diff options
Diffstat (limited to '')
| -rw-r--r-- | database/engine/rrdengine.c | 1266 |
1 files changed, 1266 insertions, 0 deletions
diff --git a/database/engine/rrdengine.c b/database/engine/rrdengine.c new file mode 100644 index 0000000..43135ff --- /dev/null +++ b/database/engine/rrdengine.c @@ -0,0 +1,1266 @@ +// SPDX-License-Identifier: GPL-3.0-or-later +#define NETDATA_RRD_INTERNALS + +#include "rrdengine.h" + +rrdeng_stats_t global_io_errors = 0; +rrdeng_stats_t global_fs_errors = 0; +rrdeng_stats_t rrdeng_reserved_file_descriptors = 0; +rrdeng_stats_t global_pg_cache_over_half_dirty_events = 0; +rrdeng_stats_t global_flushing_pressure_page_deletions = 0; + +static void sanity_check(void) +{ + /* Magic numbers must fit in the super-blocks */ + BUILD_BUG_ON(strlen(RRDENG_DF_MAGIC) > RRDENG_MAGIC_SZ); + BUILD_BUG_ON(strlen(RRDENG_JF_MAGIC) > RRDENG_MAGIC_SZ); + + /* Version strings must fit in the super-blocks */ + BUILD_BUG_ON(strlen(RRDENG_DF_VER) > RRDENG_VER_SZ); + BUILD_BUG_ON(strlen(RRDENG_JF_VER) > RRDENG_VER_SZ); + + /* Data file super-block cannot be larger than RRDENG_BLOCK_SIZE */ + BUILD_BUG_ON(RRDENG_DF_SB_PADDING_SZ < 0); + + BUILD_BUG_ON(sizeof(uuid_t) != UUID_SZ); /* check UUID size */ + + /* page count must fit in 8 bits */ + BUILD_BUG_ON(MAX_PAGES_PER_EXTENT > 255); + + /* extent cache count must fit in 32 bits */ + BUILD_BUG_ON(MAX_CACHED_EXTENTS > 32); + + /* page info scratch space must be able to hold 2 32-bit integers */ + BUILD_BUG_ON(sizeof(((struct rrdeng_page_info *)0)->scratch) < 2 * sizeof(uint32_t)); +} + +/* always inserts into tail */ +static inline void xt_cache_replaceQ_insert(struct rrdengine_worker_config* wc, + struct extent_cache_element *xt_cache_elem) +{ + struct extent_cache *xt_cache = &wc->xt_cache; + + xt_cache_elem->prev = NULL; + xt_cache_elem->next = NULL; + + if (likely(NULL != xt_cache->replaceQ_tail)) { + xt_cache_elem->prev = xt_cache->replaceQ_tail; + xt_cache->replaceQ_tail->next = xt_cache_elem; + } + if (unlikely(NULL == xt_cache->replaceQ_head)) { + xt_cache->replaceQ_head = xt_cache_elem; + } + xt_cache->replaceQ_tail = xt_cache_elem; +} + +static inline void xt_cache_replaceQ_delete(struct rrdengine_worker_config* wc, + struct extent_cache_element *xt_cache_elem) +{ + struct extent_cache *xt_cache = &wc->xt_cache; + struct extent_cache_element *prev, *next; + + prev = xt_cache_elem->prev; + next = xt_cache_elem->next; + + if (likely(NULL != prev)) { + prev->next = next; + } + if (likely(NULL != next)) { + next->prev = prev; + } + if (unlikely(xt_cache_elem == xt_cache->replaceQ_head)) { + xt_cache->replaceQ_head = next; + } + if (unlikely(xt_cache_elem == xt_cache->replaceQ_tail)) { + xt_cache->replaceQ_tail = prev; + } + xt_cache_elem->prev = xt_cache_elem->next = NULL; +} + +static inline void xt_cache_replaceQ_set_hot(struct rrdengine_worker_config* wc, + struct extent_cache_element *xt_cache_elem) +{ + xt_cache_replaceQ_delete(wc, xt_cache_elem); + xt_cache_replaceQ_insert(wc, xt_cache_elem); +} + +/* Returns the index of the cached extent if it was successfully inserted in the extent cache, otherwise -1 */ +static int try_insert_into_xt_cache(struct rrdengine_worker_config* wc, struct extent_info *extent) +{ + struct extent_cache *xt_cache = &wc->xt_cache; + struct extent_cache_element *xt_cache_elem; + unsigned idx; + int ret; + + ret = find_first_zero(xt_cache->allocation_bitmap); + if (-1 == ret || ret >= MAX_CACHED_EXTENTS) { + for (xt_cache_elem = xt_cache->replaceQ_head ; NULL != xt_cache_elem ; xt_cache_elem = xt_cache_elem->next) { + idx = xt_cache_elem - xt_cache->extent_array; + if (!check_bit(xt_cache->inflight_bitmap, idx)) { + xt_cache_replaceQ_delete(wc, xt_cache_elem); + break; + } + } + if (NULL == xt_cache_elem) + return -1; + } else { + idx = (unsigned)ret; + xt_cache_elem = &xt_cache->extent_array[idx]; + } + xt_cache_elem->extent = extent; + xt_cache_elem->fileno = extent->datafile->fileno; + xt_cache_elem->inflight_io_descr = NULL; + xt_cache_replaceQ_insert(wc, xt_cache_elem); + modify_bit(&xt_cache->allocation_bitmap, idx, 1); + + return (int)idx; +} + +/** + * Returns 0 if the cached extent was found in the extent cache, 1 otherwise. + * Sets *idx to point to the position of the extent inside the cache. + **/ +static uint8_t lookup_in_xt_cache(struct rrdengine_worker_config* wc, struct extent_info *extent, unsigned *idx) +{ + struct extent_cache *xt_cache = &wc->xt_cache; + struct extent_cache_element *xt_cache_elem; + unsigned i; + + for (i = 0 ; i < MAX_CACHED_EXTENTS ; ++i) { + xt_cache_elem = &xt_cache->extent_array[i]; + if (check_bit(xt_cache->allocation_bitmap, i) && xt_cache_elem->extent == extent && + xt_cache_elem->fileno == extent->datafile->fileno) { + *idx = i; + return 0; + } + } + return 1; +} + +#if 0 /* disabled code */ +static void delete_from_xt_cache(struct rrdengine_worker_config* wc, unsigned idx) +{ + struct extent_cache *xt_cache = &wc->xt_cache; + struct extent_cache_element *xt_cache_elem; + + xt_cache_elem = &xt_cache->extent_array[idx]; + xt_cache_replaceQ_delete(wc, xt_cache_elem); + xt_cache_elem->extent = NULL; + modify_bit(&wc->xt_cache.allocation_bitmap, idx, 0); /* invalidate it */ + modify_bit(&wc->xt_cache.inflight_bitmap, idx, 0); /* not in-flight anymore */ +} +#endif + +void enqueue_inflight_read_to_xt_cache(struct rrdengine_worker_config* wc, unsigned