netdata/database/engine/rrdengineapi.c at master · araemo/netdata · GitHub

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// SPDX-License-Identifier: GPL-3.0-or-later

#include "rrdengine.h"

/* Default global database instance */

static struct rrdengine_instance default_global_ctx;

int default_rrdeng_page_cache_mb = 32;

int default_rrdeng_disk_quota_mb = RRDENG_MIN_DISK_SPACE_MB;

/* Default behaviour is to unblock data collection if the page cache is full of dirty pages by dropping metrics */

uint8_t rrdeng_drop_metrics_under_page_cache_pressure = 1;

* Gets a handle for storing metrics to the database.

* The handle must be released with rrdeng_store_metric_final().

void rrdeng_store_metric_init(RRDDIM *rd)

{

struct rrdeng_collect_handle *handle;

struct page_cache *pg_cache;

struct rrdengine_instance *ctx;

uuid_t temp_id;

Pvoid_t *PValue;

struct pg_cache_page_index *page_index;

EVP_MD_CTX *evpctx;

unsigned char hash_value[EVP_MAX_MD_SIZE];

unsigned int hash_len;

//&default_global_ctx; TODO: test this use case or remove it?

ctx = rd->rrdset->rrdhost->rrdeng_ctx;

pg_cache = &ctx->pg_cache;

handle = &rd->state->handle.rrdeng;

handle->ctx = ctx;

evpctx = EVP_MD_CTX_create();

EVP_DigestInit_ex(evpctx, EVP_sha256(), NULL);

EVP_DigestUpdate(evpctx, rd->id, strlen(rd->id));

EVP_DigestUpdate(evpctx, rd->rrdset->id, strlen(rd->rrdset->id));

EVP_DigestFinal_ex(evpctx, hash_value, &hash_len);

EVP_MD_CTX_destroy(evpctx);

assert(hash_len > sizeof(temp_id));

memcpy(&temp_id, hash_value, sizeof(temp_id));

handle->descr = NULL;

handle->prev_descr = NULL;

handle->unaligned_page = 0;

uv_rwlock_rdlock(&pg_cache->metrics_index.lock);

PValue = JudyHSGet(pg_cache->metrics_index.JudyHS_array, &temp_id, sizeof(uuid_t));

if (likely(NULL != PValue)) {

page_index = *PValue;

}

uv_rwlock_rdunlock(&pg_cache->metrics_index.lock);

if (NULL == PValue) {

/* First time we see the UUID */

uv_rwlock_wrlock(&pg_cache->metrics_index.lock);

PValue = JudyHSIns(&pg_cache->metrics_index.JudyHS_array, &temp_id, sizeof(uuid_t), PJE0);

assert(NULL == *PValue); /* TODO: figure out concurrency model */

*PValue = page_index = create_page_index(&temp_id);

page_index->prev = pg_cache->metrics_index.last_page_index;

pg_cache->metrics_index.last_page_index = page_index;

uv_rwlock_wrunlock(&pg_cache->metrics_index.lock);

}

rd->state->rrdeng_uuid = &page_index->id;

handle->page_index = page_index;

}

/* The page must be populated and referenced */

static int page_has_only_empty_metrics(struct rrdeng_page_descr *descr)

{

unsigned i;

uint8_t has_only_empty_metrics = 1;

storage_number *page;

page = descr->pg_cache_descr->page;

for (i = 0 ; i < descr->page_length / sizeof(storage_number); ++i) {

if (SN_EMPTY_SLOT != page[i]) {

has_only_empty_metrics = 0;

break;

}

return has_only_empty_metrics;

}

void rrdeng_store_metric_flush_current_page(RRDDIM *rd)

{

struct rrdeng_collect_handle *handle;

struct rrdengine_instance *ctx;

struct rrdeng_page_descr *descr;

handle = &rd->state->handle.rrdeng;

ctx = handle->ctx;

descr = handle->descr;

if (unlikely(NULL == descr)) {

return;

}

if (likely(descr->page_length)) {

int ret, page_is_empty;

rrd_stat_atomic_add(&ctx->stats.metric_API_producers, -1);

if (handle->prev_descr) {

/* unpin old second page */

pg_cache_put(ctx, handle->prev_descr);

