mirror of https://github.com/citusdata/citus.git
141 lines
6.0 KiB
C
141 lines
6.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* master_protocol.h
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* Header for shared declarations for access to master node data. These data
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* are used to create new shards or update existing ones.
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*
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* Copyright (c) 2012-2016, Citus Data, Inc.
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*
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* $Id$
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef MASTER_PROTOCOL_H
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#define MASTER_PROTOCOL_H
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#include "postgres.h"
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#include "c.h"
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#include "fmgr.h"
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#include "nodes/pg_list.h"
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/*
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* In our distributed database, we need a mechanism to make remote procedure
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* calls between clients, the master node, and worker nodes. These remote calls
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* require serializing and deserializing values and function signatures between
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* nodes; and for these, we currently use PostgreSQL's built-in type and
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* function definition system. This approach is by no means ideal however; and
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* our implementation: (i) cannot perform compile-time type checks, (ii)
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* requires additional effort when upgrading to new function signatures, and
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* (iii) hides argument and return value names and types behind complicated
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* pg_proc.h definitions.
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*
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* An ideal implementation should overcome these problems, and make it much
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* easier to pass values back and forth between nodes. One such implementation
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* that comes close to ideal is Google's Protocol Buffers. Nonetheless, we do
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* not use it in here as its inclusion requires changes to PostgreSQL's make
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* system, and a native C version is currently unavailable.
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*/
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/* Number of tuple fields that master node functions return */
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#define TABLE_METADATA_FIELDS 7
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#define CANDIDATE_NODE_FIELDS 2
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#define WORKER_NODE_FIELDS 2
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/* Name of columnar foreign data wrapper */
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#define CSTORE_FDW_NAME "cstore_fdw"
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#define SHARDID_SEQUENCE_NAME "pg_dist_shardid_seq"
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#define PLACEMENTID_SEQUENCE_NAME "pg_dist_shard_placement_placementid_seq"
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/* Remote call definitions to help with data staging and deletion */
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#define WORKER_APPLY_SHARD_DDL_COMMAND \
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"SELECT worker_apply_shard_ddl_command (" UINT64_FORMAT ", %s, %s)"
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#define WORKER_APPLY_SHARD_DDL_COMMAND_WITHOUT_SCHEMA \
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"SELECT worker_apply_shard_ddl_command (" UINT64_FORMAT ", %s)"
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#define WORKER_APPEND_TABLE_TO_SHARD \
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"SELECT worker_append_table_to_shard (%s, %s, %s, %u)"
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#define WORKER_APPLY_INTER_SHARD_DDL_COMMAND \
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"SELECT worker_apply_inter_shard_ddl_command (" UINT64_FORMAT ", %s, " UINT64_FORMAT \
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", %s, %s)"
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#define SHARD_RANGE_QUERY "SELECT min(%s), max(%s) FROM %s"
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#define SHARD_TABLE_SIZE_QUERY "SELECT pg_table_size(%s)"
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#define SHARD_CSTORE_TABLE_SIZE_QUERY "SELECT cstore_table_size(%s)"
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#define DROP_REGULAR_TABLE_COMMAND "DROP TABLE IF EXISTS %s"
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#define DROP_FOREIGN_TABLE_COMMAND "DROP FOREIGN TABLE IF EXISTS %s"
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#define CREATE_SCHEMA_COMMAND "CREATE SCHEMA IF NOT EXISTS %s"
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#define CREATE_EMPTY_SHARD_QUERY "SELECT master_create_empty_shard('%s')"
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#define FINALIZED_SHARD_PLACEMENTS_QUERY \
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"SELECT nodename, nodeport FROM pg_dist_shard_placement WHERE shardstate = 1 AND shardid = %ld"
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#define UPDATE_SHARD_STATISTICS_QUERY \
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"SELECT master_update_shard_statistics(%ld)"
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#define PARTITION_METHOD_QUERY "SELECT part_method FROM master_get_table_metadata('%s');"
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/* Enumeration that defines the shard placement policy to use while staging */
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typedef enum
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{
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SHARD_PLACEMENT_INVALID_FIRST = 0,
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SHARD_PLACEMENT_LOCAL_NODE_FIRST = 1,
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SHARD_PLACEMENT_ROUND_ROBIN = 2,
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SHARD_PLACEMENT_RANDOM = 3
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} ShardPlacementPolicyType;
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/* Config variables managed via guc.c */
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extern int ShardCount;
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extern int ShardReplicationFactor;
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extern int ShardMaxSize;
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extern int ShardPlacementPolicy;
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/* Function declarations local to the distributed module */
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extern bool CStoreTable(Oid relationId);
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extern uint64 GetNextShardId(void);
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extern Oid ResolveRelationId(text *relationName);
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extern List * GetTableDDLEvents(Oid relationId);
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extern List * GetTableForeignConstraintCommands(Oid relationId);
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extern char ShardStorageType(Oid relationId);
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extern void CheckDistributedTable(Oid relationId);
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extern void CreateShardPlacements(Oid relationId, int64 shardId, List *ddlEventList,
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char *newPlacementOwner, List *workerNodeList,
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int workerStartIndex, int replicationFactor);
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extern uint64 UpdateShardStatistics(int64 shardId);
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extern void CreateShardsWithRoundRobinPolicy(Oid distributedTableId, int32 shardCount,
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int32 replicationFactor);
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extern void CreateColocatedShards(Oid targetRelationId, Oid sourceRelationId);
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extern bool WorkerCreateShard(Oid relationId, char *nodeName, uint32 nodePort,
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int shardIndex, uint64 shardId, char *newShardOwner,
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List *ddlCommandList, List *foreignConstraintCommadList);
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extern Oid ForeignConstraintGetReferencedTableId(char *queryString);
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extern void CheckHashPartitionedTable(Oid distributedTableId);
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/* Function declarations for generating metadata for shard and placement creation */
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extern Datum master_get_table_metadata(PG_FUNCTION_ARGS);
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extern Datum master_get_table_ddl_events(PG_FUNCTION_ARGS);
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extern Datum master_get_new_shardid(PG_FUNCTION_ARGS);
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extern Datum master_get_new_placementid(PG_FUNCTION_ARGS);
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extern Datum master_get_local_first_candidate_nodes(PG_FUNCTION_ARGS);
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extern Datum master_get_round_robin_candidate_nodes(PG_FUNCTION_ARGS);
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extern Datum master_get_active_worker_nodes(PG_FUNCTION_ARGS);
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/* Function declarations to help with data staging and deletion */
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extern Datum master_create_empty_shard(PG_FUNCTION_ARGS);
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extern Datum master_append_table_to_shard(PG_FUNCTION_ARGS);
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extern Datum master_update_shard_statistics(PG_FUNCTION_ARGS);
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extern Datum master_apply_delete_command(PG_FUNCTION_ARGS);
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extern Datum master_drop_sequences(PG_FUNCTION_ARGS);
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extern Datum master_modify_multiple_shards(PG_FUNCTION_ARGS);
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extern Datum master_drop_all_shards(PG_FUNCTION_ARGS);
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/* function declarations for shard creation functionality */
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extern Datum master_create_worker_shards(PG_FUNCTION_ARGS);
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/* function declarations for shard repair functionality */
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extern Datum master_copy_shard_placement(PG_FUNCTION_ARGS);
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#endif /* MASTER_PROTOCOL_H */
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