idx, + struct extent_io_descriptor *xt_io_descr) +{ + struct extent_cache *xt_cache = &wc->xt_cache; + struct extent_cache_element *xt_cache_elem; + struct extent_io_descriptor *old_next; + + xt_cache_elem = &xt_cache->extent_array[idx]; + old_next = xt_cache_elem->inflight_io_descr->next; + xt_cache_elem->inflight_io_descr->next = xt_io_descr; + xt_io_descr->next = old_next; +} + +void read_cached_extent_cb(struct rrdengine_worker_config* wc, unsigned idx, struct extent_io_descriptor *xt_io_descr) +{ + unsigned i, j, page_offset; + struct rrdengine_instance *ctx = wc->ctx; + struct rrdeng_page_descr *descr; + struct page_cache_descr *pg_cache_descr; + void *page; + struct extent_info *extent = xt_io_descr->descr_array[0]->extent; + + for (i = 0 ; i < xt_io_descr->descr_count; ++i) { + page = mallocz(RRDENG_BLOCK_SIZE); + descr = xt_io_descr->descr_array[i]; + for (j = 0, page_offset = 0 ; j < extent->number_of_pages ; ++j) { + /* care, we don't hold the descriptor mutex */ + if (!uuid_compare(*extent->pages[j]->id, *descr->id) && + extent->pages[j]->page_length == descr->page_length && + extent->pages[j]->start_time == descr->start_time && + extent->pages[j]->end_time == descr->end_time) { + break; + } + page_offset += extent->pages[j]->page_length; + + } + /* care, we don't hold the descriptor mutex */ + (void) memcpy(page, wc->xt_cache.extent_array[idx].pages + page_offset, descr->page_length); + + 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_POPULATED; + pg_cache_descr->flags &= ~RRD_PAGE_READ_PENDING; + rrdeng_page_descr_mutex_unlock(ctx, descr); + pg_cache_replaceQ_insert(ctx, descr); + if (xt_io_descr->release_descr) { + pg_cache_put(ctx, descr); + } else { + debug(D_RRDENGINE, "%s: Waking up waiters.", __func__); + pg_cache_wake_up_waiters(ctx, descr); + } + } + if (xt_io_descr->completion) + complete(xt_io_descr->completion); + freez(xt_io_descr); +} + +void read_extent_cb(uv_fs_t* req) +{ + struct rrdengine_worker_config* wc = req->loop->data; + struct rrdengine_instance *ctx = wc->ctx; + struct extent_io_descriptor *xt_io_descr; + struct rrdeng_page_descr *descr; + struct page_cache_descr *pg_cache_descr; + int ret; + unsigned i, j, count; + void *page, *uncompressed_buf = NULL; + uint32_t payload_length, payload_offset, page_offset, uncompressed_payload_length = 0; + uint8_t have_read_error = 0; + /* persistent structures */ + struct rrdeng_df_extent_header *header; + struct rrdeng_df_extent_trailer *trailer; + uLong crc; + + xt_io_descr = req->data; + header = xt_io_descr->buf; + payload_length = header->payload_length; + count = header->number_of_pages; + payload_offset = sizeof(*header) + sizeof(header->descr[0]) * count; + trailer = xt_io_descr->buf + xt_io_descr->bytes - sizeof(*trailer); + + if (req->result < 0) { + struct rrdengine_datafile *datafile = xt_io_descr->descr_array[0]->extent->datafile; + + ++ctx->stats.io_errors; + rrd_stat_atomic_add(&global_io_errors, 1); + have_read_error = 1; + error("%s: uv_fs_read - %s - extent at offset %"PRIu64"(%u) in datafile %u-%u.", __func__, + uv_strerror((int)req->result), xt_io_descr->pos, xt_io_descr->bytes, datafile->tier, datafile->fileno); + goto after_crc_check; + } + crc = crc32(0L, Z_NULL, 0); + crc = crc32(crc, xt_io_descr->buf, xt_io_descr->bytes - sizeof(*trailer)); + ret = crc32cmp(trailer->checksum, crc); +#ifdef NETDATA_INTERNAL_CHECKS + { + struct rrdengine_datafile *datafile = xt_io_descr->descr_array[0]->extent->datafile; + debug(D_RRDENGINE, "%s: Extent at offset %"PRIu64"(%u) was read from datafile %u-%u. CRC32 check: %s", __func__, + xt_io_descr->pos, xt_io_descr->bytes, datafile->tier, datafile->fileno, ret ? "FAILED" : "SUCCEEDED"); + } +#endif + if (unlikely(ret)) { + struct rrdengine_datafile *datafile = xt_io_descr->descr_array[0]->extent->datafile; + + ++ctx->stats.io_errors; + rrd_stat_atomic_add(&global_io_errors, 1); + have_read_error = 1; + error("%s: Extent at offset %"PRIu64"(%u) was read from datafile %u-%u. CRC32 check: FAILED", __func__, + xt_io_descr->pos, xt_io_descr->bytes, datafile->tier, datafile->fileno); + } + +after_crc_check: + if (!have_read_error && RRD_NO_COMPRESSION != header->compression_algorithm) { + uncompressed_payload_length = 0; + for (i = 0 ; i < count ; ++i) { + uncompressed_payload_length += header->descr[i].page_length; + } + uncompressed_buf = mallocz(uncompressed_payload_length); + ret = LZ4_decompress_safe(xt_io_descr->buf + payload_offset, uncompressed_buf, + payload_length, uncompressed_payload_length); + ctx->stats.before_decompress_bytes += payload_length; + ctx->stats.after_decompress_bytes += ret; + debug(D_RRDENGINE, "LZ4 decompressed %u bytes to %d bytes.", payload_length, ret); + /* care, we don't hold the descriptor mutex */ + } + { + uint8_t xt_is_cached = 0; + unsigned xt_idx; + struct extent_info *extent = xt_io_descr->descr_array[0]->extent; + + xt_is_cached = !lookup_in_xt_cache(wc, extent, &xt_idx); + if (xt_is_cached && check_bit(wc->xt_cache.inflight_bitmap, xt_idx)) { + struct extent_cache *xt_cache = &wc->xt_cache; + struct extent_cache_element *xt_cache_elem = &xt_cache->extent_array[xt_idx]; + struct extent_io_descriptor *curr, *next; + + if (have_read_error) { + memset(xt_cache_elem->pages, 0, sizeof(xt_cache_elem->pages)); + } else if (RRD_NO_COMPRESSION == header->compression_algorithm) { + (void)memcpy(xt_cache_elem->pages, xt_io_descr->buf + payload_offset, payload_length); + } else { + (void)memcpy(xt_cache_elem->pages, uncompressed_buf, uncompressed_payload_length); + } + /* complete all connected in-flight read requests */ + for (curr = xt_cache_elem->inflight_io_descr->next ; curr ; curr = next) { + next = curr->next; + read_cached_extent_cb(wc, xt_idx, curr); + } + xt_cache_elem->inflight_io_descr = NULL; + modify_bit(&xt_cache->inflight_bitmap, xt_idx, 0); /* not in-flight anymore */ + } + } + + for (i = 0 ; i < xt_io_descr->descr_count; ++i) { + page = mallocz(RRDENG_BLOCK_SIZE); + descr = xt_io_descr->descr_array[i]; + for (j = 0, page_offset = 0; j < count; ++j) { + /* care, we don't hold the descriptor mutex */ + if (!uuid_compare(*(uuid_t *) header->descr[j].uuid, *descr->id) && + header->descr[j].page_length == descr->page_length && + header->descr[j].start_time == descr->start_time && + header->descr[j].end_time == descr->end_time) { + break; + } + page_offset += header->descr[j].page_length; + } + /* care, we don't hold the descriptor mutex */ + if (have_read_error) { + /* Applications should make sure NULL values match 0 as does SN_EMPTY_SLOT */ + memset(page, 0, descr->page_length); + } else if (RRD_NO_COMPRESSION == header->compression_algorithm) { + (void) memcpy(page, xt_io_descr->buf + payload_offset + page_offset, descr->page_length); + } else { + (void) memcpy(page, uncompressed_buf + page_offset, descr->page_length); + } + 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_POPULATED; + pg_cache_descr->flags &= ~RRD_PAGE_READ_PENDING; + rrdeng_page_descr_mutex_unlock(ctx, descr); + pg_cache_replaceQ_insert(ctx, descr); + if (xt_io_descr->release_descr) { + pg_cache_put(ctx, descr); + } else { + debug(D_RRDENGINE, "%s: Waking up waiters.", __func__); + pg_cache_wake_up_waiters(ctx, descr); + } + } + if (!have_read_error && RRD_NO_COMPRESSION != header->compression_algorithm) { + freez(uncompressed_buf); + } + if (xt_io_descr->completion) + complete(xt_io_descr->completion); + uv_fs_req_cleanup(req); + free(xt_io_descr->buf); + freez(xt_io_descr); +} + + +static void do_read_extent(struct rrdengine_worker_config* wc, + struct rrdeng_page_descr **descr, + unsigned count, + uint8_t release_descr) +{ + struct rrdengine_instance *ctx = wc->ctx; + struct page_cache_descr *pg_cache_descr; + int ret; + unsigned i, size_bytes, pos, real_io_size; +// uint32_t payload_length; + struct extent_io_descriptor *xt_io_descr; + struct rrdengine_datafile *datafile; + struct extent_info *extent = descr[0]->extent; + uint8_t xt_is_cached = 0, xt_is_inflight = 0; + unsigned xt_idx; + + datafile = extent->datafile; + pos = extent->offset; + size_bytes = extent->size; + + xt_io_descr = callocz(1, sizeof(*xt_io_descr)); + for (i = 0 ; i < count; ++i) { + rrdeng_page_descr_mutex_lock(ctx, descr[i]); + pg_cache_descr = descr[i]->pg_cache_descr; + pg_cache_descr->flags |= RRD_PAGE_READ_PENDING; +// payload_length = descr[i]->page_length; + rrdeng_page_descr_mutex_unlock(ctx, descr[i]); + + xt_io_descr->descr_array[i] = descr[i]; + } + xt_io_descr->descr_count = count; + xt_io_descr->bytes = size_bytes; + xt_io_descr->pos = pos; + xt_io_descr->req.data = xt_io_descr; + xt_io_descr->completion = NULL; + /* xt_io_descr->descr_commit_idx_array[0] */ + xt_io_descr->release_descr = release_descr; + + xt_is_cached = !lookup_in_xt_cache(wc, extent, &xt_idx); + if (xt_is_cached) { + xt_cache_replaceQ_set_hot(wc, &wc->xt_cache.extent_array[xt_idx]); + xt_is_inflight = check_bit(wc->xt_cache.inflight_bitmap, xt_idx); + if (xt_is_inflight) { + enqueue_inflight_read_to_xt_cache(wc, xt_idx, xt_io_descr); + return; + } + return read_cached_extent_cb(wc, xt_idx, xt_io_descr); + } else { + ret = try_insert_into_xt_cache(wc, extent); + if (-1 != ret) { + xt_idx = (unsigned)ret; + modify_bit(&wc->xt_cache.inflight_bitmap, xt_idx, 1); + wc->xt_cache.extent_array[xt_idx].inflight_io_descr = xt_io_descr; + } + } + + ret = posix_memalign((void *)&xt_io_descr->buf, RRDFILE_ALIGNMENT, ALIGN_BYTES_CEILING(size_bytes)); + if (unlikely(ret)) { + fatal("posix_memalign:%s", strerror(ret)); + /* freez(xt_io_descr); + return;*/ + } + real_io_size = ALIGN_BYTES_CEILING(size_bytes); + xt_io_descr->iov = uv_buf_init((void *)xt_io_descr->buf, real_io_size); + ret = uv_fs_read(wc->loop, &xt_io_descr->req, datafile->file, &xt_io_descr->iov, 1, pos, read_extent_cb); + fatal_assert(-1 != ret); + ctx->stats.io_read_bytes += real_io_size; + ++ctx->stats.io_read_requests; + ctx->stats.io_read_extent_bytes += real_io_size; + ++ctx->stats.io_read_extents; + ctx->stats.pg_cache_backfills += count; +} + +static void commit_data_extent(struct rrdengine_worker_config* wc, struct extent_io_descriptor *xt_io_descr) +{ + struct rrdengine_instance *ctx = wc->ctx; + unsigned count, payload_length, descr_size, size_bytes; + void *buf; + /* persistent structures */ + struct rrdeng_df_extent_header *df_header; + struct rrdeng_jf_transaction_header *jf_header; + struct rrdeng_jf_store_data *jf_metric_data; + struct rrdeng_jf_transaction_trailer *jf_trailer; + uLong crc; + + df_header = xt_io_descr->buf; + count = df_header->number_of_pages; + descr_size = sizeof(*jf_metric_data->descr) * count; + payload_length = sizeof(*jf_metric_data) + descr_size; + size_bytes = sizeof(*jf_header) + payload_length + sizeof(*jf_trailer); + + buf = wal_get_transaction_buffer(wc, size_bytes); + + jf_header = buf; + jf_header->type = STORE_DATA; + jf_header->reserved = 0; + jf_header->id = ctx->commit_log.transaction_id++; + jf_header->payload_length = payload_length; + + jf_metric_data = buf + sizeof(*jf_header); + jf_metric_data->extent_offset = xt_io_descr->pos; + jf_metric_data->extent_size = xt_io_descr->bytes; + jf_metric_data->number_of_pages = count; + memcpy(jf_metric_data->descr, df_header->descr, descr_size); + + jf_trailer = buf + sizeof(*jf_header) + payload_length; + crc = crc32(0L, Z_NULL, 0); + crc = crc32(crc, buf, sizeof(*jf_header) + payload_length); + crc32set(jf_trailer->checksum, crc); +} + +static void do_commit_transaction(struct rrdengine_worker_config* wc, uint8_t type, void *data) +{ + switch (type) { + case STORE_DATA: + commit_data_extent(wc, (struct extent_io_descriptor *)data); + break; + default: + fatal_assert(type == STORE_DATA); + break; + } +} + +static void after_invalidate_oldest_committed(struct rrdengine_worker_config* wc) +{ + int error; + + error = uv_thread_join(wc->now_invalidating_dirty_pages); + if (error) { + error("uv_thread_join(): %s", uv_strerror(error)); + } + freez(wc->now_invalidating_dirty_pages); + wc->now_invalidating_dirty_pages = NULL; + wc->cleanup_thread_invalidating_dirty_pages = 0; +} + +static void invalidate_oldest_committed(void *arg) +{ + struct rrdengine_instance *ctx = arg; + struct rrdengine_worker_config *wc = &ctx->worker_config; + struct page_cache *pg_cache = &ctx->pg_cache; + int ret; + struct rrdeng_page_descr *descr; + struct page_cache_descr *pg_cache_descr; + Pvoid_t *PValue; + Word_t Index; + unsigned nr_committed_pages; + + do { + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); + for (Index = 0, + PValue = JudyLFirst(pg_cache->committed_page_index.JudyL_array, &Index, PJE0), + descr = unlikely(NULL == PValue) ? NULL : *PValue; + + descr != NULL; + + PValue = JudyLNext(pg_cache->committed_page_index.JudyL_array, &Index, PJE0), + descr = unlikely(NULL == PValue) ? NULL : *PValue) { + fatal_assert(0 != descr->page_length); + + rrdeng_page_descr_mutex_lock(ctx, descr); + pg_cache_descr = descr->pg_cache_descr; + if (!(pg_cache_descr->flags & RRD_PAGE_WRITE_PENDING) && pg_cache_try_get_unsafe(descr, 1)) { + rrdeng_page_descr_mutex_unlock(ctx, descr); + + ret = JudyLDel(&pg_cache->committed_page_index.JudyL_array, Index, PJE0); + fatal_assert(1 == ret); + break; + } + rrdeng_page_descr_mutex_unlock(ctx, descr); + } + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); + + if (!descr) { + info("Failed to invalidate any dirty pages to relieve page cache pressure."); + + goto out; + } + pg_cache_punch_hole(ctx, descr, 1, 1, NULL); + + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); + nr_committed_pages = --pg_cache->committed_page_index.nr_committed_pages; + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); + rrd_stat_atomic_add(&ctx->stats.flushing_pressure_page_deletions, 1); + rrd_stat_atomic_add(&global_flushing_pressure_page_deletions, 1); + + } while (nr_committed_pages >= pg_cache_committed_hard_limit(ctx)); +out: + wc->cleanup_thread_invalidating_dirty_pages = 1; + /* wake up event loop */ + fatal_assert(0 == uv_async_send(&wc->async)); +} + +void rrdeng_invalidate_oldest_committed(struct rrdengine_worker_config* wc) +{ + struct rrdengine_instance *ctx = wc->ctx; + struct page_cache *pg_cache = &ctx->pg_cache; + unsigned nr_committed_pages; + int error; + + if (unlikely(ctx->quiesce != NO_QUIESCE)) /* Shutting down */ + return; + + uv_rwlock_rdlock(&pg_cache->committed_page_index.lock); + nr_committed_pages = pg_cache->committed_page_index.nr_committed_pages; + uv_rwlock_rdunlock(&pg_cache->committed_page_index.lock); + + if (nr_committed_pages >= pg_cache_committed_hard_limit(ctx)) { + /* delete the oldest page in memory */ + if (wc->now_invalidating_dirty_pages) { + /* already deleting a page */ + return; + } + errno = 0; + error("Failed to flush dirty buffers quickly enough in dbengine instance \"%s\". " + "Metric data are being deleted, please reduce disk load or use a faster disk.", ctx->dbfiles_path); + + wc->now_invalidating_dirty_pages = mallocz(sizeof(*wc->now_invalidating_dirty_pages)); + wc->cleanup_thread_invalidating_dirty_pages = 0; + + error = uv_thread_create(wc->now_invalidating_dirty_pages, invalidate_oldest_committed, ctx); + if (error) { + error("uv_thread_create(): %s", uv_strerror(error)); + freez(wc->now_invalidating_dirty_pages); + wc->now_invalidating_dirty_pages = NULL; + } + } +} + +void flush_pages_cb(uv_fs_t* req) +{ + struct rrdengine_worker_config* wc = req->loop->data; + struct rrdengine_instance *ctx = wc->ctx; + struct page_cache *pg_cache = &ctx->pg_cache; + struct extent_io_descriptor *xt_io_descr; + struct rrdeng_page_descr *descr; + struct page_cache_descr *pg_cache_descr; + unsigned i, count; + + xt_io_descr = req->data; + if (req->result < 0) { + ++ctx->stats.io_errors; + rrd_stat_atomic_add(&global_io_errors, 1); + error("%s: uv_fs_write: %s", __func__, uv_strerror((int)req->result)); + } +#ifdef NETDATA_INTERNAL_CHECKS + { + struct rrdengine_datafile *datafile = xt_io_descr->descr_array[0]->extent->datafile; + debug(D_RRDENGINE, "%s: Extent at offset %"PRIu64"(%u) was written to datafile %u-%u. Waking up waiters.", + __func__, xt_io_descr->pos, xt_io_descr->bytes, datafile->tier, datafile->fileno); + } +#endif + count = xt_io_descr->descr_count; + for (i = 0 ; i < count ; ++i) { + /* care, we don't hold the descriptor mutex */ + descr = xt_io_descr->descr_array[i]; + + pg_cache_replaceQ_insert(ctx, descr); + + rrdeng_page_descr_mutex_lock(ctx, descr); + pg_cache_descr = descr->pg_cache_descr; + pg_cache_descr->flags &= ~(RRD_PAGE_DIRTY | RRD_PAGE_WRITE_PENDING); + /* wake up waiters, care no reference being held */ + pg_cache_wake_up_waiters_unsafe(descr); + rrdeng_page_descr_mutex_unlock(ctx, descr); + } + if (xt_io_descr->completion) + complete(xt_io_descr->completion); + uv_fs_req_cleanup(req); + free(xt_io_descr->buf); + freez(xt_io_descr); + + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); + pg_cache->committed_page_index.nr_committed_pages -= count; + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); + wc->inflight_dirty_pages -= count; +} + +/* + * completion must be NULL or valid. + * Returns 0 when no flushing can take place. + * Returns datafile bytes to be written on successful flushing initiation. + */ +static int do_flush_pages(struct rrdengine_worker_config* wc, int force, struct completion *completion) +{ + struct rrdengine_instance *ctx = wc->ctx; + struct page_cache *pg_cache = &ctx->pg_cache; + int ret; + int compressed_size, max_compressed_size = 0; + unsigned i, count, size_bytes, pos, real_io_size; + uint32_t uncompressed_payload_length, payload_offset; + struct rrdeng_page_descr *descr, *eligible_pages[MAX_PAGES_PER_EXTENT]; + struct page_cache_descr *pg_cache_descr; + struct extent_io_descriptor *xt_io_descr; + void *compressed_buf = NULL; + Word_t descr_commit_idx_array[MAX_PAGES_PER_EXTENT]; + Pvoid_t *PValue; + Word_t Index; + uint8_t compression_algorithm = ctx->global_compress_alg; + struct extent_info *extent; + struct rrdengine_datafile *datafile; + /* persistent structures */ + struct rrdeng_df_extent_header *header; + struct rrdeng_df_extent_trailer *trailer; + uLong crc; + + if (force) { + debug(D_RRDENGINE, "Asynchronous flushing of extent has been forced by page pressure."); + } + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); + for (Index = 0, count = 0, uncompressed_payload_length = 0, + PValue = JudyLFirst(pg_cache->committed_page_index.JudyL_array, &Index, PJE0), + descr = unlikely(NULL == PValue) ? NULL : *PValue ; + + descr != NULL && count != MAX_PAGES_PER_EXTENT ; + + PValue = JudyLNext(pg_cache->committed_page_index.JudyL_array, &Index, PJE0), + descr = unlikely(NULL == PValue) ? NULL : *PValue) { + uint8_t page_write_pending; + + fatal_assert(0 != descr->page_length); + page_write_pending = 0; + + rrdeng_page_descr_mutex_lock(ctx, descr); + pg_cache_descr = descr->pg_cache_descr; + if (!(pg_cache_descr->flags & RRD_PAGE_WRITE_PENDING)) { + page_write_pending = 1; + /* care, no reference being held */ + pg_cache_descr->flags |= RRD_PAGE_WRITE_PENDING; + uncompressed_payload_length += descr->page_length; + descr_commit_idx_array[count] = Index; + eligible_pages[count++] = descr; + } + rrdeng_page_descr_mutex_unlock(ctx, descr); + + if (page_write_pending) { + ret = JudyLDel(&pg_cache->committed_page_index.JudyL_array, Index, PJE0); + fatal_assert(1 == ret); + } + } + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); + + if (!count) { + debug(D_RRDENGINE, "%s: no pages eligible for flushing.", __func__); + if (completion) + complete(completion); + return 0; + } + wc->inflight_dirty_pages += count; + + xt_io_descr = mallocz(sizeof(*xt_io_descr)); + payload_offset = sizeof(*header) + count * sizeof(header->descr[0]); + switch (compression_algorithm) { + case RRD_NO_COMPRESSION: + size_bytes = payload_offset + uncompressed_payload_length + sizeof(*trailer); + break; + default: /* Compress */ + fatal_assert(uncompressed_payload_length < LZ4_MAX_INPUT_SIZE); + max_compressed_size = LZ4_compressBound(uncompressed_payload_length); + compressed_buf = mallocz(max_compressed_size); + size_bytes = payload_offset + MAX(uncompressed_payload_length, (unsigned)max_compressed_size) + sizeof(*trailer); + break; + } + ret = posix_memalign((void *)&xt_io_descr->buf, RRDFILE_ALIGNMENT, ALIGN_BYTES_CEILING(size_bytes)); + if (unlikely(ret)) { + fatal("posix_memalign:%s", strerror(ret)); + /* freez(xt_io_descr);*/ + } + (void) memcpy(xt_io_descr->descr_array, eligible_pages, sizeof(struct rrdeng_page_descr *) * count); + xt_io_descr->descr_count = count; + + pos = 0; + header = xt_io_descr->buf; + header->compression_algorithm = compression_algorithm; + header->number_of_pages = count; + pos += sizeof(*header); + + extent = mallocz(sizeof(*extent) + count * sizeof(extent->pages[0])); + datafile = ctx->datafiles.last; /* TODO: check for exceeded size quota */ + extent->offset = datafile->pos; + extent->number_of_pages = count; + extent->datafile = datafile; + extent->next = NULL; + + for (i = 0 ; i < count ; ++i) { + /* This is here for performance reasons */ + xt_io_descr->descr_commit_idx_array[i] = descr_commit_idx_array[i]; + + descr = xt_io_descr->descr_array[i]; + header->descr[i].type = PAGE_METRICS; + uuid_copy(*(uuid_t *)header->descr[i].uuid, *descr->id); + header->descr[i].page_length = descr->page_length; + header->descr[i].start_time = descr->start_time; + header->descr[i].end_time = descr->end_time; + pos += sizeof(header->descr[i]); + } + for (i = 0 ; i < count ; ++i) { + descr = xt_io_descr->descr_array[i]; + /* care, we don't hold the