}

page_is_empty = page_has_only_empty_metrics(descr);

if (page_is_empty) {

debug(D_RRDENGINE, "Page has empty metrics only, deleting:");

if (unlikely(debug_flags & D_RRDENGINE))

print_page_cache_descr(descr);

pg_cache_put(ctx, descr);

pg_cache_punch_hole(ctx, descr, 1, 0);

handle->prev_descr = NULL;

} else {

/* added 1 extra reference to keep 2 dirty pages pinned per metric, expected refcnt = 2 */

rrdeng_page_descr_mutex_lock(ctx, descr);

ret = pg_cache_try_get_unsafe(descr, 0);

rrdeng_page_descr_mutex_unlock(ctx, descr);

assert (1 == ret);

rrdeng_commit_page(ctx, descr, handle->page_correlation_id);

handle->prev_descr = descr;

}

} else {

freez(descr->pg_cache_descr->page);

rrdeng_destroy_pg_cache_descr(ctx, descr->pg_cache_descr);

freez(descr);

}

handle->descr = NULL;

}

void rrdeng_store_metric_next(RRDDIM *rd, usec_t point_in_time, storage_number number)

{

struct rrdeng_collect_handle *handle;

struct rrdengine_instance *ctx;

struct page_cache *pg_cache;

struct rrdeng_page_descr *descr;

storage_number *page;

uint8_t must_flush_unaligned_page = 0, perfect_page_alignment = 0;

handle = &rd->state->handle.rrdeng;

ctx = handle->ctx;

pg_cache = &ctx->pg_cache;

descr = handle->descr;

if (descr) {

/* Make alignment decisions */

if (descr->page_length == rd->rrdset->rrddim_page_alignment) {

/* this is the leading dimension that defines chart alignment */

perfect_page_alignment = 1;

}

/* is the metric far enough out of alignment with the others? */

if (unlikely(descr->page_length + sizeof(number) < rd->rrdset->rrddim_page_alignment)) {

handle->unaligned_page = 1;

debug(D_RRDENGINE, "Metric page is not aligned with chart:");

if (unlikely(debug_flags & D_RRDENGINE))

print_page_cache_descr(descr);

}

if (unlikely(handle->unaligned_page &&

/* did the other metrics change page? */

rd->rrdset->rrddim_page_alignment <= sizeof(number))) {

debug(D_RRDENGINE, "Flushing unaligned metric page.");

must_flush_unaligned_page = 1;

handle->unaligned_page = 0;

}

if (unlikely(NULL == descr ||

descr->page_length + sizeof(number) > RRDENG_BLOCK_SIZE ||

must_flush_unaligned_page)) {

rrdeng_store_metric_flush_current_page(rd);

page = rrdeng_create_page(ctx, &handle->page_index->id, &descr);

assert(page);

handle->descr = descr;

handle->page_correlation_id = rrd_atomic_fetch_add(&pg_cache->committed_page_index.latest_corr_id, 1);

if (0 == rd->rrdset->rrddim_page_alignment) {

/* this is the leading dimension that defines chart alignment */

perfect_page_alignment = 1;

}

page = descr->pg_cache_descr->page;

page[descr->page_length / sizeof(number)] = number;

pg_cache_atomic_set_pg_info(descr, point_in_time, descr->page_length + sizeof(number));

if (perfect_page_alignment)

rd->rrdset->rrddim_page_alignment = descr->page_length;

if (unlikely(INVALID_TIME == descr->start_time)) {

unsigned long new_metric_API_producers, old_metric_API_max_producers, ret_metric_API_max_producers;

descr->start_time = point_in_time;

new_metric_API_producers = rrd_atomic_add_fetch(&ctx->stats.metric_API_producers, 1);

while (unlikely(new_metric_API_producers > (old_metric_API_max_producers = ctx->metric_API_max_producers))) {

/* Increase ctx->metric_API_max_producers */

ret_metric_API_max_producers = ulong_compare_and_swap(&ctx->metric_API_max_producers,

old_metric_API_max_producers,

new_metric_API_producers);

if (old_metric_API_max_producers == ret_metric_API_max_producers) {

/* success */

break;

}

pg_cache_insert(ctx, handle->page_index, descr);

} else {

pg_cache_add_new_metric_time(handle->page_index, descr);

}

* Releases the database reference from the handle for storing metrics.

void rrdeng_store_metric_finalize(RRDDIM *rd)

{

struct rrdeng_collect_handle *handle;

struct rrdengine_instance *ctx;

handle = &rd->state->handle.rrdeng;

ctx = handle->ctx;

rrdeng_store_metric_flush_current_page(rd);

if (handle->prev_descr) {

/* unpin old second page */

pg_cache_put(ctx, handle->prev_descr);

