greenplumn backoff 源码
greenplumn backoff 代码
文件路径：/src/include/postmaster/backoff.h
/*
* backoff.h
*
* Created on: Oct 20, 2009
* Author: siva
*/
#ifndef BACKOFF_H_
#define BACKOFF_H_
#include "fmgr.h"
/* GUCs */
extern bool gp_enable_resqueue_priority;
extern int gp_resqueue_priority_local_interval;
extern int gp_resqueue_priority_sweeper_interval;
extern int gp_resqueue_priority_inactivity_timeout;
extern int gp_resqueue_priority_grouping_timeout;
extern double gp_resqueue_priority_cpucores_per_segment;
extern char* gp_resqueue_priority_default_value;
extern void BackoffBackendEntryInit(int sessionid, int commandcount, Oid queueId);
extern void BackoffBackendEntryExit(void);
extern void BackoffStateInit(void);
extern Datum gp_adjust_priority_int(PG_FUNCTION_ARGS);
extern Datum gp_adjust_priority_value(PG_FUNCTION_ARGS);
extern Datum gp_list_backend_priorities(PG_FUNCTION_ARGS);
extern void BackoffSweeperMain(Datum main_arg);
extern bool BackoffSweeperStartRule(Datum main_arg);
/* needed by metrics_collector */
extern char *BackoffPriorityIntToValue(int weight);
/* needed by metrics_collector */
extern int ResourceQueueGetPriorityWeight(Oid queueId);
#endif /* BACKOFF_H_ */
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