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authorLennart Weller <lhw@ring0.de>2017-01-24 15:21:09 +0000
committerLennart Weller <lhw@ring0.de>2017-01-24 15:21:09 +0000
commit3ed3b02ed96ddab1c084811f3579b3a2aec83e04 (patch)
tree7a61ab288ae47800c4f11be5677d6ad8288dcd98 /src/backends.c
parentNew upstream version 1.4.0+dfsg (diff)
downloadnetdata-3ed3b02ed96ddab1c084811f3579b3a2aec83e04.tar.xz
netdata-3ed3b02ed96ddab1c084811f3579b3a2aec83e04.zip
New upstream version 1.5.0+dfsgupstream/1.5.0+dfsg
Diffstat (limited to '')
-rw-r--r--src/backends.c549
1 files changed, 549 insertions, 0 deletions
diff --git a/src/backends.c b/src/backends.c
new file mode 100644
index 000000000..1272d0473
--- /dev/null
+++ b/src/backends.c
@@ -0,0 +1,549 @@
+#include "common.h"
+
+#define BACKEND_SOURCE_DATA_AS_COLLECTED 0x00000001
+#define BACKEND_SOURCE_DATA_AVERAGE 0x00000002
+#define BACKEND_SOURCE_DATA_SUM 0x00000004
+
+static inline calculated_number backend_calculate_value_from_stored_data(RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ time_t first_t = rrdset_first_entry_t(st);
+ time_t last_t = rrdset_last_entry_t(st);
+
+ if(unlikely(before - after < st->update_every && after != after - after % st->update_every))
+ // when st->update_every is bigger than the frequency we send data to backend
+ // skip the iterations that are not aligned to the database
+ return NAN;
+
+ // align the time-frame
+ // for 'after' also skip the first value by adding st->update_every
+ after = after - after % st->update_every + st->update_every;
+ before = before - before % st->update_every;
+
+ if(unlikely(after < first_t))
+ after = first_t;
+
+ if(unlikely(after > before))
+ // this can happen when the st->update_every > before - after
+ before = after;
+
+ if(unlikely(before > last_t))
+ before = last_t;
+
+ size_t counter = 0;
+ calculated_number sum = 0;
+
+ long start_at_slot = rrdset_time2slot(st, before),
+ stop_at_slot = rrdset_time2slot(st, after),
+ slot, stop_now = 0;
+
+ for(slot = start_at_slot; !stop_now ; slot--) {
+ if(unlikely(slot < 0)) slot = st->entries - 1;
+ if(unlikely(slot == stop_at_slot)) stop_now = 1;
+
+ storage_number n = rd->values[slot];
+ if(unlikely(!does_storage_number_exist(n))) continue;
+
+ calculated_number value = unpack_storage_number(n);
+ sum += value;
+ counter++;
+ }
+
+ if(unlikely(!counter))
+ return NAN;
+
+ if(unlikely(options & BACKEND_SOURCE_DATA_SUM))
+ return sum;
+
+ return sum / (calculated_number)counter;
+}
+
+static inline int format_dimension_collected_graphite_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ (void)host;
+ (void)after;
+ (void)before;
+ (void)options;
+ buffer_sprintf(b, "%s.%s.%s.%s " COLLECTED_NUMBER_FORMAT " %u\n", prefix, hostname, st->id, rd->id, rd->last_collected_value, (uint32_t)rd->last_collected_time.tv_sec);
+ return 1;
+}
+
+static inline int format_dimension_stored_graphite_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ (void)host;
+ calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
+ if(!isnan(value)) {
+ buffer_sprintf(b, "%s.%s.%s.%s " CALCULATED_NUMBER_FORMAT " %u\n", prefix, hostname, st->id, rd->id, value, (uint32_t) before);
+ return 1;
+ }
+ return 0;
+}
+
+static inline int format_dimension_collected_opentsdb_telnet(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ (void)host;
+ (void)after;
+ (void)before;
+ (void)options;
+ buffer_sprintf(b, "put %s.%s.%s %u " COLLECTED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t)rd->last_collected_time.tv_sec, rd->last_collected_value, hostname);
+ return 1;
+}
+
+static inline int format_dimension_stored_opentsdb_telnet(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
+ (void)host;
+ calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
+ if(!isnan(value)) {