}

/* Returns 1 if the data collection interval is well defined, 0 otherwise */

static int metrics_with_known_interval(struct rrdeng_page_descr *descr)

{

unsigned page_entries;

if (unlikely(INVALID_TIME == descr->start_time || INVALID_TIME == descr->end_time))

return 0;

page_entries = descr->page_length / sizeof(storage_number);

if (likely(page_entries > 1)) {

return 1;

}

return 0;

}

static inline uint32_t *pginfo_to_dt(struct rrdeng_page_info *page_info)

{

return (uint32_t *)&page_info->scratch[0];

}

static inline uint32_t *pginfo_to_points(struct rrdeng_page_info *page_info)

{

return (uint32_t *)&page_info->scratch[sizeof(uint32_t)];

}

/**

* Calculates the regions of different data collection intervals in a netdata chart in the time range

* [start_time,end_time]. This call takes the netdata chart read lock.

* @param st the netdata chart whose data collection interval boundaries are calculated.

* @param start_time inclusive starting time in usec

* @param end_time inclusive ending time in usec

* @param region_info_arrayp It allocates (*region_info_arrayp) and populates it with information of regions of a

* reference dimension that that have different data collection intervals and overlap with the time range

* [start_time,end_time]. The caller must free (*region_info_arrayp) with freez(). If region_info_arrayp is set

* to NULL nothing was allocated.

* @param max_intervalp is derefenced and set to be the largest data collection interval of all regions.

* @return number of regions with different data collection intervals.

unsigned rrdeng_variable_step_boundaries(RRDSET *st, time_t start_time, time_t end_time,

struct rrdeng_region_info **region_info_arrayp, unsigned *max_intervalp)

{

struct pg_cache_page_index *page_index;

struct rrdengine_instance *ctx;

unsigned pages_nr;

RRDDIM *rd_iter, *rd;

struct rrdeng_page_info *page_info_array, *curr, *prev, *old_prev;

unsigned i, j, page_entries, region_points, page_points, regions, max_interval;

time_t now;

usec_t dt, current_position_time, max_time = 0, min_time, curr_time, first_valid_time_in_page;

struct rrdeng_region_info *region_info_array;

uint8_t is_first_region_initialized;

ctx = st->rrdhost->rrdeng_ctx;

regions = 1;

*max_intervalp = max_interval = 0;

region_info_array = NULL;

*region_info_arrayp = NULL;

page_info_array = NULL;

rrdset_rdlock(st);

for(rd_iter = st->dimensions, rd = NULL, min_time = (usec_t)-1 ; rd_iter ; rd_iter = rd_iter->next) {

* Choose oldest dimension as reference. This is not equivalent to the union of all dimensions

* but it is a best effort approximation with a bias towards older metrics in a chart. It

* matches netdata behaviour in the sense that dimensions are generally aligned in a chart

* and older dimensions contain more information about the time range. It does not work well

* for metrics that have recently stopped being collected.

curr_time = pg_cache_oldest_time_in_range(ctx, rd_iter->state->rrdeng_uuid,

start_time * USEC_PER_SEC, end_time * USEC_PER_SEC);

if (INVALID_TIME != curr_time && curr_time < min_time) {

rd = rd_iter;

min_time = curr_time;

}

rrdset_unlock(st);

if (NULL == rd) {

return 1;

}

pages_nr = pg_cache_preload(ctx, rd->state->rrdeng_uuid, start_time * USEC_PER_SEC, end_time * USEC_PER_SEC,

&page_info_array, &page_index);

if (pages_nr) {

/* conservative allocation, will reduce the size later if necessary */

region_info_array = mallocz(sizeof(*region_info_array) * pages_nr);

}

is_first_region_initialized = 0;

region_points = 0;

/* pages loop */

for (i = 0, curr = NULL, prev = NULL ; i < pages_nr ; ++i) {

old_prev = prev;

prev = curr;

curr = &page_info_array[i];

*pginfo_to_points(curr) = 0; /* initialize to invalid page */

*pginfo_to_dt(curr) = 0; /* no known data collection interval yet */

if (unlikely(INVALID_TIME == curr->start_time || INVALID_TIME == curr->end_time ||

curr->end_time < curr->start_time)) {

info("Ignoring page with invalid timestamps.");

prev = old_prev;

continue;

