external/pg_stat_monitor
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PG-154: Add backup option in case of no space left in the bucket.

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This commit is contained in:
Ibrar Ahmed
2020-11-29 20:11:23 +00:00
parent 75bafcb590
commit bedc2ffc78
4 changed files with 251 additions and 83 deletions
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33
pg_stat_monitor.h
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@@ -57,6 +57,7 @@
#define JUMBLE_SIZE 1024 /* query serialization buffer size */
#define MAX_RESPONSE_BUCKET 10
#define INVALID_BUCKET_ID -1
#define MAX_REL_LEN 255
#define MAX_BUCKETS 10
#define TEXT_LEN 255
@@ -65,6 +66,18 @@
#define CMD_LST 10
#define CMD_LEN 20
#define APPLICATIONNAME_LEN 100
#define PGSM_OVER_FLOW_MAX 10
#define MAX_QUERY_BUF (PGSM_QUERY_BUF_SIZE * 1024 * 1024)
#define MAX_BUCKETS_MEM (PGSM_MAX * 1024 * 1024)
#define BUCKETS_MEM_OVERFLOW() ((hash_get_num_entries(pgss_hash) * sizeof(pgssEntry)) >= MAX_BUCKETS_MEM)
//#define MAX_QUERY_BUFFER_BUCKET 200
#define MAX_QUERY_BUFFER_BUCKET MAX_QUERY_BUF / PGSM_MAX_BUCKETS
#define MAX_BUCKET_ENTRIES (MAX_BUCKETS_MEM / sizeof(pgssEntry))
#define QUERY_BUFFER_OVERFLOW(x,y) ((x + y + sizeof(uint64) + sizeof(uint64)) > MAX_QUERY_BUFFER_BUCKET)
#define QUERY_MARGIN 100
#define MIN_QUERY_LEN 10
typedef struct GucVariables
{
@@ -106,6 +119,18 @@ typedef enum AGG_KEY
#define MAX_QUERY_LEN 1024
/* shared nenory storage for the query */
typedef struct pgssQueryHashKey
{
uint64 queryid; /* query identifier */
uint64 bucket_id; /* bucket number */
} pgssQueryHashKey;
typedef struct pgssQueryEntry
{
pgssQueryHashKey key; /* hash key of entry - MUST BE FIRST */
uint64 pos; /* bucket number */
} pgssQueryEntry;
typedef struct pgssHashKey
{
uint64 bucket_id; /* bucket number */
@@ -213,7 +238,6 @@ typedef struct pgssSharedState
int64 n_writers; /* number of active writers to query file */
uint64 current_wbucket;
uint64 prev_bucket_usec;
uint64 bucket_overflow[MAX_BUCKETS];
uint64 bucket_entry[MAX_BUCKETS];
int64 query_buf_size_bucket;
int32 relations[REL_LST];
@@ -228,7 +252,6 @@ do { \
x->n_writers = 0; \
x->current_wbucket = 0; \
x->prev_bucket_usec = 0; \
memset(&x->bucket_overflow, 0, MAX_BUCKETS * sizeof(uint64)); \
memset(&x->bucket_entry, 0, MAX_BUCKETS * sizeof(uint64)); \
} while(0)
@@ -282,11 +305,15 @@ void pgss_shmem_shutdown(int code, Datum arg);
int pgsm_get_bucket_size(void);
pgssSharedState* pgsm_get_ss(void);
HTAB* pgsm_get_hash(void);
HTAB* pgsm_get_query_hash(void);
void hash_entry_reset(void);
void hash_query_entry_dealloc(int bucket);
void hash_entry_dealloc(int bucket);
pgssEntry* hash_entry_alloc(pgssSharedState *pgss, pgssHashKey *key, int encoding);
Size hash_memsize(void);
pgssEntry* hash_create_query_entry(unsigned int queryid, unsigned int userid, unsigned int dbid, unsigned int bucket_id, unsigned int ip);
bool hash_find_query_entry(uint64 bucket_id, uint64 queryid);
bool hash_create_query_entry(uint64 bucket_id, uint64 queryid);
/* hash_query.c */
void pgss_startup(void);