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/*
** Zabbix
** Copyright (C) 2001-2021 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
#include "common.h"
#include "zbxdb.h"
#include "dbcache.h"
#include "log.h"
#include "history_compress.h"
#if defined(HAVE_POSTGRESQL)
#define ZBX_TS_SEGMENT_BY "itemid"
#define ZBX_TS_UNIX_NOW "zbx_ts_unix_now"
#define ZBX_TS_UNIX_NOW_CREATE "create or replace function "ZBX_TS_UNIX_NOW"() returns integer language sql" \
" stable as $$ select extract(epoch from now())::integer $$"
#define COMPRESSION_TOLERANCE (SEC_PER_HOUR * 2)
#define COMPRESSION_POLICY_REMOVE (0 == ZBX_DB_TSDB_V1 ? "remove_compression_policy" : \
"remove_compress_chunks_policy")
#define COMPRESSION_POLICY_ADD (0 == ZBX_DB_TSDB_V1 ? "add_compression_policy" : \
"add_compress_chunks_policy")
typedef enum
{
ZBX_COMPRESS_TABLE_HISTORY = 0,
ZBX_COMPRESS_TABLE_TRENDS
} zbx_compress_table_t;
typedef struct
{
const char *name;
zbx_compress_table_t type;
} zbx_history_table_compression_options_t;
static zbx_history_table_compression_options_t compression_tables[] = {
{"history", ZBX_COMPRESS_TABLE_HISTORY},
{"history_uint", ZBX_COMPRESS_TABLE_HISTORY},
{"history_str", ZBX_COMPRESS_TABLE_HISTORY},
{"history_text", ZBX_COMPRESS_TABLE_HISTORY},
{"history_log", ZBX_COMPRESS_TABLE_HISTORY},
{"trends", ZBX_COMPRESS_TABLE_TRENDS},
{"trends_uint", ZBX_COMPRESS_TABLE_TRENDS}
};
static unsigned char compression_status_cache = 0;
static int compress_older_cache = 0;
/******************************************************************************
* *
* Function: hk_check_table_segmentation *
* *
* Purpose: check that hypertables are segmented by itemid *
* *
* Parameters: table_name - [IN] hypertable name *
* type - [IN] history or trends *
* *
******************************************************************************/
static void hk_check_table_segmentation(const char *table_name, zbx_compress_table_t type)
{
DB_RESULT result;
DB_ROW row;
int i;
zabbix_log(LOG_LEVEL_DEBUG, "In %s(): table: %s", __func__, table_name);
/* get hypertable segmentby attribute name */
if (1 == ZBX_DB_TSDB_V1)
{
result = DBselect("select c.attname from _timescaledb_catalog.hypertable_compression c"
" inner join _timescaledb_catalog.hypertable h on (h.id=c.hypertable_id)"
" where c.segmentby_column_index<>0 and h.table_name='%s'", table_name);
}
else
{
result = DBselect("select attname from timescaledb_information.compression_settings"
" where hypertable_schema='%s' and hypertable_name='%s'"
" and segmentby_column_index is not null", zbx_db_get_schema_esc(), table_name);
}
for (i = 0; NULL != (row = DBfetch(result)); i++)
{
if (0 != strcmp(row[0], ZBX_TS_SEGMENT_BY))
i++;
}
if (1 != i)
{
DBexecute("alter table %s set (timescaledb.compress,timescaledb.compress_segmentby='%s',"
"timescaledb.compress_orderby='%s')", table_name, ZBX_TS_SEGMENT_BY,
(ZBX_COMPRESS_TABLE_HISTORY == type) ? "clock,ns" : "clock");
}
DBfree_result(result);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
}
/******************************************************************************
* *
* Function: hk_get_table_compression_age *
* *
* Purpose: returns data compression age configured for hypertable *
* *
* Parameters: table_name - [IN] hypertable name *
* *
* Return value: data compression age in seconds *
* *
******************************************************************************/
static int hk_get_table_compression_age(const char *table_name)
{
int age = 0;
DB_RESULT result;
DB_ROW row;
zabbix_log(LOG_LEVEL_DEBUG, "In %s(): table: %s", __func__, table_name);
if (1 == ZBX_DB_TSDB_V1)
{
result = DBselect("select (p.older_than).integer_interval"
" from _timescaledb_config.bgw_policy_compress_chunks p"
" inner join _timescaledb_catalog.hypertable h on (h.id=p.hypertable_id)"
" where h.table_name='%s'", table_name);
}
else
{
result = DBselect("select extract(epoch from (config::json->>'compress_after')::interval) from"
" timescaledb_information.jobs where application_name like 'Compression%%' and"
" hypertable_schema='%s' and hypertable_name='%s'", zbx_db_get_schema_esc(), table_name);
}
if (NULL != (row = DBfetch(result)))
age = atoi(row[0]);
DBfree_result(result);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s() age: %d", __func__, age);
return age;
}
/******************************************************************************
* *
* Function: hk_check_table_compression_age *
* *
* Purpose: ensures that table compression is configured to specified age *
* *
* Parameters: table_name - [IN] hypertable name *
* age - [IN] compression age *
* *
******************************************************************************/
static void hk_check_table_compression_age(const char *table_name, int age)
{
int compress_after;
zabbix_log(LOG_LEVEL_DEBUG, "In %s(): table: %s age %d", __func__, table_name, age);
if (age != (compress_after = hk_get_table_compression_age(table_name)))
{
DB_RESULT res;
if (0 != compress_after)