}

page_entries = curr->page_length / sizeof(storage_number);

assert(0 != page_entries);

if (likely(1 != page_entries)) {

dt = (curr->end_time - curr->start_time) / (page_entries - 1);

*pginfo_to_dt(curr) = ROUND_USEC_TO_SEC(dt);

if (unlikely(0 == *pginfo_to_dt(curr)))

*pginfo_to_dt(curr) = 1;

} else {

dt = 0;

}

for (j = 0, page_points = 0 ; j < page_entries ; ++j) {

uint8_t is_metric_out_of_order, is_metric_earlier_than_range;

is_metric_earlier_than_range = 0;

is_metric_out_of_order = 0;

current_position_time = curr->start_time + j * dt;

now = current_position_time / USEC_PER_SEC;

if (now > end_time) { /* there will be no more pages in the time range */

break;

}

if (now < start_time)

is_metric_earlier_than_range = 1;

if (unlikely(current_position_time < max_time)) /* just went back in time */

is_metric_out_of_order = 1;

if (is_metric_earlier_than_range || unlikely(is_metric_out_of_order)) {

if (unlikely(is_metric_out_of_order))

info("Ignoring metric with out of order timestamp.");

continue; /* next entry */

}

/* here is a valid metric */

++page_points;

region_info_array[regions - 1].points = ++region_points;

max_time = current_position_time;

if (1 == page_points)

first_valid_time_in_page = current_position_time;

if (unlikely(!is_first_region_initialized)) {

assert(1 == regions);

/* this is the first region */

region_info_array[0].start_time = current_position_time;

is_first_region_initialized = 1;

}

*pginfo_to_points(curr) = page_points;

if (0 == page_points) {

prev = old_prev;

continue;

}

if (unlikely(0 == *pginfo_to_dt(curr))) { /* unknown data collection interval */

assert(1 == page_points);

if (likely(NULL != prev)) { /* get interval from previous page */

*pginfo_to_dt(curr) = *pginfo_to_dt(prev);

} else { /* there is no previous page in the query */

struct rrdeng_page_info db_page_info;

/* go to database */

pg_cache_get_filtered_info_prev(ctx, page_index, curr->start_time,

metrics_with_known_interval, &db_page_info);

if (unlikely(db_page_info.start_time == INVALID_TIME || db_page_info.end_time == INVALID_TIME ||

0 == db_page_info.page_length)) { /* nothing in the database, default to update_every */

*pginfo_to_dt(curr) = rd->update_every;

} else {

unsigned db_entries;

usec_t db_dt;

db_entries = db_page_info.page_length / sizeof(storage_number);

db_dt = (db_page_info.end_time - db_page_info.start_time) / (db_entries - 1);

*pginfo_to_dt(curr) = ROUND_USEC_TO_SEC(db_dt);

if (unlikely(0 == *pginfo_to_dt(curr)))

*pginfo_to_dt(curr) = 1;

}

if (likely(prev) && unlikely(*pginfo_to_dt(curr) != *pginfo_to_dt(prev))) {

info("Data collection interval change detected in query: %"PRIu32" -> %"PRIu32,

*pginfo_to_dt(prev), *pginfo_to_dt(curr));

region_info_array[regions++ - 1].points -= page_points;

region_info_array[regions - 1].points = region_points = page_points;

region_info_array[regions - 1].start_time = first_valid_time_in_page;

}

if (*pginfo_to_dt(curr) > max_interval)

max_interval = *pginfo_to_dt(curr);

region_info_array[regions - 1].update_every = *pginfo_to_dt(curr);

}

if (page_info_array)

freez(page_info_array);

if (region_info_array) {

if (likely(is_first_region_initialized)) {

/* free unnecessary memory */

region_info_array = reallocz(region_info_array, sizeof(*region_info_array) * regions);

*region_info_arrayp = region_info_array;

*max_intervalp = max_interval;

} else {

/* empty result */

freez(region_info_array);

}

return regions;

}

* Gets a handle for loading metrics from the database.

