diff options
Diffstat (limited to 'database/engine/rrdengineapi.c')
| -rwxr-xr-x | database/engine/rrdengineapi.c | 1361 |
1 files changed, 1361 insertions, 0 deletions
diff --git a/database/engine/rrdengineapi.c b/database/engine/rrdengineapi.c new file mode 100755 index 00000000..1ddce524 --- /dev/null +++ b/database/engine/rrdengineapi.c @@ -0,0 +1,1361 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "database/engine/rrddiskprotocol.h" +#include "rrdengine.h" + +/* Default global database instance */ +struct rrdengine_instance multidb_ctx_storage_tier0; +struct rrdengine_instance multidb_ctx_storage_tier1; +struct rrdengine_instance multidb_ctx_storage_tier2; +struct rrdengine_instance multidb_ctx_storage_tier3; +struct rrdengine_instance multidb_ctx_storage_tier4; + +#define mrg_metric_ctx(metric) (struct rrdengine_instance *)mrg_metric_section(main_mrg, metric) + +#if RRD_STORAGE_TIERS != 5 +#error RRD_STORAGE_TIERS is not 5 - you need to add allocations here +#endif +struct rrdengine_instance *multidb_ctx[RRD_STORAGE_TIERS]; +uint8_t tier_page_type[RRD_STORAGE_TIERS] = {PAGE_METRICS, PAGE_TIER, PAGE_TIER, PAGE_TIER, PAGE_TIER}; + +#if defined(ENV32BIT) +size_t tier_page_size[RRD_STORAGE_TIERS] = {2048, 1024, 192, 192, 192}; +#else +size_t tier_page_size[RRD_STORAGE_TIERS] = {4096, 2048, 384, 384, 384}; +#endif + +#if PAGE_TYPE_MAX != 2 +#error PAGE_TYPE_MAX is not 2 - you need to add allocations here +#endif + +size_t page_type_size[256] = { + [PAGE_METRICS] = sizeof(storage_number), + [PAGE_TIER] = sizeof(storage_number_tier1_t), + [PAGE_GORILLA_METRICS] = sizeof(storage_number) +}; + +__attribute__((constructor)) void initialize_multidb_ctx(void) { + multidb_ctx[0] = &multidb_ctx_storage_tier0; + multidb_ctx[1] = &multidb_ctx_storage_tier1; + multidb_ctx[2] = &multidb_ctx_storage_tier2; + multidb_ctx[3] = &multidb_ctx_storage_tier3; + multidb_ctx[4] = &multidb_ctx_storage_tier4; +} + +int db_engine_journal_check = 0; +int default_rrdeng_disk_quota_mb = 256; +int default_multidb_disk_quota_mb = 256; + +#if defined(ENV32BIT) +int default_rrdeng_page_cache_mb = 16; +int default_rrdeng_extent_cache_mb = 0; +#else +int default_rrdeng_page_cache_mb = 32; +int default_rrdeng_extent_cache_mb = 0; +#endif + +// ---------------------------------------------------------------------------- +// metrics groups + +static inline void rrdeng_page_alignment_acquire(struct pg_alignment *pa) { + if(unlikely(!pa)) return; + __atomic_add_fetch(&pa->refcount, 1, __ATOMIC_SEQ_CST); +} + +static inline bool rrdeng_page_alignment_release(struct pg_alignment *pa) { + if(unlikely(!pa)) return true; + + if(__atomic_sub_fetch(&pa->refcount, 1, __ATOMIC_SEQ_CST) == 0) { + freez(pa); + return true; + } + + return false; +} + +// charts call this +STORAGE_METRICS_GROUP *rrdeng_metrics_group_get(STORAGE_INSTANCE *db_instance __maybe_unused, uuid_t *uuid __maybe_unused) { + struct pg_alignment *pa = callocz(1, sizeof(struct pg_alignment)); + rrdeng_page_alignment_acquire(pa); + return (STORAGE_METRICS_GROUP *)pa; +} + +// charts call this +void rrdeng_metrics_group_release(STORAGE_INSTANCE *db_instance __maybe_unused, STORAGE_METRICS_GROUP *smg) { + if(unlikely(!smg)) return; + + struct pg_alignment *pa = (struct pg_alignment *)smg; + rrdeng_page_alignment_release(pa); +} + +// ---------------------------------------------------------------------------- +// metric handle for legacy dbs + +/* This UUID is not unique across hosts */ +void rrdeng_generate_legacy_uuid(const char *dim_id, const char *chart_id, uuid_t *ret_uuid) +{ + EVP_MD_CTX *evpctx; + unsigned char hash_value[EVP_MAX_MD_SIZE]; + unsigned int hash_len; + + evpctx = EVP_MD_CTX_create(); + EVP_DigestInit_ex(evpctx, EVP_sha256(), NULL); + EVP_DigestUpdate(evpctx, dim_id, strlen(dim_id)); + EVP_DigestUpdate(evpctx, chart_id, strlen(chart_id)); + EVP_DigestFinal_ex(evpctx, hash_value, &hash_len); + EVP_MD_CTX_destroy(evpctx); + fatal_assert(hash_len > sizeof(uuid_t)); + memcpy(ret_uuid, hash_value, sizeof(uuid_t)); +} + +static METRIC *rrdeng_metric_get_legacy(STORAGE_INSTANCE *db_instance, const char *rd_id, const char *st_id) { + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + uuid_t legacy_uuid; + rrdeng_generate_legacy_uuid(rd_id, st_id, &legacy_uuid); + return mrg_metric_get_and_acquire(main_mrg, &legacy_uuid, (Word_t) ctx); +} + +// ---------------------------------------------------------------------------- +// metric handle + +void rrdeng_metric_release(STORAGE_METRIC_HANDLE *db_metric_handle) { + METRIC *metric = (METRIC *)db_metric_handle; + mrg_metric_release(main_mrg, metric); +} + +STORAGE_METRIC_HANDLE *rrdeng_metric_dup(STORAGE_METRIC_HANDLE *db_metric_handle) { + METRIC *metric = (METRIC *)db_metric_handle; + return (STORAGE_METRIC_HANDLE *) mrg_metric_dup(main_mrg, metric); +} + +STORAGE_METRIC_HANDLE *rrdeng_metric_get(STORAGE_INSTANCE *db_instance, uuid_t *uuid) { + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + return (STORAGE_METRIC_HANDLE *) mrg_metric_get_and_acquire(main_mrg, uuid, (Word_t) ctx); +} + +static METRIC *rrdeng_metric_create(STORAGE_INSTANCE *db_instance, uuid_t *uuid) { + internal_fatal(!db_instance, "DBENGINE: db_instance is NULL"); + + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + MRG_ENTRY entry = { + .uuid = uuid, + .section = (Word_t)ctx, + .first_time_s = 0, + .last_time_s = 0, + .latest_update_every_s = 0, + }; + + METRIC *metric = mrg_metric_add_and_acquire(main_mrg, entry, NULL); + return metric; +} + +STORAGE_METRIC_HANDLE *rrdeng_metric_get_or_create(RRDDIM *rd, STORAGE_INSTANCE *db_instance) { + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + METRIC *metric; + + metric = mrg_metric_get_and_acquire(main_mrg, &rd->metric_uuid, (Word_t) ctx); + + if(unlikely(!metric)) { + if(unlikely(ctx->config.legacy)) { + // this is a single host database + // generate uuid from the chart and dimensions ids + // and overwrite the one supplied by rrddim + metric = rrdeng_metric_get_legacy(db_instance, rrddim_id(rd), rrdset_id(rd->rrdset)); + if (metric) + uuid_copy(rd->metric_uuid, *mrg_metric_uuid(main_mrg, metric)); + } + + if(likely(!metric)) + metric = rrdeng_metric_create(db_instance, &rd->metric_uuid); + } + +#ifdef NETDATA_INTERNAL_CHECKS + if(uuid_memcmp(&rd->metric_uuid, mrg_metric_uuid(main_mrg, metric)) != 0) { + char uuid1[UUID_STR_LEN + 1]; + char uuid2[UUID_STR_LEN + 1]; + + uuid_unparse(rd->metric_uuid, uuid1); + uuid_unparse(*mrg_metric_uuid(main_mrg, metric), uuid2); + fatal("DBENGINE: uuids do not match, asked for metric '%s', but got metric '%s'", uuid1, uuid2); + } + + if(mrg_metric_ctx(metric) != ctx) + fatal("DBENGINE: mixed up db instances, asked for metric from %p, got from %p", + ctx, mrg_metric_ctx(metric)); +#endif + + return (STORAGE_METRIC_HANDLE *)metric; +} + + +// ---------------------------------------------------------------------------- +// collect ops + +static inline void check_and_fix_mrg_update_every(struct rrdeng_collect_handle *handle) { + if(unlikely((time_t)(handle->update_every_ut / USEC_PER_SEC) != mrg_metric_get_update_every_s(main_mrg, handle->metric))) { + internal_error(true, "DBENGINE: collection handle has update every %ld, but the metric registry has %ld. Fixing it.", + (time_t)(handle->update_every_ut / USEC_PER_SEC), mrg_metric_get_update_every_s(main_mrg, handle->metric)); + + if(unlikely(!handle->update_every_ut)) + handle->update_every_ut = (usec_t)mrg_metric_get_update_every_s(main_mrg, handle->metric) * USEC_PER_SEC; + else + mrg_metric_set_update_every(main_mrg, handle->metric, (time_t)(handle->update_every_ut / USEC_PER_SEC)); + } +} + +static inline bool check_completed_page_consistency(struct rrdeng_collect_handle *handle __maybe_unused) { +#ifdef NETDATA_INTERNAL_CHECKS + if (unlikely(!handle->pgc_page || !handle->page_entries_max || !handle->page_position || !handle->page_end_time_ut)) + return false; + + struct rrdengine_instance *ctx = mrg_metric_ctx(handle->metric); + + uuid_t *uuid = mrg_metric_uuid(main_mrg, handle->metric); + time_t start_time_s = pgc_page_start_time_s(handle->pgc_page); + time_t end_time_s = pgc_page_end_time_s(handle->pgc_page); + time_t update_every_s = pgc_page_update_every_s(handle->pgc_page); + size_t page_length = handle->page_position * CTX_POINT_SIZE_BYTES(ctx); + size_t entries = handle->page_position; + time_t overwrite_zero_update_every_s = (time_t)(handle->update_every_ut / USEC_PER_SEC); + + if(end_time_s > max_acceptable_collected_time()) + handle->page_flags |= RRDENG_PAGE_COMPLETED_IN_FUTURE; + + VALIDATED_PAGE_DESCRIPTOR vd = validate_page( + uuid, + start_time_s, + end_time_s, + update_every_s, + page_length, + ctx->config.page_type, + entries, + 0, // do not check for future timestamps - we inherit the timestamps of the children + overwrite_zero_update_every_s, + false, + "collected", + handle->page_flags); + + return vd.is_valid; +#else + return true; +#endif +} + +/* + * Gets a handle for storing metrics to the database. + * The handle must be released with rrdeng_store_metric_final(). + */ +STORAGE_COLLECT_HANDLE *rrdeng_store_metric_init(STORAGE_METRIC_HANDLE *db_metric_handle, uint32_t update_every, STORAGE_METRICS_GROUP *smg) { + METRIC *metric = (METRIC *)db_metric_handle; + struct rrdengine_instance *ctx = mrg_metric_ctx(metric); + + bool is_1st_metric_writer = true; + if(!mrg_metric_set_writer(main_mrg, metric)) { + is_1st_metric_writer = false; + char uuid[UUID_STR_LEN + 1]; + uuid_unparse(*mrg_metric_uuid(main_mrg, metric), uuid); + netdata_log_error("DBENGINE: metric '%s' is already collected and should not be collected twice - expect gaps on the charts", uuid); + } + + metric = mrg_metric_dup(main_mrg, metric); + + struct rrdeng_collect_handle *handle; + + handle = callocz(1, sizeof(struct rrdeng_collect_handle)); + handle->common.backend = STORAGE_ENGINE_BACKEND_DBENGINE; + handle->metric = metric; + + handle->pgc_page = NULL; + handle->page_data = NULL; + handle->page_data_size = 0; + + handle->page_position = 0; + handle->page_entries_max = 0; + handle->update_every_ut = (usec_t)update_every * USEC_PER_SEC; + handle->options = is_1st_metric_writer ? RRDENG_1ST_METRIC_WRITER : 0; + + __atomic_add_fetch(&ctx->atomic.collectors_running, 1, __ATOMIC_RELAXED); + if(!is_1st_metric_writer) + __atomic_add_fetch(&ctx->atomic.collectors_running_duplicate, 1, __ATOMIC_RELAXED); + + mrg_metric_set_update_every(main_mrg, metric, update_every); + + handle->alignment = (struct pg_alignment *)smg; + rrdeng_page_alignment_acquire(handle->alignment); + + // this is important! + // if we don't set the page_end_time_ut during the first collection + // data collection may be able to go back in time and during the addition of new pages + // clean pages may be found matching ours! + + time_t db_first_time_s, db_last_time_s, db_update_every_s; + mrg_metric_get_retention(main_mrg, metric, &db_first_time_s, &db_last_time_s, &db_update_every_s); + handle->page_end_time_ut = (usec_t)db_last_time_s * USEC_PER_SEC; + + return (STORAGE_COLLECT_HANDLE *)handle; +} + +void rrdeng_store_metric_flush_current_page(STORAGE_COLLECT_HANDLE *collection_handle) { + struct rrdeng_collect_handle *handle = (struct rrdeng_collect_handle *)collection_handle; + + if (unlikely(!handle->pgc_page)) + return; + + if(pgd_is_empty(handle->page_data)) + pgc_page_to_clean_evict_or_release(main_cache, handle->pgc_page); + + else { + check_completed_page_consistency(handle); + mrg_metric_set_clean_latest_time_s(main_mrg, handle->metric, pgc_page_end_time_s(handle->pgc_page)); + pgc_page_hot_to_dirty_and_release(main_cache, handle->pgc_page); + } + + mrg_metric_set_hot_latest_time_s(main_mrg, handle->metric, 0); + + handle->pgc_page = NULL; + handle->page_flags = 0; + handle->page_position = 0; + handle->page_entries_max = 0; + handle->page_data = NULL; + handle->page_data_size = 0; + + // important! + // we should never zero page end time ut, because this will allow + // collection to go back in time + // handle->page_end_time_ut = 0; + // handle->page_start_time_ut; + + check_and_fix_mrg_update_every(handle); + + timing_step(TIMING_STEP_DBENGINE_FLUSH_PAGE); +} + +static void rrdeng_store_metric_create_new_page(struct rrdeng_collect_handle *handle, + struct rrdengine_instance *ctx, + usec_t point_in_time_ut, + PGD *data, + size_t data_size) { + time_t point_in_time_s = (time_t)(point_in_time_ut / USEC_PER_SEC); + const time_t update_every_s = (time_t)(handle->update_every_ut / USEC_PER_SEC); + + PGC_ENTRY page_entry = { + .section = (Word_t) ctx, + .metric_id = mrg_metric_id(main_mrg, handle->metric), + .start_time_s = point_in_time_s, + .end_time_s = point_in_time_s, + .size = data_size, + .data = data, + .update_every_s = (uint32_t) update_every_s, + .hot = true + }; + + size_t conflicts = 0; + bool added = true; + PGC_PAGE *pgc_page = pgc_page_add_and_acquire(main_cache, page_entry, &added); + while (unlikely(!added)) { + conflicts++; + + char uuid[UUID_STR_LEN + 1]; + uuid_unparse(*mrg_metric_uuid(main_mrg, handle->metric), uuid); + +#ifdef NETDATA_INTERNAL_CHECKS + internal_error(true, +#else + nd_log_limit_static_global_var(erl, 1, 0); + nd_log_limit(&erl, NDLS_DAEMON, NDLP_WARNING, +#endif + "DBENGINE: metric '%s' new page from %ld to %ld, update every %ld, has a conflict in main cache " + "with existing %s%s page from %ld to %ld, update every %ld - " + "is it collected more than once?", + uuid, + page_entry.start_time_s, page_entry.end_time_s, (time_t)page_entry.update_every_s, + pgc_is_page_hot(pgc_page) ? "hot" : "not-hot", + pgc_page_data(pgc_page) == PGD_EMPTY ? " gap" : "", + pgc_page_start_time_s(pgc_page), pgc_page_end_time_s(pgc_page), pgc_page_update_every_s(pgc_page) + ); + + pgc_page_release(main_cache, pgc_page); + + point_in_time_ut -= handle->update_every_ut; + point_in_time_s = (time_t)(point_in_time_ut / USEC_PER_SEC); + page_entry.start_time_s = point_in_time_s; + page_entry.end_time_s = point_in_time_s; + pgc_page = pgc_page_add_and_acquire(main_cache, page_entry, &added); + } + + handle->page_entries_max = data_size / CTX_POINT_SIZE_BYTES(ctx); + handle->page_start_time_ut = point_in_time_ut; + handle->page_end_time_ut = point_in_time_ut; + handle->page_position = 1; // zero is already in our data + handle->pgc_page = pgc_page; + handle->page_flags = conflicts? RRDENG_PAGE_CONFLICT : 0; + + if(point_in_time_s > max_acceptable_collected_time()) + handle->page_flags |= RRDENG_PAGE_CREATED_IN_FUTURE; + + check_and_fix_mrg_update_every(handle); + + timing_step(TIMING_STEP_DBENGINE_CREATE_NEW_PAGE); +} + +static size_t aligned_allocation_entries(size_t max_slots, size_t target_slot, time_t now_s) { + size_t slots = target_slot; + size_t pos = (now_s % max_slots); + + if(pos > slots) + slots += max_slots - pos; + + else if(pos < slots) + slots -= pos; + + else + slots = max_slots; + + return slots; +} + +static PGD *rrdeng_alloc_new_page_data(struct rrdeng_collect_handle *handle, size_t *data_size, usec_t point_in_time_ut) { + struct rrdengine_instance *ctx = mrg_metric_ctx(handle->metric); + + PGD *d = NULL; + + size_t max_size = tier_page_size[ctx->config.tier]; + size_t max_slots = max_size / CTX_POINT_SIZE_BYTES(ctx); + + size_t slots = aligned_allocation_entries( + max_slots, + indexing_partition((Word_t) handle->alignment, max_slots), + (time_t) (point_in_time_ut / USEC_PER_SEC) + ); + + if(slots < max_slots / 3) + slots = max_slots / 3; + + if(slots < 3) + slots = 3; + + size_t size = slots * CTX_POINT_SIZE_BYTES(ctx); + + // internal_error(true, "PAGE ALLOC %zu bytes (%zu max)", size, max_size); + + internal_fatal(slots < 3 || slots > max_slots, "ooops! wrong distribution of metrics across time"); + internal_fatal(size > tier_page_size[ctx->config.tier] || size < CTX_POINT_SIZE_BYTES(ctx) * 2, "ooops! wrong page size"); + + *data_size = size; + + switch (ctx->config.page_type) { + case PAGE_METRICS: + case PAGE_TIER: + d = pgd_create(ctx->config.page_type, slots); + break; + case PAGE_GORILLA_METRICS: + // ignore slots, and use the fixed number of slots per gorilla buffer. + // gorilla will automatically add more buffers if needed. + d = pgd_create(ctx->config.page_type, GORILLA_BUFFER_SLOTS); + break; + default: + fatal("Unknown page type: %uc\n", ctx->config.page_type); + } + + timing_step(TIMING_STEP_DBENGINE_PAGE_ALLOC); + return d; +} + +static void rrdeng_store_metric_append_point(STORAGE_COLLECT_HANDLE *collection_handle, + const usec_t point_in_time_ut, + const NETDATA_DOUBLE n, + const NETDATA_DOUBLE min_value, + const NETDATA_DOUBLE max_value, + const uint16_t count, + const uint16_t anomaly_count, + const SN_FLAGS flags) +{ + struct rrdeng_collect_handle *handle = (struct rrdeng_collect_handle *)collection_handle; + struct rrdengine_instance *ctx = mrg_metric_ctx(handle->metric); + + if(unlikely(!handle->page_data)) + handle->page_data = rrdeng_alloc_new_page_data(handle, &handle->page_data_size, point_in_time_ut); + + timing_step(TIMING_STEP_DBENGINE_CHECK_DATA); + + pgd_append_point(handle->page_data, + point_in_time_ut, + n, min_value, max_value, count, anomaly_count, flags, + handle->page_position); + + timing_step(TIMING_STEP_DBENGINE_PACK); + + if(unlikely(!handle->pgc_page)) { + rrdeng_store_metric_create_new_page(handle, ctx, point_in_time_ut, handle->page_data, handle->page_data_size); + // handle->position is set to 1 already + } + else { + // update an existing page + pgc_page_hot_set_end_time_s(main_cache, handle->pgc_page, (time_t) (point_in_time_ut / USEC_PER_SEC)); + handle->page_end_time_ut = point_in_time_ut; + + if(unlikely(++handle->page_position >= handle->page_entries_max)) { + internal_fatal(handle->page_position > handle->page_entries_max, "DBENGINE: exceeded page max number of points"); + handle->page_flags |= RRDENG_PAGE_FULL; + rrdeng_store_metric_flush_current_page(collection_handle); + } + } + + timing_step(TIMING_STEP_DBENGINE_PAGE_FIN); + + // update the metric information + mrg_metric_set_hot_latest_time_s(main_mrg, handle->metric, (time_t) (point_in_time_ut / USEC_PER_SEC)); + + timing_step(TIMING_STEP_DBENGINE_MRG_UPDATE); +} + +static void store_metric_next_error_log(struct rrdeng_collect_handle *handle __maybe_unused, usec_t point_in_time_ut __maybe_unused, const char *msg __maybe_unused) { +#ifdef NETDATA_INTERNAL_CHECKS + time_t point_in_time_s = (time_t)(point_in_time_ut / USEC_PER_SEC); + char uuid[UUID_STR_LEN + 1]; + uuid_unparse(*mrg_metric_uuid(main_mrg, handle->metric), uuid); + + BUFFER *wb = NULL; + if(handle->pgc_page && handle->page_flags) { + wb = buffer_create(0, NULL); + collect_page_flags_to_buffer(wb, handle->page_flags); + } + + nd_log_limit_static_global_var(erl, 1, 0); + nd_log_limit(&erl, NDLS_DAEMON, NDLP_NOTICE, + "DBENGINE: metric '%s' collected point at %ld, %s last collection at %ld, " + "update every %ld, %s page from %ld to %ld, position %u (of %u), flags: %s", + uuid, + point_in_time_s, + msg, + (time_t)(handle->page_end_time_ut / USEC_PER_SEC), + (time_t)(handle->update_every_ut / USEC_PER_SEC), + handle->pgc_page ? "current" : "*LAST*", + (time_t)(handle->page_start_time_ut / USEC_PER_SEC), + (time_t)(handle->page_end_time_ut / USEC_PER_SEC), + handle->page_position, handle->page_entries_max, + wb ? buffer_tostring(wb) : "" + ); + + buffer_free(wb); +#else + ; +#endif +} + +void rrdeng_store_metric_next(STORAGE_COLLECT_HANDLE *collection_handle, + const usec_t point_in_time_ut, + const NETDATA_DOUBLE n, + const NETDATA_DOUBLE min_value, + const NETDATA_DOUBLE max_value, + const uint16_t count, + const uint16_t anomaly_count, + const SN_FLAGS flags) +{ + timing_step(TIMING_STEP_RRDSET_STORE_METRIC); + + struct rrdeng_collect_handle *handle = (struct rrdeng_collect_handle *)collection_handle; + +#ifdef NETDATA_INTERNAL_CHECKS + if(unlikely(point_in_time_ut > (usec_t)max_acceptable_collected_time() * USEC_PER_SEC)) + handle->page_flags |= RRDENG_PAGE_FUTURE_POINT; +#endif + + usec_t delta_ut = point_in_time_ut - handle->page_end_time_ut; + + if(likely(delta_ut == handle->update_every_ut)) { + // happy path + ; + } + else if(unlikely(point_in_time_ut > handle->page_end_time_ut)) { + if(handle->pgc_page) { + if (unlikely(delta_ut < handle->update_every_ut)) { + handle->page_flags |= RRDENG_PAGE_STEP_TOO_SMALL; + rrdeng_store_metric_flush_current_page(collection_handle); + } + else if (unlikely(delta_ut % handle->update_every_ut)) { + handle->page_flags |= RRDENG_PAGE_STEP_UNALIGNED; + rrdeng_store_metric_flush_current_page(collection_handle); + } + else { + size_t points_gap = delta_ut / handle->update_every_ut; + size_t page_remaining_points = handle->page_entries_max - handle->page_position; + + if (points_gap >= page_remaining_points) { + handle->page_flags |= RRDENG_PAGE_BIG_GAP; + rrdeng_store_metric_flush_current_page(collection_handle); + } + else { + // loop to fill the gap + handle->page_flags |= RRDENG_PAGE_GAP; + + usec_t stop_ut = point_in_time_ut - handle->update_every_ut; + for (usec_t this_ut = handle->page_end_time_ut + handle->update_every_ut; + this_ut <= stop_ut; + this_ut = handle->page_end_time_ut + handle->update_every_ut) { + rrdeng_store_metric_append_point( + collection_handle, + this_ut, + NAN, NAN, NAN, + 1, 0, + SN_EMPTY_SLOT); + } + } + } + } + } + else if(unlikely(point_in_time_ut < handle->page_end_time_ut)) { + handle->page_flags |= RRDENG_PAGE_PAST_COLLECTION; + store_metric_next_error_log(handle, point_in_time_ut, "is older than the"); + return; + } + + else /* if(unlikely(point_in_time_ut == handle->page_end_time_ut)) */ { + handle->page_flags |= RRDENG_PAGE_REPEATED_COLLECTION; + store_metric_next_error_log(handle, point_in_time_ut, "is at the same time as the"); + return; + } + + timing_step(TIMING_STEP_DBENGINE_FIRST_CHECK); + + rrdeng_store_metric_append_point(collection_handle, + point_in_time_ut, + n, min_value, max_value, + count, anomaly_count, + flags); +} + +/* + * Releases the database reference from the handle for storing metrics. + * Returns 1 if it's safe to delete the dimension. + */ +int rrdeng_store_metric_finalize(STORAGE_COLLECT_HANDLE *collection_handle) { + struct rrdeng_collect_handle *handle = (struct rrdeng_collect_handle *)collection_handle; + struct rrdengine_instance *ctx = mrg_metric_ctx(handle->metric); + + handle->page_flags |= RRDENG_PAGE_COLLECT_FINALIZE; + rrdeng_store_metric_flush_current_page(collection_handle); + rrdeng_page_alignment_release(handle->alignment); + + __atomic_sub_fetch(&ctx->atomic.collectors_running, 1, __ATOMIC_RELAXED); + if(!(handle->options & RRDENG_1ST_METRIC_WRITER)) + __atomic_sub_fetch(&ctx->atomic.collectors_running_duplicate, 1, __ATOMIC_RELAXED); + + if((handle->options & RRDENG_1ST_METRIC_WRITER) && !mrg_metric_clear_writer(main_mrg, handle->metric)) + internal_fatal(true, "DBENGINE: metric is already released"); + + time_t first_time_s, last_time_s, update_every_s; + mrg_metric_get_retention(main_mrg, handle->metric, &first_time_s, &last_time_s, &update_every_s); + + mrg_metric_release(main_mrg, handle->metric); + freez(handle); + + if(!first_time_s && !last_time_s) + return 1; + + return 0; +} + +void rrdeng_store_metric_change_collection_frequency(STORAGE_COLLECT_HANDLE *collection_handle, int update_every) { + struct rrdeng_collect_handle *handle = (struct rrdeng_collect_handle *)collection_handle; + check_and_fix_mrg_update_every(handle); + + METRIC *metric = handle->metric; + usec_t update_every_ut = (usec_t)update_every * USEC_PER_SEC; + + if(update_every_ut == handle->update_every_ut) + return; + + handle->page_flags |= RRDENG_PAGE_UPDATE_EVERY_CHANGE; + rrdeng_store_metric_flush_current_page(collection_handle); + mrg_metric_set_update_every(main_mrg, metric, update_every); + handle->update_every_ut = update_every_ut; +} + +// ---------------------------------------------------------------------------- +// query ops + +#ifdef NETDATA_INTERNAL_CHECKS +SPINLOCK global_query_handle_spinlock = NETDATA_SPINLOCK_INITIALIZER; +static struct rrdeng_query_handle *global_query_handle_ll = NULL; +static void register_query_handle(struct rrdeng_query_handle *handle) { + handle->query_pid = gettid(); + handle->started_time_s = now_realtime_sec(); + + spinlock_lock(&global_query_handle_spinlock); + DOUBLE_LINKED_LIST_APPEND_ITEM_UNSAFE(global_query_handle_ll, handle, prev, next); + spinlock_unlock(&global_query_handle_spinlock); +} +static void unregister_query_handle(struct rrdeng_query_handle *handle) { + spinlock_lock(&global_query_handle_spinlock); + DOUBLE_LINKED_LIST_REMOVE_ITEM_UNSAFE(global_query_handle_ll, handle, prev, next); + spinlock_unlock(&global_query_handle_spinlock); +} +#else +static void register_query_handle(struct rrdeng_query_handle *handle __maybe_unused) { + ; +} +static