+ buffer_sprintf(b, "put %s.%s.%s %u " CALCULATED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t) before, value, hostname);
+ return 1;
+ }
+ return 0;
+}
+
+static inline int process_graphite_response(BUFFER *b) {
+ char sample[1024];
+ const char *s = buffer_tostring(b);
+ char *d = sample, *e = &sample[sizeof(sample) - 1];
+
+ for(; *s && d < e ;s++) {
+ char c = *s;
+ if(unlikely(!isprint(c))) c = ' ';
+ *d++ = c;
+ }
+ *d = '\0';
+
+ info("Received %zu bytes from graphite backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
+ buffer_flush(b);
+ return 0;
+}
+
+static inline int process_opentsdb_response(BUFFER *b) {
+ char sample[1024];
+ const char *s = buffer_tostring(b);
+ char *d = sample, *e = &sample[sizeof(sample) - 1];
+
+ for(; *s && d < e ;s++) {
+ char c = *s;
+ if(unlikely(!isprint(c))) c = ' ';
+ *d++ = c;
+ }
+ *d = '\0';
+
+ info("Received %zu bytes from opentsdb backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
+ buffer_flush(b);
+ return 0;
+}
+
+void *backends_main(void *ptr) {
+ struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
+
+ BUFFER *b = buffer_create(1), *response = buffer_create(1);
+ int (*backend_request_formatter)(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) = NULL;
+ int (*backend_response_checker)(BUFFER *b) = NULL;
+
+ info("BACKEND thread created with task id %d", gettid());
+
+ if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
+ error("Cannot set pthread cancel type to DEFERRED.");
+
+ if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
+ error("Cannot set pthread cancel state to ENABLE.");
+
+ // ------------------------------------------------------------------------
+ // collect configuration options
+
+ struct timeval timeout = {
+ .tv_sec = 0,
+ .tv_usec = 0
+ };
+ int default_port = 0;
+ int sock = -1;
+ uint32_t options;
+ int enabled = config_get_boolean("backend", "enabled", 0);
+ const char *source = config_get("backend", "data source", "average");
+ const char *type = config_get("backend", "type", "graphite");
+ const char *destination = config_get("backend", "destination", "localhost");
+ const char *prefix = config_get("backend", "prefix", "netdata");
+ const char *hostname = config_get("backend", "hostname", localhost.hostname);
+ int frequency = (int)config_get_number("backend", "update every", 10);
+ int buffer_on_failures = (int)config_get_number("backend", "buffer on failures", 10);
+ long timeoutms = config_get_number("backend", "timeout ms", frequency * 2 * 1000);
+
+ // ------------------------------------------------------------------------
+ // validate configuration options
+ // and prepare for sending data to our backend
+ if(!enabled || frequency < 1)
+ goto cleanup;
+
+ if(!strcmp(source, "as collected")) {
+ options = BACKEND_SOURCE_DATA_AS_COLLECTED;
+ }
+ else if(!strcmp(source, "average")) {
+ options = BACKEND_SOURCE_DATA_AVERAGE;
+ }
+ else if(!strcmp(source, "sum") || !strcmp(source, "volume")) {
+ options = BACKEND_SOURCE_DATA_SUM;
+ }
+ else {
+ error("Invalid data source method '%s' for backend given. Disabling backed.", source);
+ goto cleanup;
+ }
+
+ if(!strcmp(type, "graphite") || !strcmp(type, "graphite:plaintext")) {
+ default_port = 2003;
+ if(options == BACKEND_SOURCE_DATA_AS_COLLECTED)
+ backend_request_formatter = format_dimension_collected_graphite_plaintext;
+ else
+ backend_request_formatter = format_dimension_stored_graphite_plaintext;
+
+ backend_response_checker = process_graphite_response;
+ }
+ else if(!strcmp(type, "opentsdb") || !strcmp(type, "opentsdb:telnet")) {
+ default_port = 4242;
+ if(options == BACKEND_SOURCE_DATA_AS_COLLECTED)
+ backend_request_formatter = format_dimension_collected_opentsdb_telnet;
+ else
+ backend_request_formatter = format_dimension_stored_opentsdb_telnet;
+
+ backend_response_checker = process_opentsdb_response;
+ }
+ else {
