mirror of https://github.com/citusdata/citus.git
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* master_metadata_utility.h
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* Type and function declarations used for reading and modifying master
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* node's metadata.
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*
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* Copyright (c) 2014, 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_METADATA_UTILITY_H
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#define MASTER_METADATA_UTILITY_H
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#include "access/htup.h"
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#include "access/tupdesc.h"
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#include "distributed/citus_nodes.h"
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#include "distributed/relay_utility.h"
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#include "utils/relcache.h"
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/* total number of hash tokens (2^32) */
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#define HASH_TOKEN_COUNT INT64CONST(4294967296UL)
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/* In-memory representation of a typed tuple in pg_dist_shard. */
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typedef struct ShardInterval
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{
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CitusNodeTag type;
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Oid relationId;
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char storageType;
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Oid valueTypeId; /* min/max value datum's typeId */
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int valueTypeLen; /* min/max value datum's typelen */
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bool valueByVal; /* min/max value datum's byval */
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bool minValueExists;
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bool maxValueExists;
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Datum minValue; /* a shard's typed min value datum */
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Datum maxValue; /* a shard's typed max value datum */
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uint64 shardId;
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} ShardInterval;
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/* In-memory representation of a tuple in pg_dist_shard_placement. */
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typedef struct ShardPlacement
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{
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CitusNodeTag type;
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Oid tupleOid; /* unique oid that implies this row's insertion order */
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uint64 shardId;
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uint64 shardLength;
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RelayFileState shardState;
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char *nodeName;
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uint32 nodePort;
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} ShardPlacement;
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/* Function declarations to read shard and shard placement data */
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extern List * LoadShardIntervalList(Oid relationId);
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extern List * LoadShardList(Oid relationId);
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extern char * LoadShardAlias(Oid relationId, uint64 shardId);
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extern void CopyShardInterval(ShardInterval *srcInterval, ShardInterval *destInterval);
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extern uint64 ShardLength(uint64 shardId);
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extern List * FinalizedShardPlacementList(uint64 shardId);
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extern List * ShardPlacementList(uint64 shardId);
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extern ShardPlacement * TupleToShardPlacement(TupleDesc tupleDesc,
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HeapTuple heapTuple);
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/* Function declarations to modify shard and shard placement data */
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extern void InsertShardRow(Oid relationId, uint64 shardId, char storageType,
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text *shardMinValue, text *shardMaxValue);
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extern void InsertShardPlacementRow(uint64 shardId, char shardState, uint64 shardLength,
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char *nodeName, uint32 nodePort);
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extern void DeleteShardRow(uint64 shardId);
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extern void DeleteShardPlacementRow(uint64 shardId, char *workerName, uint32 workerPort);
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/* Remaining metadata utility functions */
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extern Node * BuildDistributionKeyFromColumnName(Relation distributedRelation,
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char *columnName);
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#endif /* MASTER_METADATA_UTILITY_H */
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