void unregister_query_handle(struct rrdeng_query_handle *handle __maybe_unused) { + ; +} +#endif + +/* + * Gets a handle for loading metrics from the database. + * The handle must be released with rrdeng_load_metric_final(). + */ +void rrdeng_load_metric_init(STORAGE_METRIC_HANDLE *db_metric_handle, + struct storage_engine_query_handle *rrddim_handle, + time_t start_time_s, + time_t end_time_s, + STORAGE_PRIORITY priority) +{ + usec_t started_ut = now_monotonic_usec(); + + netdata_thread_disable_cancelability(); + + METRIC *metric = (METRIC *)db_metric_handle; + struct rrdengine_instance *ctx = mrg_metric_ctx(metric); + struct rrdeng_query_handle *handle; + + handle = rrdeng_query_handle_get(); + register_query_handle(handle); + + if (unlikely(priority < STORAGE_PRIORITY_HIGH)) + priority = STORAGE_PRIORITY_HIGH; + else if (unlikely(priority >= STORAGE_PRIORITY_INTERNAL_MAX_DONT_USE)) + priority = STORAGE_PRIORITY_INTERNAL_MAX_DONT_USE - 1; + + handle->ctx = ctx; + handle->metric = metric; + handle->priority = priority; + + // IMPORTANT! + // It is crucial not to exceed the db boundaries, because dbengine + // now has gap caching, so when a gap is detected a negative page + // is inserted into the main cache, to avoid scanning the journals + // again for pages matching the gap. + + time_t db_first_time_s, db_last_time_s, db_update_every_s; + mrg_metric_get_retention(main_mrg, metric, &db_first_time_s, &db_last_time_s, &db_update_every_s); + + if(is_page_in_time_range(start_time_s, end_time_s, db_first_time_s, db_last_time_s) == PAGE_IS_IN_RANGE) { + handle->start_time_s = MAX(start_time_s, db_first_time_s); + handle->end_time_s = MIN(end_time_s, db_last_time_s); + handle->now_s = handle->start_time_s; + + handle->dt_s = db_update_every_s; + if (!handle->dt_s) { + handle->dt_s = default_rrd_update_every; + mrg_metric_set_update_every_s_if_zero(main_mrg, metric, default_rrd_update_every); + } + + rrddim_handle->handle = (STORAGE_QUERY_HANDLE *) handle; + rrddim_handle->start_time_s = handle->start_time_s; + rrddim_handle->end_time_s = handle->end_time_s; + rrddim_handle->priority = priority; + rrddim_handle->backend = STORAGE_ENGINE_BACKEND_DBENGINE; + + pg_cache_preload(handle); + + __atomic_add_fetch(&rrdeng_cache_efficiency_stats.query_time_init, now_monotonic_usec() - started_ut, __ATOMIC_RELAXED); + } + else { + handle->start_time_s = start_time_s; + handle->end_time_s = end_time_s; + handle->now_s = start_time_s; + handle->dt_s = db_update_every_s; + + rrddim_handle->handle = (STORAGE_QUERY_HANDLE *) handle; + rrddim_handle->start_time_s = handle->start_time_s; + rrddim_handle->end_time_s = 0; + rrddim_handle->priority = priority; + rrddim_handle->backend = STORAGE_ENGINE_BACKEND_DBENGINE; + } +} + +static bool rrdeng_load_page_next(struct storage_engine_query_handle *rrddim_handle, bool debug_this __maybe_unused) { + struct rrdeng_query_handle *handle = (struct rrdeng_query_handle *)rrddim_handle->handle; + struct rrdengine_instance *ctx = mrg_metric_ctx(handle->metric); + + if (likely(handle->page)) { + // we have a page to release + pgc_page_release(main_cache, handle->page); + handle->page = NULL; + pgdc_reset(&handle->pgdc, NULL, UINT32_MAX); + } + + if (unlikely(handle->now_s > rrddim_handle->end_time_s)) + return false; + + size_t entries = 0; + handle->page = pg_cache_lookup_next(ctx, handle->pdc, handle->now_s, handle->dt_s, &entries); + + internal_fatal(handle->page && (pgc_page_data(handle->page) == PGD_EMPTY || !entries), + "A page was returned, but it is empty - pg_cache_lookup_next() should be handling this case"); + + if (unlikely(!handle->page || pgc_page_data(handle->page) == PGD_EMPTY || !entries)) + return false; + + time_t page_start_time_s = pgc_page_start_time_s(handle->page); + time_t page_end_time_s = pgc_page_end_time_s(handle->page); + time_t page_update_every_s = pgc_page_update_every_s(handle->page); + + unsigned position; + if(likely(handle->now_s >= page_start_time_s && handle->now_s <= page_end_time_s)) { + + if(unlikely(entries == 1 || page_start_time_s == page_end_time_s || !page_update_every_s)) { + position = 0; + handle->now_s = page_start_time_s; + } + else { + position = (handle->now_s - page_start_time_s) * (entries - 1) / (page_end_time_s - page_start_time_s); + time_t point_end_time_s = page_start_time_s + position * page_update_every_s; + while(point_end_time_s < handle->now_s && position + 1 < entries) { + // https://github.com/netdata/netdata/issues/14411 + // we really need a while() here, because the delta may be + // 2 points at higher tiers + position++; + point_end_time_s = page_start_time_s + position * page_update_every_s; + } + handle->now_s = point_end_time_s; + } + + internal_fatal(position >= entries, "DBENGINE: wrong page position calculation"); + } + else if(handle->now_s < page_start_time_s) { + handle->now_s = page_start_time_s; + position = 0; + } + else { + internal_fatal(true, "DBENGINE: this page is entirely in our past and should not be accepted for this query in the first place"); + handle->now_s = page_end_time_s; + position = entries - 1; + } + + handle->entries = entries; + handle->position = position; + handle->dt_s = page_update_every_s; + + pgdc_reset(&handle->pgdc, pgc_page_data(handle->page), handle->position); + + return true; +} + +// Returns the metric and sets its timestamp into current_time +// IT IS REQUIRED TO **ALWAYS** SET ALL RETURN VALUES (current_time, end_time, flags) +// IT IS REQUIRED TO **ALWAYS** KEEP TRACK OF TIME, EVEN OUTSIDE THE DATABASE BOUNDARIES +STORAGE_POINT rrdeng_load_metric_next(struct storage_engine_query_handle *rrddim_handle) { + struct rrdeng_query_handle *handle = (struct rrdeng_query_handle *)rrddim_handle->handle; + STORAGE_POINT sp; + + if (unlikely(handle->now_s > rrddim_handle->end_time_s)) { + storage_point_empty(sp, handle->now_s - handle->dt_s, handle->now_s); + goto prepare_for_next_iteration; + } + + if (unlikely(!handle->page || handle->position >= handle->entries)) { + // We need to get a new page + + if (!rrdeng_load_page_next(rrddim_handle, false)) { + handle->now_s = rrddim_handle->end_time_s; + storage_point_empty(sp, handle->now_s - handle->dt_s, handle->now_s); + goto prepare_for_next_iteration; + } + } + + sp.start_time_s = handle->now_s - handle->dt_s; + sp.end_time_s = handle->now_s; + + pgdc_get_next_point(&handle->pgdc, handle->position, &sp); + +prepare_for_next_iteration: + internal_fatal(sp.end_time_s < rrddim_handle->start_time_s, "DBENGINE: this point is too old for this query"); + internal_fatal(sp.end_time_s < handle->now_s, "DBENGINE: this point is too old for this point in time"); + + handle->now_s += handle->dt_s; + handle->position++; + + return sp; +} + +int rrdeng_load_metric_is_finished(struct storage_engine_query_handle *rrddim_handle) { + struct rrdeng_query_handle *handle = (struct rrdeng_query_handle *)rrddim_handle->handle; + return (handle->now_s > rrddim_handle->end_time_s); +} + +/* + * Releases the database reference from the handle for loading metrics. + */ +void rrdeng_load_metric_finalize(struct storage_engine_query_handle *rrddim_handle) +{ + struct rrdeng_query_handle *handle = (struct rrdeng_query_handle *)rrddim_handle->handle; + + if (handle->page) { + pgc_page_release(main_cache, handle->page); + pgdc_reset(&handle->pgdc, NULL, UINT32_MAX); + } + + if(!pdc_release_and_destroy_if_unreferenced(handle->pdc, false, false)) + __atomic_store_n(&handle->pdc->workers_should_stop, true, __ATOMIC_RELAXED); + + unregister_query_handle(handle); + rrdeng_query_handle_release(handle); + rrddim_handle->handle = NULL; + netdata_thread_enable_cancelability(); +} + +time_t rrdeng_load_align_to_optimal_before(struct storage_engine_query_handle *rrddim_handle) { + struct rrdeng_query_handle *handle = (struct rrdeng_query_handle *)rrddim_handle->handle; + + if(handle->pdc) { + rrdeng_prep_wait(handle->pdc); + if (handle->pdc->optimal_end_time_s > rrddim_handle->end_time_s) + rrddim_handle->end_time_s = handle->pdc->optimal_end_time_s; + } + + return rrddim_handle->end_time_s; +} + +time_t rrdeng_metric_latest_time(STORAGE_METRIC_HANDLE *db_metric_handle) { + METRIC *metric = (METRIC *)db_metric_handle; + time_t latest_time_s = 0; + + if (metric) + latest_time_s = mrg_metric_get_latest_time_s(main_mrg, metric); + + return latest_time_s; +} + +time_t rrdeng_metric_oldest_time(STORAGE_METRIC_HANDLE *db_metric_handle) { + METRIC *metric = (METRIC *)db_metric_handle; + + time_t oldest_time_s = 0; + if (metric) + oldest_time_s = mrg_metric_get_first_time_s(main_mrg, metric); + + return oldest_time_s; +} + +bool rrdeng_metric_retention_by_uuid(STORAGE_INSTANCE *db_instance, uuid_t *dim_uuid, time_t *first_entry_s, time_t *last_entry_s) +{ + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + if (unlikely(!ctx)) { + netdata_log_error("DBENGINE: invalid STORAGE INSTANCE to %s()", __FUNCTION__); + return false; + } + + METRIC *metric = mrg_metric_get_and_acquire(main_mrg, dim_uuid, (Word_t) ctx); + if (unlikely(!metric)) + return false; + + time_t update_every_s; + mrg_metric_get_retention(main_mrg, metric, first_entry_s, last_entry_s, &update_every_s); + + mrg_metric_release(main_mrg, metric); + + return true; +} + +uint64_t rrdeng_disk_space_max(STORAGE_INSTANCE *db_instance) { + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + return ctx->config.max_disk_space; +} + +uint64_t rrdeng_disk_space_used(STORAGE_INSTANCE *db_instance) { + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + return __atomic_load_n(&ctx->atomic.current_disk_space, __ATOMIC_RELAXED); +} + +time_t rrdeng_global_first_time_s(STORAGE_INSTANCE *db_instance) { + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + + time_t t = __atomic_load_n(&ctx->atomic.first_time_s, __ATOMIC_RELAXED); + if(t == LONG_MAX || t < 0) + t = 0; + + return t; +} + +size_t rrdeng_currently_collected_metrics(STORAGE_INSTANCE *db_instance) { + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + return __atomic_load_n(&ctx->atomic.collectors_running, __ATOMIC_RELAXED); +} + +/* + * 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) +{ + if (ctx == NULL) + return; + + array[0] = (uint64_t)__atomic_load_n(&ctx->atomic.collectors_running, __ATOMIC_RELAXED); // API producers + array[1] = (uint64_t)__atomic_load_n(&ctx->atomic.inflight_queries, __ATOMIC_RELAXED); // API consumers + array[2] = 0; + array[3] = 0; + array[4] = 0; + array[5] = 0; // (uint64_t)ctx->stats.pg_cache_insertions; + array[6] = 0; // (uint64_t)ctx->stats.pg_cache_deletions; + array[7] = 0; // (uint64_t)ctx->stats.pg_cache_hits; + array[8] = 0; // (uint64_t)ctx->stats.pg_cache_misses; + array[9] = 0; // (uint64_t)ctx->stats.pg_cache_backfills; + array[10] = 0; // (uint64_t)ctx->stats.pg_cache_evictions; + array[11] = (uint64_t)__atomic_load_n(&ctx->stats.before_compress_bytes, __ATOMIC_RELAXED); // used + array[12] = (uint64_t)__atomic_load_n(&ctx->stats.after_compress_bytes, __ATOMIC_RELAXED); // used + array[13] = (uint64_t)__atomic_load_n(&ctx->stats.before_decompress_bytes, __ATOMIC_RELAXED); + array[14] = (uint64_t)__atomic_load_n(&ctx->stats.after_decompress_bytes, __ATOMIC_RELAXED); + array[15] = (uint64_t)__atomic_load_n(&ctx->stats.io_write_bytes, __ATOMIC_RELAXED); // used + array[16] = (uint64_t)__atomic_load_n(&ctx->stats.io_write_requests, __ATOMIC_RELAXED); // used + array[17] = (uint64_t)__atomic_load_n(&ctx->stats.io_read_bytes, __ATOMIC_RELAXED); + array[18] = (uint64_t)__atomic_load_n(&ctx->stats.io_read_requests, __ATOMIC_RELAXED); // used + array[19] = 0; // (uint64_t)__atomic_load_n(&ctx->stats.io_write_extent_bytes, __ATOMIC_RELAXED); + array[20] = 0; // (uint64_t)__atomic_load_n(&ctx->stats.io_write_extents, __ATOMIC_RELAXED); + array[21] = 0; // (uint64_t)__atomic_load_n(&ctx->stats.io_read_extent_bytes, __ATOMIC_RELAXED); + array[22] = 0; // (uint64_t)__atomic_load_n(&ctx->stats.io_read_extents, __ATOMIC_RELAXED); + array[23] = (uint64_t)__atomic_load_n(&ctx->stats.datafile_creations, __ATOMIC_RELAXED); + array[24] = (uint64_t)__atomic_load_n(&ctx->stats.datafile_deletions, __ATOMIC_RELAXED); + array[25] = (uint64_t)__atomic_load_n(&ctx->stats.journalfile_creations, __ATOMIC_RELAXED); + array[26] = (uint64_t)__atomic_load_n(&ctx->stats.journalfile_deletions, __ATOMIC_RELAXED); + array[27] = 