* The handle must be released with rrdeng_load_metric_final().

void rrdeng_load_metric_init(RRDDIM *rd, struct rrddim_query_handle *rrdimm_handle, time_t start_time, time_t end_time)

{

struct rrdeng_query_handle *handle;

struct rrdengine_instance *ctx;

unsigned pages_nr;

ctx = rd->rrdset->rrdhost->rrdeng_ctx;

rrdimm_handle->start_time = start_time;

rrdimm_handle->end_time = end_time;

handle = &rrdimm_handle->rrdeng;

handle->next_page_time = start_time;

handle->now = start_time;

handle->position = 0;

handle->ctx = ctx;

handle->descr = NULL;

pages_nr = pg_cache_preload(ctx, rd->state->rrdeng_uuid, start_time * USEC_PER_SEC, end_time * USEC_PER_SEC,

NULL, &handle->page_index);

if (unlikely(NULL == handle->page_index || 0 == pages_nr))

/* there are no metrics to load */

handle->next_page_time = INVALID_TIME;

}

/* Returns the metric and sets its timestamp into current_time */

storage_number rrdeng_load_metric_next(struct rrddim_query_handle *rrdimm_handle, time_t *current_time)

{

struct rrdeng_query_handle *handle;

struct rrdengine_instance *ctx;

struct rrdeng_page_descr *descr;

storage_number *page, ret;

unsigned position, entries;

usec_t next_page_time, current_position_time, page_end_time;

uint32_t page_length;

handle = &rrdimm_handle->rrdeng;

if (unlikely(INVALID_TIME == handle->next_page_time)) {

return SN_EMPTY_SLOT;

}

ctx = handle->ctx;

if (unlikely(NULL == (descr = handle->descr))) {

/* it's the first call */

next_page_time = handle->next_page_time * USEC_PER_SEC;

} else {

pg_cache_atomic_get_pg_info(descr, &page_end_time, &page_length);

}

position = handle->position + 1;

if (unlikely(NULL == descr ||

position >= (page_length / sizeof(storage_number)))) {

/* We need to get a new page */

if (descr) {

/* Drop old page's reference */

#ifdef NETDATA_INTERNAL_CHECKS

rrd_stat_atomic_add(&ctx->stats.metric_API_consumers, -1);

#endif

pg_cache_put(ctx, descr);

handle->descr = NULL;

handle->next_page_time = (page_end_time / USEC_PER_SEC) + 1;

if (unlikely(handle->next_page_time > rrdimm_handle->end_time)) {

goto no_more_metrics;

}

next_page_time = handle->next_page_time * USEC_PER_SEC;

}

descr = pg_cache_lookup_next(ctx, handle->page_index, &handle->page_index->id,

next_page_time, rrdimm_handle->end_time * USEC_PER_SEC);

if (NULL == descr) {

goto no_more_metrics;

}

#ifdef NETDATA_INTERNAL_CHECKS

rrd_stat_atomic_add(&ctx->stats.metric_API_consumers, 1);

#endif

handle->descr = descr;

pg_cache_atomic_get_pg_info(descr, &page_end_time, &page_length);

if (unlikely(INVALID_TIME == descr->start_time ||

INVALID_TIME == page_end_time)) {

goto no_more_metrics;

}

if (unlikely(descr->start_time != page_end_time && next_page_time > descr->start_time)) {

/* we're in the middle of the page somewhere */

entries = page_length / sizeof(storage_number);

position = ((uint64_t)(next_page_time - descr->start_time)) * (entries - 1) /

(page_end_time - descr->start_time);

} else {

position = 0;

}

page = descr->pg_cache_descr->page;

ret = page[position];

entries = page_length / sizeof(storage_number);

if (entries > 1) {

usec_t dt;

dt = (page_end_time - descr->start_time) / (entries - 1);

current_position_time = descr->start_time + position * dt;

} else {

current_position_time = descr->start_time;

}

handle->position = position;

handle->now = current_position_time / USEC_PER_SEC;

/* assert(handle->now >= rrdimm_handle->start_time && handle->now <= rrdimm_handle->end_time);

The above assertion is an approximation and needs to take update_every into account */

if (unlikely(handle->now >= rrdimm_handle->end_time)) {

/* next calls will not load any more metrics */

handle->next_page_time = INVALID_TIME;

}

*current_time = handle->now;

return ret;

no_more_metrics:

handle->next_page_time = INVALID_TIME;

return SN_EMPTY_SLOT;

}

int rrdeng_load_metric_is_finished(struct rrddim_query_handle *rrdimm_handle)

{

struct rrdeng_query_handle *handle;

handle = &rrdimm_handle->rrdeng;

return (INVALID_TIME == handle->next_page_time);

}

* Releases the database reference from the handle for loading metrics.

