oid CitusWorkerHashFunctionId(void);
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extern Oid CitusTextSendAsJsonbFunctionId(void);
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extern Oid PgTableVisibleFuncId(void);
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extern Oid CitusTableVisibleFuncId(void);
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/* enum oids */
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extern Oid PrimaryNodeRoleId(void);
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extern Oid SecondaryNodeRoleId(void);
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extern Oid UnavailableNodeRoleId(void);
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extern Oid CitusCopyFormatTypeId(void);
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extern Oid TextCopyFormatId(void);
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extern Oid BinaryCopyFormatId(void);
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/* user related functions */
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extern Oid CitusExtensionOwner(void);
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extern char * CitusExtensionOwnerName(void);
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extern char * CurrentUserName(void);
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extern char * CurrentDatabaseName(void);
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#endif /* METADATA_CACHE_H */
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