0; // (uint64_t)__atomic_load_n(&ctx->stats.page_cache_descriptors, __ATOMIC_RELAXED); + array[28] = (uint64_t)__atomic_load_n(&ctx->stats.io_errors, __ATOMIC_RELAXED); + array[29] = (uint64_t)__atomic_load_n(&ctx->stats.fs_errors, __ATOMIC_RELAXED); + array[30] = (uint64_t)__atomic_load_n(&global_io_errors, __ATOMIC_RELAXED); // used + array[31] = (uint64_t)__atomic_load_n(&global_fs_errors, __ATOMIC_RELAXED); // used + array[32] = (uint64_t)__atomic_load_n(&rrdeng_reserved_file_descriptors, __ATOMIC_RELAXED); // used + array[33] = 0; // (uint64_t)__atomic_load_n(&ctx->stats.pg_cache_over_half_dirty_events, __ATOMIC_RELAXED); + array[34] = (uint64_t)__atomic_load_n(&global_pg_cache_over_half_dirty_events, __ATOMIC_RELAXED); // used + array[35] = 0; // (uint64_t)__atomic_load_n(&ctx->stats.flushing_pressure_page_deletions, __ATOMIC_RELAXED); + array[36] = (uint64_t)__atomic_load_n(&global_flushing_pressure_page_deletions, __ATOMIC_RELAXED); // used + array[37] = 0; //(uint64_t)pg_cache->active_descriptors; + + fatal_assert(RRDENG_NR_STATS == 38); +} + +static void rrdeng_populate_mrg(struct rrdengine_instance *ctx) { + uv_rwlock_rdlock(&ctx->datafiles.rwlock); + size_t datafiles = 0; + for(struct rrdengine_datafile *df = ctx->datafiles.first; df ;df = df->next) + datafiles++; + uv_rwlock_rdunlock(&ctx->datafiles.rwlock); + + ssize_t cpus = (ssize_t)get_netdata_cpus() / (ssize_t)storage_tiers; + if(cpus > (ssize_t)datafiles) + cpus = (ssize_t)datafiles; + + if(cpus > (ssize_t)libuv_worker_threads) + cpus = (ssize_t)libuv_worker_threads; + + if(cpus >= (ssize_t)get_netdata_cpus() / 2) + cpus = (ssize_t)(get_netdata_cpus() / 2 - 1); + + if(cpus < 1) + cpus = 1; + + netdata_log_info("DBENGINE: populating retention to MRG from %zu journal files of tier %d, using %zd threads...", datafiles, ctx->config.tier, cpus); + + if(datafiles > 2) { + struct rrdengine_datafile *datafile; + + datafile = ctx->datafiles.first->prev; + if(!(datafile->journalfile->v2.flags & JOURNALFILE_FLAG_IS_AVAILABLE)) + datafile = datafile->prev; + + if(datafile->journalfile->v2.flags & JOURNALFILE_FLAG_IS_AVAILABLE) { + journalfile_v2_populate_retention_to_mrg(ctx, datafile->journalfile); + datafile->populate_mrg.populated = true; + } + + datafile = ctx->datafiles.first; + if(datafile->journalfile->v2.flags & JOURNALFILE_FLAG_IS_AVAILABLE) { + journalfile_v2_populate_retention_to_mrg(ctx, datafile->journalfile); + datafile->populate_mrg.populated = true; + } + } + + ctx->loading.populate_mrg.size = cpus; + ctx->loading.populate_mrg.array = callocz(ctx->loading.populate_mrg.size, sizeof(struct completion)); + + for (size_t i = 0; i < ctx->loading.populate_mrg.size; i++) { + completion_init(&ctx->loading.populate_mrg.array[i]); + rrdeng_enq_cmd(ctx, RRDENG_OPCODE_CTX_POPULATE_MRG, NULL, &ctx->loading.populate_mrg.array[i], + STORAGE_PRIORITY_INTERNAL_DBENGINE, NULL, NULL); + } +} + +void rrdeng_readiness_wait(struct rrdengine_instance *ctx) { + for (size_t i = 0; i < ctx->loading.populate_mrg.size; i++) { + completion_wait_for(&ctx->loading.populate_mrg.array[i]); + completion_destroy(&ctx->loading.populate_mrg.array[i]); + } + + freez(ctx->loading.populate_mrg.array); + ctx->loading.populate_mrg.array = NULL; + ctx->loading.populate_mrg.size = 0; + + netdata_log_info("DBENGINE: tier %d is ready for data collection and queries", ctx->config.tier); +} + +bool rrdeng_is_legacy(STORAGE_INSTANCE *db_instance) { + struct rrdengine_instance *ctx = (struct rrdengine_instance *)db_instance; + return ctx->config.legacy; +} + +void rrdeng_exit_mode(struct rrdengine_instance *ctx) { + __atomic_store_n(&ctx->quiesce.exit_mode, true, __ATOMIC_RELAXED); +} +/* + * Returns 0 on success, negative on error + */ +int rrdeng_init(struct rrdengine_instance **ctxp, const char *dbfiles_path, + unsigned disk_space_mb, size_t tier) { + struct rrdengine_instance *ctx; + 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) { + netdata_log_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) { + ctx = multidb_ctx[tier]; + memset(ctx, 0, sizeof(*ctx)); + ctx->config.legacy = false; + } + else { + *ctxp = ctx = callocz(1, sizeof(*ctx)); + ctx->config.legacy = true; + } + + ctx->config.tier = (int)tier; + ctx->config.page_type = tier_page_type[tier]; + ctx->config.global_compress_alg = RRD_LZ4; + if (disk_space_mb < RRDENG_MIN_DISK_SPACE_MB) + disk_space_mb = RRDENG_MIN_DISK_SPACE_MB; + ctx->config.max_disk_space = disk_space_mb * 1048576LLU; + strncpyz(ctx->config.dbfiles_path, dbfiles_path, sizeof(ctx->config.dbfiles_path) - 1); + ctx->config.dbfiles_path[sizeof(ctx->config.dbfiles_path) - 1] = '\0'; + + ctx->atomic.transaction_id = 1; + ctx->quiesce.enabled = false; + + rw_spinlock_init(&ctx->njfv2idx.spinlock); + ctx->atomic.first_time_s = LONG_MAX; + + if (rrdeng_dbengine_spawn(ctx) && !init_rrd_files(ctx)) { + // success - we run this ctx too + rrdeng_populate_mrg(ctx); + return 0; + } + + if (ctx->config.legacy) { + freez(ctx); + if (ctxp) + *ctxp = NULL; + } + + rrd_stat_atomic_add(&rrdeng_reserved_file_descriptors, -RRDENG_FD_BUDGET_PER_INSTANCE); + return UV_EIO; +} + +size_t rrdeng_collectors_running(struct rrdengine_instance *ctx) { + return __atomic_load_n(&ctx->atomic.collectors_running, __ATOMIC_RELAXED); +} + +/* + * Returns 0 on success, 1 on error + */ +int rrdeng_exit(struct rrdengine_instance *ctx) { + if (NULL == ctx) + return 1; + + // FIXME - ktsaou - properly cleanup ctx + // 1. make sure all collectors are stopped + // 2. make new queries will not be accepted (this is quiesce that has already run) + // 3. flush this section of the main cache + // 4. then wait for completion + + bool logged = false; + size_t count = 10; + while(__atomic_load_n(&ctx->atomic.collectors_running, __ATOMIC_RELAXED) && count && !unittest_running) { + if(!logged) { + netdata_log_info("DBENGINE: waiting for collectors to finish on tier %d...", (ctx->config.legacy) ? -1 : ctx->config.tier); + logged = true; + } + sleep_usec(100 * USEC_PER_MS); + count--; + } + + netdata_log_info("DBENGINE: flushing main cache for tier %d", (ctx->config.legacy) ? -1 : ctx->config.tier); + pgc_flush_all_hot_and_dirty_pages(main_cache, (Word_t)ctx); + + netdata_log_info("DBENGINE: shutting down