+ error("Unknown backend type '%s'", type);
+ goto cleanup;
+ }
+
+ if(backend_request_formatter == NULL || backend_response_checker == NULL) {
+ error("backend is misconfigured - disabling it.");
+ goto cleanup;
+ }
+
+ if(timeoutms < 1) {
+ error("BACKED invalid timeout %ld ms given. Assuming %d ms.", timeoutms, frequency * 2 * 1000);
+ timeoutms = frequency * 2 * 1000;
+ }
+ timeout.tv_sec = (timeoutms * 1000) / 1000000;
+ timeout.tv_usec = (timeoutms * 1000) % 1000000;
+
+ // ------------------------------------------------------------------------
+ // prepare the charts for monitoring the backend
+
+ struct rusage thread;
+
+ collected_number
+ chart_buffered_metrics = 0,
+ chart_lost_metrics = 0,
+ chart_sent_metrics = 0,
+ chart_buffered_bytes = 0,
+ chart_received_bytes = 0,
+ chart_sent_bytes = 0,
+ chart_receptions = 0,
+ chart_transmission_successes = 0,
+ chart_transmission_failures = 0,
+ chart_data_lost_events = 0,
+ chart_lost_bytes = 0,
+ chart_backend_reconnects = 0,
+ chart_backend_latency = 0;
+
+ RRDSET *chart_metrics = rrdset_find("netdata.backend_metrics");
+ if(!chart_metrics) {
+ chart_metrics = rrdset_create("netdata", "backend_metrics", NULL, "backend", NULL, "Netdata Buffered Metrics", "metrics", 130600, frequency, RRDSET_TYPE_LINE);
+ rrddim_add(chart_metrics, "buffered", NULL, 1, 1, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_metrics, "lost", NULL, 1, 1, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_metrics, "sent", NULL, 1, 1, RRDDIM_ABSOLUTE);
+ }
+
+ RRDSET *chart_bytes = rrdset_find("netdata.backend_bytes");
+ if(!chart_bytes) {
+ chart_bytes = rrdset_create("netdata", "backend_bytes", NULL, "backend", NULL, "Netdata Backend Data Size", "KB", 130610, frequency, RRDSET_TYPE_AREA);
+ rrddim_add(chart_bytes, "buffered", NULL, 1, 1024, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_bytes, "lost", NULL, 1, 1024, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_bytes, "sent", NULL, 1, 1024, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_bytes, "received", NULL, 1, 1024, RRDDIM_ABSOLUTE);
+ }
+
+ RRDSET *chart_ops = rrdset_find("netdata.backend_ops");
+ if(!chart_ops) {
+ chart_ops = rrdset_create("netdata", "backend_ops", NULL, "backend", NULL, "Netdata Backend Operations", "operations", 130630, frequency, RRDSET_TYPE_LINE);
+ rrddim_add(chart_ops, "write", NULL, 1, 1, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_ops, "discard", NULL, 1, 1, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_ops, "reconnect", NULL, 1, 1, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_ops, "failure", NULL, 1, 1, RRDDIM_ABSOLUTE);
+ rrddim_add(chart_ops, "read", NULL, 1, 1, RRDDIM_ABSOLUTE);
+ }
+
+ /*
+ * this is misleading - we can only measure the time we need to send data
+ * this time is not related to the time required for the data to travel to
+ * the backend database and the time that server needed to process them
+ *
+ * issue #1432 and https://www.softlab.ntua.gr/facilities/documentation/unix/unix-socket-faq/unix-socket-faq-2.html
+ *
+ RRDSET *chart_latency = rrdset_find("netdata.backend_latency");
+ if(!chart_latency) {
+ chart_latency = rrdset_create("netdata", "backend_latency", NULL, "backend", NULL, "Netdata Backend Latency", "ms", 130620, frequency, RRDSET_TYPE_AREA);
+ rrddim_add(chart_latency, "latency", NULL, 1, 1000, RRDDIM_ABSOLUTE);
+ }
+ */
+
+ RRDSET *chart_rusage = rrdset_find("netdata.backend_thread_cpu");
+ if(!chart_rusage) {
+ chart_rusage = rrdset_create("netdata", "backend_thread_cpu", NULL, "backend", NULL, "NetData Backend Thread CPU usage", "milliseconds/s", 130630, frequency, RRDSET_TYPE_STACKED);
+ rrddim_add(chart_rusage, "user", NULL, 1, 1000, RRDDIM_INCREMENTAL);
+ rrddim_add(chart_rusage, "system", NULL, 1, 1000, RRDDIM_INCREMENTAL);
+ }
+
