mirror of https://github.com/citusdata/citus.git
56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_dist_rebalance_strategy.h
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* definition of the "rebalance strategy" relation (pg_dist_rebalance_strategy).
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*
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* This table contains all the available strategies for rebalancing.
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*
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* Copyright (c) Citus Data, Inc.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_DIST_REBALANCE_STRATEGY_H
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#define PG_DIST_REBALANCE_STRATEGY_H
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#include "postgres.h"
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/* ----------------
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* pg_dist_shard definition.
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* ----------------
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*/
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typedef struct FormData_pg_dist_rebalance_strategy
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{
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NameData name; /* user readable name of the strategy */
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bool default_strategy; /* if this strategy is the default strategy */
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Oid shardCostFunction; /* function to calculate the shard cost */
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Oid nodeCapacityFunction; /* function to get the capacity of a node */
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Oid shardAllowedOnNodeFunction; /* function to check if shard is allowed on node */
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float4 defaultThreshold; /* default threshold that is used */
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float4 minimumThreshold; /* minimum threshold that is allowed */
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float4 improvementThreshold; /* the shard size threshold that is used */
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} FormData_pg_dist_rebalance_strategy;
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/* ----------------
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* Form_pg_dist_shards corresponds to a pointer to a tuple with
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* the format of pg_dist_shards relation.
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* ----------------
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*/
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typedef FormData_pg_dist_rebalance_strategy *Form_pg_dist_rebalance_strategy;
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/* ----------------
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* compiler constants for pg_dist_rebalance_strategy
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* ----------------
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*/
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#define Natts_pg_dist_rebalance_strategy 7
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#define Anum_pg_dist_rebalance_strategy_name 1
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#define Anum_pg_dist_rebalance_strategy_default_strategy 2
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#define Anum_pg_dist_rebalance_strategy_shard_cost_function 3
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#define Anum_pg_dist_rebalance_strategy_node_capacity_function 4
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#define Anum_pg_dist_rebalance_strategy_shard_allowed_on_node_function 5
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#define Anum_pg_dist_rebalance_strategy_default_threshold 6
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#define Anum_pg_dist_rebalance_strategy_minimum_threshold 7
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#endif /* PG_DIST_REBALANCE_STRATEGY_H */
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