tier %d", (ctx->config.legacy) ? -1 : ctx->config.tier); + struct completion completion = {}; + completion_init(&completion); + rrdeng_enq_cmd(ctx, RRDENG_OPCODE_CTX_SHUTDOWN, NULL, &completion, STORAGE_PRIORITY_BEST_EFFORT, NULL, NULL); + completion_wait_for(&completion); + completion_destroy(&completion); + + finalize_rrd_files(ctx); + + if(ctx->config.legacy) + freez(ctx); + + rrd_stat_atomic_add(&rrdeng_reserved_file_descriptors, -RRDENG_FD_BUDGET_PER_INSTANCE); + return 0; +} + +void rrdeng_prepare_exit(struct rrdengine_instance *ctx) { + if (NULL == ctx) + return; + + // FIXME - ktsaou - properly cleanup ctx + // 1. make sure all collectors are stopped + + completion_init(&ctx->quiesce.completion); + rrdeng_enq_cmd(ctx, RRDENG_OPCODE_CTX_QUIESCE, NULL, NULL, STORAGE_PRIORITY_INTERNAL_DBENGINE, NULL, NULL); +} + +static void populate_v2_statistics(struct rrdengine_datafile *datafile, RRDENG_SIZE_STATS *stats) +{ + struct journal_v2_header *j2_header = journalfile_v2_data_acquire(datafile->journalfile, NULL, 0, 0); + void *data_start = (void *)j2_header; + + if(unlikely(!j2_header)) + return; + + stats->extents += j2_header->extent_count; + + unsigned entries; + struct journal_extent_list *extent_list = (void *) (data_start + j2_header->extent_offset); + for (entries = 0; entries < j2_header->extent_count; entries++) { + stats->extents_compressed_bytes += extent_list->datafile_size; + stats->extents_pages += extent_list->pages; + extent_list++; + } + + struct journal_metric_list *metric = (void *) (data_start + j2_header->metric_offset); + time_t journal_start_time_s = (time_t) (j2_header->start_time_ut / USEC_PER_SEC); + + stats->metrics += j2_header->metric_count; + for (entries = 0; entries < j2_header->metric_count; entries++) { + + struct journal_page_header *metric_list_header = (void *) (data_start + metric->page_offset); + stats->metrics_pages += metric_list_header->entries; + struct journal_page_list *descr = (void *) (data_start + metric->page_offset + sizeof(struct journal_page_header)); + for (uint32_t idx=0; idx < metric_list_header->entries; idx++) { + + time_t update_every_s; + + size_t points = descr->page_length / CTX_POINT_SIZE_BYTES(datafile->ctx); + + time_t start_time_s = journal_start_time_s + descr->delta_start_s; + time_t end_time_s = journal_start_time_s + descr->delta_end_s; + + if(likely(points > 1)) + update_every_s = (time_t) ((end_time_s - start_time_s) / (points - 1)); + else { + update_every_s = (time_t) (default_rrd_update_every * get_tier_grouping(datafile->ctx->config.tier)); + stats->single_point_pages++; + } + + time_t duration_s = (time_t)((end_time_s - start_time_s + update_every_s)); + + stats->pages_uncompressed_bytes += descr->page_length; + stats->pages_duration_secs += duration_s; + stats->points += points; + + stats->page_types[descr->type].pages++; + stats->page_types[descr->type].pages_uncompressed_bytes += descr->page_length; + stats->page_types[descr->type].pages_duration_secs += duration_s; + stats->page_types[descr->type].points += points; + + if(!stats->first_time_s || (start_time_s - update_every_s) < stats->first_time_s) + stats->first_time_s = (start_time_s - update_every_s); + + if(!stats->last_time_s || end_time_s > stats->last_time_s) + stats->last_time_s = end_time_s; + + descr++; + } + metric++; + } + + journalfile_v2_data_release(datafile->journalfile); +} + +RRDENG_SIZE_STATS rrdeng_size_statistics(struct rrdengine_instance *ctx) { + RRDENG_SIZE_STATS stats = { 0 }; + + uv_rwlock_rdlock(&ctx->datafiles.rwlock); + for(struct rrdengine_datafile *df = ctx->datafiles.first; df ;df = df->next) { + stats.datafiles++; + populate_v2_statistics(df, &stats); + } + uv_rwlock_rdunlock(&ctx->datafiles.rwlock); + + stats.currently_collected_metrics = __atomic_load_n(&ctx->atomic.collectors_running, __ATOMIC_RELAXED); + + internal_error(stats.metrics_pages != stats.extents_pages + stats.currently_collected_metrics, + "DBENGINE: metrics pages is %zu, but extents pages is %zu and API consumers is %zu", + stats.metrics_pages, stats.extents_pages, stats.currently_collected_metrics); + + stats.disk_space = ctx_current_disk_space_get(ctx); + stats.max_disk_space = ctx->config.max_disk_space; + + stats.database_retention_secs = (time_t)(stats.last_time_s - stats.first_time_s); + + if(stats.extents_pages) + stats.average_page_size_bytes = (double)stats.pages_uncompressed_bytes / (double)stats.extents_pages; + + if(stats.pages_uncompressed_bytes > 0) + stats.average_compression_savings = 100.0 - ((double)stats.extents_compressed_bytes * 100.0 / (double)stats.pages_uncompressed_bytes); + + if(stats.points) + stats.average_point_duration_secs = (double)stats.pages_duration_secs / (double)stats.points; + + if(stats.metrics) { + stats.average_metric_retention_secs = (double)stats.pages_duration_secs / (double)stats.metrics; + + if(stats.database_retention_secs) { + double metric_coverage = stats.average_metric_retention_secs / (double)stats.database_retention_secs; + double db_retention_days = (double)stats.database_retention_secs / 86400.0; + + stats.estimated_concurrently_collected_metrics = stats.metrics * metric_coverage; + + stats.ephemeral_metrics_per_day_percent = ((double)stats.metrics * 100.0 / (double)stats.estimated_concurrently_collected_metrics - 100.0) / (double)db_retention_days; + } + } + +// stats.sizeof_metric = 0; + stats.sizeof_datafile = struct_natural_alignment(sizeof(struct rrdengine_datafile)) + struct_natural_alignment(sizeof(struct rrdengine_journalfile)); + stats.sizeof_page_in_cache = 0; // struct_natural_alignment(sizeof(struct page_cache_descr)); + stats.sizeof_point_data = page_type_size[ctx->config.page_type]; + stats.sizeof_page_data = tier_page_size[ctx->config.tier]; + stats.pages_per_extent = rrdeng_pages_per_extent; + +// stats.sizeof_metric_in_index = 40; +// stats.sizeof_page_in_index = 24; + + stats.default_granularity_secs = (size_t)default_rrd_update_every * get_tier_grouping(ctx->config.tier); + + return stats; +} + +struct rrdeng_cache_efficiency_stats rrdeng_get_cache_efficiency_stats(void) { + // FIXME - make cache efficiency stats atomic + return rrdeng_cache_efficiency_stats; +} |