DBfree_result(DBselect("select %s('%s')", COMPRESSION_POLICY_REMOVE, table_name));
zabbix_log(LOG_LEVEL_DEBUG, "adding compression policy to table: %s age %d", table_name, age);
res = DBselect("select %s('%s', integer '%d')", COMPRESSION_POLICY_ADD, table_name, age);
if (NULL == res)
zabbix_log(LOG_LEVEL_ERR, "failed to add compression policy to table '%s'", table_name);
else
DBfree_result(res);
}
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
}
/******************************************************************************
* *
* Function: hk_history_enable_compression *
* *
* Purpose: turns table compression on for items older than specified age *
* *
* Parameters: age - [IN] compression age *
* *
******************************************************************************/
static void hk_history_enable_compression(int age)
{
int i;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
for (i = 0; i < (int)ARRSIZE(compression_tables); i++)
{
DBfree_result(DBselect("select set_integer_now_func('%s', '"ZBX_TS_UNIX_NOW"', true)",
compression_tables[i].name));
hk_check_table_segmentation(compression_tables[i].name, compression_tables[i].type);
hk_check_table_compression_age(compression_tables[i].name, age);
}
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
}
/******************************************************************************
* *
* Function: hk_history_disable_compression *
* *
* Purpose: turns table compression off *
* *
******************************************************************************/
static void hk_history_disable_compression(void)
{
int i;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
for (i = 0; i < (int)ARRSIZE(compression_tables); i++)
{
if (0 == hk_get_table_compression_age(compression_tables[i].name))
continue;
DBfree_result(DBselect("select %s('%s')", COMPRESSION_POLICY_REMOVE, compression_tables[i].name));
}
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
}
#endif
/******************************************************************************
* *
* Function: hk_history_compression_init *
* *
* Purpose: initializing compression for history/trends tables *
* *
******************************************************************************/
void hk_history_compression_init(void)
{
#if defined(HAVE_POSTGRESQL)
int disable_compression = 0;
char *db_log_level = NULL;
zbx_config_t cfg;
DB_RESULT result;
DB_ROW row;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
DBconnect(ZBX_DB_CONNECT_NORMAL);
zbx_config_get(&cfg, ZBX_CONFIG_FLAGS_DB_EXTENSION);
compression_status_cache = cfg.db.history_compression_status;
compress_older_cache = cfg.db.history_compress_older;
if (0 == zbx_strcmp_null(cfg.db.extension, ZBX_CONFIG_DB_EXTENSION_TIMESCALE))
{
/* surpress notice logs during DB initialization */
result = DBselect("show client_min_messages");
if (NULL != (row = DBfetch(result)))
{
db_log_level = zbx_strdup(db_log_level, row[0]);
DBexecute("set client_min_messages to warning");
}
DBfree_result(result);
if (ON == cfg.db.history_compression_status)
{
if (0 == cfg.db.history_compress_older)
{
disable_compression = 1;
hk_history_disable_compression();
}
else
{
DBexecute(ZBX_TS_UNIX_NOW_CREATE);
hk_history_enable_compression(cfg.db.history_compress_older + COMPRESSION_TOLERANCE);
}
}
else
{
hk_history_disable_compression();
}
}
else if (ON == cfg.db.history_compression_status)
{
disable_compression = 1;
}
if (0 != disable_compression && ZBX_DB_OK > DBexecute("update config set compression_status=0"))
zabbix_log(LOG_LEVEL_ERR, "failed to set database compression status");
zbx_config_clean(&cfg);
if (NULL != db_log_level)
{
DBexecute("set client_min_messages to %s", db_log_level);
zbx_free(db_log_level);
}
DBclose();
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
#endif
}
/******************************************************************************
* *
* Function: hk_history_compression_update *
* *
* Purpose: history compression settings periodic update *
* *
* Parameters: cfg - [IN] database extension history compression settings *
* *
******************************************************************************/
void hk_history_compression_update(zbx_config_db_t *cfg)
{
#if defined(HAVE_POSTGRESQL)
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
if (ON == cfg->history_compression_status)
{
if (cfg->history_compression_status != compression_status_cache ||
cfg->history_compress_older != compress_older_cache)
{
DBexecute(ZBX_TS_UNIX_NOW_CREATE);
hk_history_enable_compression(cfg->history_compress_older + COMPRESSION_TOLERANCE);
}
}
else if (cfg->history_compression_status != compression_status_cache)
{
hk_history_disable_compression();
}
compression_status_cache = cfg->history_compression_status;
compress_older_cache = cfg->history_compress_older;
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __func__);
#else
ZBX_UNUSED(cfg);
#endif
}
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