void rrdeng_load_metric_finalize(struct rrddim_query_handle *rrdimm_handle)

{

struct rrdeng_query_handle *handle;

struct rrdengine_instance *ctx;

struct rrdeng_page_descr *descr;

handle = &rrdimm_handle->rrdeng;

ctx = handle->ctx;

descr = handle->descr;

if (descr) {

#ifdef NETDATA_INTERNAL_CHECKS

rrd_stat_atomic_add(&ctx->stats.metric_API_consumers, -1);

#endif

pg_cache_put(ctx, descr);

}

time_t rrdeng_metric_latest_time(RRDDIM *rd)

{

struct rrdeng_collect_handle *handle;

struct pg_cache_page_index *page_index;

handle = &rd->state->handle.rrdeng;

page_index = handle->page_index;

return page_index->latest_time / USEC_PER_SEC;

}

time_t rrdeng_metric_oldest_time(RRDDIM *rd)

{

struct rrdeng_collect_handle *handle;

struct pg_cache_page_index *page_index;

handle = &rd->state->handle.rrdeng;

page_index = handle->page_index;

return page_index->oldest_time / USEC_PER_SEC;

}

/* Also gets a reference for the page */

void *rrdeng_create_page(struct rrdengine_instance *ctx, uuid_t *id, struct rrdeng_page_descr **ret_descr)

{

struct rrdeng_page_descr *descr;

struct page_cache_descr *pg_cache_descr;

void *page;

/* TODO: check maximum number of pages in page cache limit */

descr = pg_cache_create_descr();

descr->id = id; /* TODO: add page type: metric, log, something? */

page = mallocz(RRDENG_BLOCK_SIZE); /*TODO: add page size */

rrdeng_page_descr_mutex_lock(ctx, descr);

pg_cache_descr = descr->pg_cache_descr;

pg_cache_descr->page = page;

pg_cache_descr->flags = RRD_PAGE_DIRTY /*| RRD_PAGE_LOCKED */ | RRD_PAGE_POPULATED /* | BEING_COLLECTED */;

pg_cache_descr->refcnt = 1;

debug(D_RRDENGINE, "Created new page:");

if (unlikely(debug_flags & D_RRDENGINE))

print_page_cache_descr(descr);

rrdeng_page_descr_mutex_unlock(ctx, descr);

*ret_descr = descr;

return page;

}

/* The page must not be empty */

void rrdeng_commit_page(struct rrdengine_instance *ctx, struct rrdeng_page_descr *descr,

Word_t page_correlation_id)

{

struct page_cache *pg_cache = &ctx->pg_cache;

Pvoid_t *PValue;

unsigned nr_committed_pages;

if (unlikely(NULL == descr)) {

debug(D_RRDENGINE, "%s: page descriptor is NULL, page has already been force-committed.", __func__);

return;

}

assert(descr->page_length);

uv_rwlock_wrlock(&pg_cache->committed_page_index.lock);

PValue = JudyLIns(&pg_cache->committed_page_index.JudyL_array, page_correlation_id, PJE0);

*PValue = descr;

nr_committed_pages = ++pg_cache->committed_page_index.nr_committed_pages;

uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock);

if (nr_committed_pages >= pg_cache_hard_limit(ctx) / 2) {

/* over 50% of pages have not been committed yet */

if (ctx->drop_metrics_under_page_cache_pressure &&

nr_committed_pages >= pg_cache_committed_hard_limit(ctx)) {

/* 100% of pages are dirty */

struct rrdeng_cmd cmd;

cmd.opcode = RRDENG_INVALIDATE_OLDEST_MEMORY_PAGE;

rrdeng_enq_cmd(&ctx->worker_config, &cmd);

} else {

if (0 == (unsigned long) ctx->stats.pg_cache_over_half_dirty_events) {

/* only print the first time */

errno = 0;

error("Failed to flush dirty buffers quickly enough in dbengine instance \"%s\". "

"Metric data at risk of not being stored in the database, "

"please reduce disk load or use a faster disk.", ctx->dbfiles_path);

}

rrd_stat_atomic_add(&ctx->stats.pg_cache_over_half_dirty_events, 1);

rrd_stat_atomic_add(&global_pg_cache_over_half_dirty_events, 1);

}

pg_cache_put(ctx, descr);

}

/* Gets a reference for the page */

void *rrdeng_get_latest_page(struct rrdengine_instance *ctx, uuid_t *id, void **handle)