descriptor mutex */ + (void) memcpy(xt_io_descr->buf + pos, descr->pg_cache_descr->page, descr->page_length); + descr->extent = extent; + extent->pages[i] = descr; + + pos += descr->page_length; + } + df_extent_insert(extent); + + switch (compression_algorithm) { + case RRD_NO_COMPRESSION: + header->payload_length = uncompressed_payload_length; + break; + default: /* Compress */ + compressed_size = LZ4_compress_default(xt_io_descr->buf + payload_offset, compressed_buf, + uncompressed_payload_length, max_compressed_size); + ctx->stats.before_compress_bytes += uncompressed_payload_length; + ctx->stats.after_compress_bytes += compressed_size; + debug(D_RRDENGINE, "LZ4 compressed %"PRIu32" bytes to %d bytes.", uncompressed_payload_length, compressed_size); + (void) memcpy(xt_io_descr->buf + payload_offset, compressed_buf, compressed_size); + freez(compressed_buf); + size_bytes = payload_offset + compressed_size + sizeof(*trailer); + header->payload_length = compressed_size; + break; + } + extent->size = size_bytes; + xt_io_descr->bytes = size_bytes; + xt_io_descr->pos = datafile->pos; + xt_io_descr->req.data = xt_io_descr; + xt_io_descr->completion = completion; + + trailer = xt_io_descr->buf + size_bytes - sizeof(*trailer); + crc = crc32(0L, Z_NULL, 0); + crc = crc32(crc, xt_io_descr->buf, size_bytes - sizeof(*trailer)); + crc32set(trailer->checksum, crc); + + real_io_size = ALIGN_BYTES_CEILING(size_bytes); + xt_io_descr->iov = uv_buf_init((void *)xt_io_descr->buf, real_io_size); + ret = uv_fs_write(wc->loop, &xt_io_descr->req, datafile->file, &xt_io_descr->iov, 1, datafile->pos, flush_pages_cb); + fatal_assert(-1 != ret); + ctx->stats.io_write_bytes += real_io_size; + ++ctx->stats.io_write_requests; + ctx->stats.io_write_extent_bytes += real_io_size; + ++ctx->stats.io_write_extents; + do_commit_transaction(wc, STORE_DATA, xt_io_descr); + datafile->pos += ALIGN_BYTES_CEILING(size_bytes); + ctx->disk_space += ALIGN_BYTES_CEILING(size_bytes); + rrdeng_test_quota(wc); + + return ALIGN_BYTES_CEILING(size_bytes); +} + +static void after_delete_old_data(struct rrdengine_worker_config* wc) +{ + struct rrdengine_instance *ctx = wc->ctx; + struct rrdengine_datafile *datafile; + struct rrdengine_journalfile *journalfile; + unsigned deleted_bytes, journalfile_bytes, datafile_bytes; + int ret, error; + char path[RRDENG_PATH_MAX]; + + datafile = ctx->datafiles.first; + journalfile = datafile->journalfile; + datafile_bytes = datafile->pos; + journalfile_bytes = journalfile->pos; + deleted_bytes = 0; + + info("Deleting data and journal file pair."); + datafile_list_delete(ctx, datafile); + ret = destroy_journal_file(journalfile, datafile); + if (!ret) { + generate_journalfilepath(datafile, path, sizeof(path)); + info("Deleted journal file \"%s\".", path); + deleted_bytes += journalfile_bytes; + } + ret = destroy_data_file(datafile); + if (!ret) { + generate_datafilepath(datafile, path, sizeof(path)); + info("Deleted data file \"%s\".", path); + deleted_bytes += datafile_bytes; + } + freez(journalfile); + freez(datafile); + + ctx->disk_space -= deleted_bytes; + info("Reclaimed %u bytes of disk space.", deleted_bytes); + + error = uv_thread_join(wc->now_deleting_files); + if (error) { + error("uv_thread_join(): %s", uv_strerror(error)); + } + freez(wc->now_deleting_files); + /* unfreeze command processing */ + wc->now_deleting_files = NULL; + + wc->cleanup_thread_deleting_files = 0; + + /* interrupt event loop */ + uv_stop(wc->loop); +} + +static void delete_old_data(void *arg) +{ + struct rrdengine_instance *ctx = arg; + struct rrdengine_worker_config* wc = &ctx->worker_config; + struct rrdengine_datafile *datafile; + struct extent_info *extent, *next; + struct rrdeng_page_descr *descr; + unsigned count, i; + uint8_t can_delete_metric; + uuid_t metric_id; + + /* Safe to use since it will be deleted after we are done */ + datafile = ctx->datafiles.first; + + for (extent = datafile->extents.first ; extent != NULL ; extent = next) { + count = extent->number_of_pages; + for (i = 0 ; i < count ; ++i) { + descr = extent->pages[i]; + can_delete_metric = pg_cache_punch_hole(ctx, descr, 0, 0, &metric_id); + if (unlikely(can_delete_metric && ctx->metalog_ctx->initialized)) { + /* + * If the metric is empty, has no active writers and if the metadata log has been initialized then + * attempt to delete the corresponding netdata dimension. + */ + metalog_delete_dimension_by_uuid(ctx->metalog_ctx, &metric_id); + } + } + next = extent->next; + freez(extent); + } + wc->cleanup_thread_deleting_files = 1; + /* wake up event loop */ + fatal_assert(0 == uv_async_send(&wc->async)); +} + +void rrdeng_test_quota(struct rrdengine_worker_config* wc) +{ + struct rrdengine_instance *ctx = wc->ctx; + struct rrdengine_datafile *datafile; + unsigned current_size, target_size; + uint8_t out_of_space, only_one_datafile; + int ret, error; + + out_of_space = 0; + /* Do not allow the pinned pages to exceed the disk space quota to avoid deadlocks */ + if (unlikely(ctx->disk_space > MAX(ctx->max_disk_space, 2 * ctx->metric_API_max_producers * RRDENG_BLOCK_SIZE))) { + out_of_space = 1; + } + datafile = ctx->datafiles.last; + current_size = datafile->pos; + target_size = ctx->max_disk_space / TARGET_DATAFILES; + target_size = MIN(target_size, MAX_DATAFILE_SIZE); + target_size = MAX(target_size, MIN_DATAFILE_SIZE); + only_one_datafile = (datafile == ctx->datafiles.first) ? 