+ // ------------------------------------------------------------------------
+ // prepare the backend main loop
+
+ info("BACKEND configured ('%s' on '%s' sending '%s' data, every %d seconds, as host '%s', with prefix '%s')", type, destination, source, frequency, hostname, prefix);
+
+ usec_t step_ut = frequency * USEC_PER_SEC;
+ usec_t random_ut = now_realtime_usec() % (step_ut / 2);
+ time_t before = (time_t)((now_realtime_usec() - step_ut) / USEC_PER_SEC);
+ time_t after = before;
+ int failures = 0;
+
+ for(;;) {
+ // ------------------------------------------------------------------------
+ // wait for the next iteration point
+
+ usec_t now_ut = now_realtime_usec();
+ usec_t next_ut = now_ut - (now_ut % step_ut) + step_ut;
+ before = (time_t)(next_ut / USEC_PER_SEC);
+
+ // add a little delay (1/4 of the step) plus some randomness
+ next_ut += (step_ut / 4) + random_ut;
+
+ while(now_ut < next_ut) {
+ sleep_usec(next_ut - now_ut);
+ now_ut = now_realtime_usec();
+ }
+
+ // ------------------------------------------------------------------------
+ // add to the buffer the data we need to send to the backend
+
+ RRDSET *st;
+ int pthreadoldcancelstate;
+
+ if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
+ error("Cannot set pthread cancel state to DISABLE.");
+
+ rrdhost_rdlock(&localhost);
+ for(st = localhost.rrdset_root; st ;st = st->next) {
+ pthread_rwlock_rdlock(&st->rwlock);
+
+ RRDDIM *rd;
+ for(rd = st->dimensions; rd ;rd = rd->next) {
+ if(rd->last_collected_time.tv_sec >= after)
+ chart_buffered_metrics += backend_request_formatter(b, prefix, &localhost, hostname, st, rd, after, before, options);
+ }
+
+ pthread_rwlock_unlock(&st->rwlock);
+ }
+ rrdhost_unlock(&localhost);
+
+ if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
+ error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
+
+ // ------------------------------------------------------------------------
+
+ chart_buffered_bytes = (collected_number)buffer_strlen(b);
+
+ // reset the monitoring chart counters
+ chart_received_bytes =
+ chart_sent_bytes =
+ chart_sent_metrics =
+ chart_lost_metrics =
+ chart_transmission_successes =
+ chart_transmission_failures =
+ chart_data_lost_events =
+ chart_lost_bytes =
+ chart_backend_reconnects =
+ chart_backend_latency = 0;
+
+ if(unlikely(netdata_exit)) break;
+
+ //fprintf(stderr, "\nBACKEND BEGIN:\n%s\nBACKEND END\n", buffer_tostring(b)); // FIXME
+ //fprintf(stderr, "after = %lu, before = %lu\n", after, before);
+
+ // ------------------------------------------------------------------------
+ // if we are connected, receive a response, without blocking
+
+ if(likely(sock != -1)) {
+ errno = 0;
+
+ // loop through to collect all data
+ while(sock != -1 && errno != EWOULDBLOCK) {
+ buffer_need_bytes(response, 4096);
+
+ ssize_t r = recv(sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
+ if(likely(r > 0)) {
+ // we received some data
+ response->len += r;
+ chart_received_bytes += r;
+ chart_receptions++;
+ }
+ else if(r == 0) {
+ error("Backend '%s' closed the socket", destination);
+ close(sock);
+ sock = -1;
+ }
+ else {
+ // failed to receive data
+ if(errno != EAGAIN && errno != EWOULDBLOCK) {
+ error("Cannot receive data from backend '%s'.", destination);
+ }
+ }
+ }
+
+ // if we received data, process them
+ if(buffer_strlen(response))
+ backend_response_checker(response);
+ }
+
+ // ------------------------------------------------------------------------
+ // if we are not connected, connect to a backend server
+
+ if(unlikely(sock == -1)) {
+ usec_t start_ut = now_realtime_usec();
+ const char *s = destination;
+ while(*s) {
+ const char *e = s;
+
+ // skip separators, moving both s(tart) and e(nd)
+ while(isspace(*e) || *e == ',') s = ++e;
+
+ // move e(nd) to the first separator
+ while(*e && !isspace(*e) && *e != ',') e++;
+
+ // is there anything?