{

struct rrdeng_page_descr *descr;

struct page_cache_descr *pg_cache_descr;

debug(D_RRDENGINE, "Reading existing page:");

descr = pg_cache_lookup(ctx, NULL, id, INVALID_TIME);

if (NULL == descr) {

*handle = NULL;

return NULL;

}

*handle = descr;

pg_cache_descr = descr->pg_cache_descr;

return pg_cache_descr->page;

}

/* Gets a reference for the page */

void *rrdeng_get_page(struct rrdengine_instance *ctx, uuid_t *id, usec_t point_in_time, void **handle)

{

struct rrdeng_page_descr *descr;

struct page_cache_descr *pg_cache_descr;

debug(D_RRDENGINE, "Reading existing page:");

descr = pg_cache_lookup(ctx, NULL, id, point_in_time);

if (NULL == descr) {

*handle = NULL;

return NULL;

}

*handle = descr;

pg_cache_descr = descr->pg_cache_descr;

return pg_cache_descr->page;

}

* Gathers Database Engine statistics.

* Careful when modifying this function.

* You must not change the indices of the statistics or user code will break.

* You must not exceed RRDENG_NR_STATS or it will crash.

void rrdeng_get_37_statistics(struct rrdengine_instance *ctx, unsigned long long *array)

{

struct page_cache *pg_cache = &ctx->pg_cache;

array[0] = (uint64_t)ctx->stats.metric_API_producers;

array[1] = (uint64_t)ctx->stats.metric_API_consumers;

array[2] = (uint64_t)pg_cache->page_descriptors;

array[3] = (uint64_t)pg_cache->populated_pages;

array[4] = (uint64_t)pg_cache->committed_page_index.nr_committed_pages;

array[5] = (uint64_t)ctx->stats.pg_cache_insertions;

array[6] = (uint64_t)ctx->stats.pg_cache_deletions;

array[7] = (uint64_t)ctx->stats.pg_cache_hits;

array[8] = (uint64_t)ctx->stats.pg_cache_misses;

array[9] = (uint64_t)ctx->stats.pg_cache_backfills;

array[10] = (uint64_t)ctx->stats.pg_cache_evictions;

array[11] = (uint64_t)ctx->stats.before_compress_bytes;

array[12] = (uint64_t)ctx->stats.after_compress_bytes;

array[13] = (uint64_t)ctx->stats.before_decompress_bytes;

array[14] = (uint64_t)ctx->stats.after_decompress_bytes;

array[15] = (uint64_t)ctx->stats.io_write_bytes;

array[16] = (uint64_t)ctx->stats.io_write_requests;

array[17] = (uint64_t)ctx->stats.io_read_bytes;

array[18] = (uint64_t)ctx->stats.io_read_requests;

array[19] = (uint64_t)ctx->stats.io_write_extent_bytes;

array[20] = (uint64_t)ctx->stats.io_write_extents;

array[21] = (uint64_t)ctx->stats.io_read_extent_bytes;

array[22] = (uint64_t)ctx->stats.io_read_extents;

array[23] = (uint64_t)ctx->stats.datafile_creations;

array[24] = (uint64_t)ctx->stats.datafile_deletions;

array[25] = (uint64_t)ctx->stats.journalfile_creations;

array[26] = (uint64_t)ctx->stats.journalfile_deletions;

array[27] = (uint64_t)ctx->stats.page_cache_descriptors;

array[28] = (uint64_t)ctx->stats.io_errors;

array[29] = (uint64_t)ctx->stats.fs_errors;

array[30] = (uint64_t)global_io_errors;

array[31] = (uint64_t)global_fs_errors;

array[32] = (uint64_t)rrdeng_reserved_file_descriptors;

array[33] = (uint64_t)ctx->stats.pg_cache_over_half_dirty_events;

array[34] = (uint64_t)global_pg_cache_over_half_dirty_events;

array[35] = (uint64_t)ctx->stats.flushing_pressure_page_deletions;

array[36] = (uint64_t)global_flushing_pressure_page_deletions;

assert(RRDENG_NR_STATS == 37);

}

/* Releases reference to page */

void rrdeng_put_page(struct rrdengine_instance *ctx, void *handle)

{

(void)ctx;

pg_cache_put(ctx, (struct rrdeng_page_descr *)handle);