1 : 0; + if (unlikely(current_size >= target_size || (out_of_space && only_one_datafile))) { + /* Finalize data and journal file and create a new pair */ + wal_flush_transaction_buffer(wc); + ret = create_new_datafile_pair(ctx, 1, ctx->last_fileno + 1); + if (likely(!ret)) { + ++ctx->last_fileno; + } + } + if (unlikely(out_of_space && NO_QUIESCE == ctx->quiesce)) { + /* delete old data */ + if (wc->now_deleting_files) { + /* already deleting data */ + return; + } + if (NULL == ctx->datafiles.first->next) { + error("Cannot delete data file \"%s/"DATAFILE_PREFIX RRDENG_FILE_NUMBER_PRINT_TMPL DATAFILE_EXTENSION"\"" + " to reclaim space, there are no other file pairs left.", + ctx->dbfiles_path, ctx->datafiles.first->tier, ctx->datafiles.first->fileno); + return; + } + info("Deleting data file \"%s/"DATAFILE_PREFIX RRDENG_FILE_NUMBER_PRINT_TMPL DATAFILE_EXTENSION"\".", + ctx->dbfiles_path, ctx->datafiles.first->tier, ctx->datafiles.first->fileno); + wc->now_deleting_files = mallocz(sizeof(*wc->now_deleting_files)); + wc->cleanup_thread_deleting_files = 0; + + error = uv_thread_create(wc->now_deleting_files, delete_old_data, ctx); + if (error) { + error("uv_thread_create(): %s", uv_strerror(error)); + freez(wc->now_deleting_files); + wc->now_deleting_files = NULL; + } + } +} + +static inline int rrdeng_threads_alive(struct rrdengine_worker_config* wc) +{ + if (wc->now_invalidating_dirty_pages || wc->now_deleting_files) { + return 1; + } + return 0; +} + +static void rrdeng_cleanup_finished_threads(struct rrdengine_worker_config* wc) +{ + struct rrdengine_instance *ctx = wc->ctx; + + if (unlikely(wc->cleanup_thread_invalidating_dirty_pages)) { + after_invalidate_oldest_committed(wc); + } + if (unlikely(wc->cleanup_thread_deleting_files)) { + after_delete_old_data(wc); + } + if (unlikely(SET_QUIESCE == ctx->quiesce && !rrdeng_threads_alive(wc))) { + ctx->quiesce = QUIESCED; + complete(&ctx->rrdengine_completion); + } +} + +/* return 0 on success */ +int init_rrd_files(struct rrdengine_instance *ctx) +{ + return init_data_files(ctx); +} + +void finalize_rrd_files(struct rrdengine_instance *ctx) +{ + return finalize_data_files(ctx); +} + +void rrdeng_init_cmd_queue(struct rrdengine_worker_config* wc) +{ + wc->cmd_queue.head = wc->cmd_queue.tail = 0; + wc->queue_size = 0; + fatal_assert(0 == uv_cond_init(&wc->cmd_cond)); + fatal_assert(0 == uv_mutex_init(&wc->cmd_mutex)); +} + +void rrdeng_enq_cmd(struct rrdengine_worker_config* wc, struct rrdeng_cmd *cmd) +{ + unsigned queue_size; + + /* wait for free space in queue */ + uv_mutex_lock(&wc->cmd_mutex); + while ((queue_size = wc->queue_size) == RRDENG_CMD_Q_MAX_SIZE) { + uv_cond_wait(&wc->cmd_cond, &wc->cmd_mutex); + } + fatal_assert(queue_size < RRDENG_CMD_Q_MAX_SIZE); + /* enqueue command */ + wc->cmd_queue.cmd_array[wc->cmd_queue.tail] = *cmd; + wc->cmd_queue.tail = wc->cmd_queue.tail != RRDENG_CMD_Q_MAX_SIZE - 1 ? + wc->cmd_queue.tail + 1 : 0; + wc->queue_size = queue_size + 1; + uv_mutex_unlock(&wc->cmd_mutex); + + /* wake up event loop */ + fatal_assert(0 == uv_async_send(&wc->async)); +} + +struct rrdeng_cmd rrdeng_deq_cmd(struct rrdengine_worker_config* wc) +{ + struct rrdeng_cmd ret; + unsigned queue_size; + + uv_mutex_lock(&wc->cmd_mutex); + queue_size = wc->queue_size; + if (queue_size == 0) { + ret.opcode = RRDENG_NOOP; + } else { + /* dequeue command */ + ret = wc->cmd_queue.cmd_array[wc->cmd_queue.head]; + if (queue_size == 1) { + wc->cmd_queue.head = wc->cmd_queue.tail = 0; + } else { + wc->cmd_queue.head = wc->cmd_queue.head != RRDENG_CMD_Q_MAX_SIZE - 1 ? + wc->cmd_queue.head + 1 : 0; + } + wc->queue_size = queue_size - 1; + + /* wake up producers */ + uv_cond_signal(&wc->cmd_cond); + } + uv_mutex_unlock(&wc->cmd_mutex); + + return ret; +} + +void async_cb(uv_async_t *handle) +{ + uv_stop(handle->loop); + uv_update_time(handle->loop); + debug(D_RRDENGINE, "%s called, active=%d.", __func__, uv_is_active((uv_handle_t *)handle)); +} + +/* Flushes dirty pages when timer expires */ +#define TIMER_PERIOD_MS (1000) + +void timer_cb(uv_timer_t* handle) +{ + struct rrdengine_worker_config* wc = handle->data; + struct rrdengine_instance *ctx = wc->ctx; + + uv_stop(handle->loop); + uv_update_time(handle->loop); + if (unlikely(!ctx->metalog_ctx->initialized)) + return; /* Wait for the metadata log to initialize */ + rrdeng_test_quota(wc); + debug(D_RRDENGINE, "%s: timeout reached.", __func__); + if (likely(!wc->now_deleting_files && !wc->now_invalidating_dirty_pages)) { + /* There is free space so we can write to disk and we are not actively deleting dirty buffers */ + struct page_cache *pg_cache = &ctx->pg_cache; + unsigned long total_bytes, bytes_written, nr_committed_pages, bytes_to_write = 0, producers, low_watermark, + high_watermark; + + uv_rwlock_rdlock(&pg_cache->committed_page_index.lock); + nr_committed_pages = pg_cache->committed_page_index.nr_committed_pages; + uv_rwlock_rdunlock(&pg_cache->committed_page_index.lock); + producers = ctx->metric_API_max_producers; + /* are flushable pages more than 25% of the maximum page cache size */ + high_watermark = (ctx->max_cache_pages * 25LLU) / 100; + low_watermark = (ctx->max_cache_pages * 5LLU) / 100; /* 5%, must be smaller than high_watermark */ + + /* Flush more pages only if disk can keep up */ + if (wc->inflight_dirty_pages < high_watermark + producers) { + if (nr_committed_pages > producers && + /* committed to be written pages are more than the produced number */ + nr_committed_pages - producers > high_watermark) { + /* Flushing speed must increase to stop page cache from filling with dirty pages */ + bytes_to_write = (nr_committed_pages - producers - low_watermark) * RRDENG_BLOCK_SIZE; + } + bytes_to_write = MAX(DATAFILE_IDEAL_IO_SIZE, bytes_to_write); + + debug(D_RRDENGINE, "Flushing pages to disk."); + for (total_bytes = bytes_written = do_flush_pages(wc, 0, NULL); + bytes_written && (total_bytes < bytes_to_write); + total_bytes += bytes_written) { + bytes_written = do_flush_pages(wc, 0, NULL); + } + } + } +#ifdef NETDATA_INTERNAL_CHECKS + { + char buf[4096]; + debug(D_RRDENGINE, "%s", get_rrdeng_statistics(wc->ctx, buf, sizeof(buf))); + } +#endif +} + +#define MAX_CMD_BATCH_SIZE (256) + +void rrdeng_worker(void* arg) +{ + struct rrdengine_worker_config* wc = arg; + struct rrdengine_instance *ctx = wc->ctx; + uv_loop_t* loop; + int shutdown, ret; + enum rrdeng_opcode opcode; + uv_timer_t timer_req; + struct rrdeng_cmd cmd; + unsigned cmd_batch_size; + + rrdeng_init_cmd_queue(wc); + + loop = wc->loop = mallocz(sizeof(uv_loop_t)); + ret = uv_loop_init(loop); + if (ret) { + error("uv_loop_init(): %s", uv_strerror(ret)); + goto error_after_loop_init; + } + loop->data = wc; + + ret = uv_async_init(wc->loop, &wc->async, async_cb); + if (ret) { + error("uv_async_init(): %s", uv_strerror(ret)); + goto error_after_async_init; + } + wc->async.data = wc; + + wc->now_deleting_files = NULL; + wc->cleanup_thread_deleting_files = 0; + + wc->now_invalidating_dirty_pages = NULL; + wc->cleanup_thread_invalidating_dirty_pages = 0; + wc->inflight_dirty_pages = 0; + + /* dirty page flushing timer */ + ret = uv_timer_init(loop, &timer_req); + if (ret) { + error("uv_timer_init(): %s", uv_strerror(ret)); + goto error_after_timer_init; + } + timer_req.data = wc; + + wc->error = 0; + /* wake up initialization thread */ + complete(&ctx->rrdengine_completion); + + fatal_assert(0 == uv_timer_start(&timer_req, timer_cb, TIMER_PERIOD_MS, TIMER_PERIOD_MS)); + shutdown = 0; + while (likely(shutdown == 0 || rrdeng_threads_alive(wc))) { + uv_run(loop, UV_RUN_DEFAULT); + rrdeng_cleanup_finished_threads(wc); + + /* wait for commands */ + cmd_batch_size = 0; + do { + /* + * Avoid starving the loop when there are too many commands coming in. + * timer_cb will interrupt the loop again to allow serving more commands. + */ + if (unlikely(cmd_batch_size >= MAX_CMD_BATCH_SIZE)) + break; + + cmd = rrdeng_deq_cmd(wc); + opcode = cmd.opcode; + ++cmd_batch_size; + + switch (opcode) { + case RRDENG_NOOP: + /* the command queue was empty, do nothing */ + break; + case RRDENG_SHUTDOWN: + shutdown = 1; + break; + case RRDENG_QUIESCE: + ctx->drop_metrics_under_page_cache_pressure = 0; + ctx->quiesce = SET_QUIESCE; + fatal_assert(0 == uv_timer_stop(&timer_req)); + uv_close((uv_handle_t *)&timer_req, NULL); + while (do_flush_pages(wc, 1, NULL)) { + ; /* Force flushing of all committed pages. */ + } + wal_flush_transaction_buffer(wc); + if (!rrdeng_threads_alive(wc)) { + ctx->quiesce = QUIESCED; + complete(&ctx->rrdengine_completion); + } + break; + case RRDENG_READ_PAGE: + do_read_extent(wc, &cmd.read_page.page_cache_descr, 1, 0); + break; + case RRDENG_READ_EXTENT: + do_read_extent(wc, cmd.read_extent.page_cache_descr, cmd.read_extent.page_count, 1); + break; + case RRDENG_COMMIT_PAGE: + do_commit_transaction(wc, STORE_DATA, NULL); + break; + case RRDENG_FLUSH_PAGES: { + if (wc->now_invalidating_dirty_pages) { + /* Do not flush if the disk cannot keep up */ + complete(cmd.completion); + } else { + (void)do_flush_pages(wc, 1, cmd.completion); + } + break; + case RRDENG_INVALIDATE_OLDEST_MEMORY_PAGE: + rrdeng_invalidate_oldest_committed(wc); + break; + } + default: + debug(D_RRDENGINE, "%s: default.", __func__); + break; + } + } while (opcode != RRDENG_NOOP); + } + + /* cleanup operations of the event loop */ + info("Shutting down RRD engine event loop."); + + /* + * uv_async_send after uv_close does not seem to crash in linux at the moment, + * it is however undocumented behaviour and we need to be aware if this becomes + * an issue in the future. + */ + uv_close((uv_handle_t *)&wc->async, NULL); + + while (do_flush_pages(wc, 1, NULL)) { + ; /* Force flushing of all committed pages. */ + } + wal_flush_transaction_buffer(wc); + uv_run(loop, UV_RUN_DEFAULT); + + info("Shutting down RRD engine event loop complete."); + /* TODO: don't let the API block by waiting to enqueue commands */ + uv_cond_destroy(&wc->cmd_cond); +/* uv_mutex_destroy(&wc->cmd_mutex); */ + fatal_assert(0 == uv_loop_close(loop)); + freez(loop); + + return; + +error_after_timer_init: + uv_close((uv_handle_t *)&wc->async, NULL); +error_after_async_init: + fatal_assert(0 == uv_loop_close(loop)); +error_after_loop_init: + freez(loop); + + wc->error = UV_EAGAIN; + /* wake up initialization thread */ + complete(&ctx->rrdengine_completion); +} + +/* C entry point for development purposes + * make "LDFLAGS=-errdengine_main" + */ +void rrdengine_main(void) +{ + int ret; + struct rrdengine_instance *ctx; + + sanity_check(); + ret = rrdeng_init(NULL, &ctx, "/tmp", RRDENG_MIN_PAGE_CACHE_SIZE_MB, RRDENG_MIN_DISK_SPACE_MB); + if (ret) { + exit(ret); + } + rrdeng_exit(ctx); + fprintf(stderr, "Hello world!"); + exit(0); +} |