}

* Returns 0 on success, negative on error

int rrdeng_init(struct rrdengine_instance **ctxp, char *dbfiles_path, unsigned page_cache_mb, unsigned disk_space_mb)

{

struct rrdengine_instance *ctx;

int error;

uint32_t max_open_files;

max_open_files = rlimit_nofile.rlim_cur / 4;

/* reserve RRDENG_FD_BUDGET_PER_INSTANCE file descriptors for this instance */

rrd_stat_atomic_add(&rrdeng_reserved_file_descriptors, RRDENG_FD_BUDGET_PER_INSTANCE);

if (rrdeng_reserved_file_descriptors > max_open_files) {

error("Exceeded the budget of available file descriptors (%u/%u), cannot create new dbengine instance.",

(unsigned)rrdeng_reserved_file_descriptors, (unsigned)max_open_files);

rrd_stat_atomic_add(&global_fs_errors, 1);

rrd_stat_atomic_add(&rrdeng_reserved_file_descriptors, -RRDENG_FD_BUDGET_PER_INSTANCE);

return UV_EMFILE;

}

if (NULL == ctxp) {

/* for testing */

ctx = &default_global_ctx;

memset(ctx, 0, sizeof(*ctx));

} else {

*ctxp = ctx = callocz(1, sizeof(*ctx));

}

ctx->global_compress_alg = RRD_LZ4;

if (page_cache_mb < RRDENG_MIN_PAGE_CACHE_SIZE_MB)

page_cache_mb = RRDENG_MIN_PAGE_CACHE_SIZE_MB;

ctx->max_cache_pages = page_cache_mb * (1048576LU / RRDENG_BLOCK_SIZE);

/* try to keep 5% of the page cache free */

ctx->cache_pages_low_watermark = (ctx->max_cache_pages * 95LLU) / 100;

if (disk_space_mb < RRDENG_MIN_DISK_SPACE_MB)

disk_space_mb = RRDENG_MIN_DISK_SPACE_MB;

ctx->max_disk_space = disk_space_mb * 1048576LLU;

strncpyz(ctx->dbfiles_path, dbfiles_path, sizeof(ctx->dbfiles_path) - 1);

ctx->dbfiles_path[sizeof(ctx->dbfiles_path) - 1] = '\0';

ctx->drop_metrics_under_page_cache_pressure = rrdeng_drop_metrics_under_page_cache_pressure;

ctx->metric_API_max_producers = 0;

memset(&ctx->worker_config, 0, sizeof(ctx->worker_config));

ctx->worker_config.ctx = ctx;

init_page_cache(ctx);

init_commit_log(ctx);

error = init_rrd_files(ctx);

if (error) {

goto error_after_init_rrd_files;

}

init_completion(&ctx->rrdengine_completion);

assert(0 == uv_thread_create(&ctx->worker_config.thread, rrdeng_worker, &ctx->worker_config));

/* wait for worker thread to initialize */

wait_for_completion(&ctx->rrdengine_completion);

destroy_completion(&ctx->rrdengine_completion);

uv_thread_set_name_np(ctx->worker_config.thread, "DBENGINE");

if (ctx->worker_config.error) {

goto error_after_rrdeng_worker;

}

return 0;

error_after_rrdeng_worker:

finalize_rrd_files(ctx);

error_after_init_rrd_files:

free_page_cache(ctx);

if (ctx != &default_global_ctx) {

freez(ctx);

*ctxp = NULL;

}

rrd_stat_atomic_add(&rrdeng_reserved_file_descriptors, -RRDENG_FD_BUDGET_PER_INSTANCE);

return UV_EIO;

}

* Returns 0 on success, 1 on error

int rrdeng_exit(struct rrdengine_instance *ctx)

{

struct rrdeng_cmd cmd;

if (NULL == ctx) {

return 1;

}

/* TODO: add page to page cache */

cmd.opcode = RRDENG_SHUTDOWN;

rrdeng_enq_cmd(&ctx->worker_config, &cmd);

assert(0 == uv_thread_join(&ctx->worker_config.thread));

finalize_rrd_files(ctx);

free_page_cache(ctx);

if (ctx != &default_global_ctx) {

freez(ctx);

}

rrd_stat_atomic_add(&rrdeng_reserved_file_descriptors, -RRDENG_FD_BUDGET_PER_INSTANCE);

return 0;

}

netdata/database/engine/rrdengineapi.c at master · araemo/netdata · GitHub

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