+ if(!*s || s == e) break;
+
+ char buf[e - s + 1];
+ strncpyz(buf, s, e - s);
+ chart_backend_reconnects++;
+ sock = connect_to(buf, default_port, &timeout);
+ if(sock != -1) break;
+ s = e;
+ }
+ chart_backend_latency += now_realtime_usec() - start_ut;
+ }
+
+ if(unlikely(netdata_exit)) break;
+
+ // ------------------------------------------------------------------------
+ // if we are connected, send our buffer to the backend server
+
+ if(likely(sock != -1)) {
+ size_t len = buffer_strlen(b);
+ usec_t start_ut = now_realtime_usec();
+ int flags = 0;
+#ifdef MSG_NOSIGNAL
+ flags += MSG_NOSIGNAL;
+#endif
+
+ ssize_t written = send(sock, buffer_tostring(b), len, flags);
+ chart_backend_latency += now_realtime_usec() - start_ut;
+ if(written != -1 && (size_t)written == len) {
+ // we sent the data successfully
+ chart_transmission_successes++;
+ chart_sent_bytes += written;
+ chart_sent_metrics = chart_buffered_metrics;
+
+ // reset the failures count
+ failures = 0;
+
+ // empty the buffer
+ buffer_flush(b);
+ }
+ else {
+ // oops! we couldn't send (all or some of the) data
+ error("Failed to write data to database backend '%s'. Willing to write %zu bytes, wrote %zd bytes. Will re-connect.", destination, len, written);
+ chart_transmission_failures++;
+
+ if(written != -1)
+ chart_sent_bytes += written;
+
+ // increment the counter we check for data loss
+ failures++;
+
+ // close the socket - we will re-open it next time
+ close(sock);
+ sock = -1;
+ }
+
+ // either the buffer is empty
+ // or is holding the data we couldn't send
+ // so, make sure the next iteration will continue
+ // from where we are now
+ after = before;
+ }
+ else {
+ error("Failed to update database backend '%s'", destination);
+ chart_transmission_failures++;
+
+ // increment the counter we check for data loss
+ failures++;
+ }
+
+ if(failures > buffer_on_failures) {
+ // too bad! we are going to lose data
+ chart_lost_bytes += buffer_strlen(b);
+ error("Reached %d backend failures. Flushing buffers to protect this host - this results in data loss on back-end server '%s'", failures, destination);
+ buffer_flush(b);
+ failures = 0;
+ chart_data_lost_events++;
+ chart_lost_metrics = chart_buffered_metrics;
+ }
+
+ if(unlikely(netdata_exit)) break;
+
+ // ------------------------------------------------------------------------
+ // update the monitoring charts
+
+ if(chart_ops->counter_done) rrdset_next(chart_ops);
+ rrddim_set(chart_ops, "read", chart_receptions);
+ rrddim_set(chart_ops, "write", chart_transmission_successes);
+ rrddim_set(chart_ops, "discard", chart_data_lost_events);
+ rrddim_set(chart_ops, "failure", chart_transmission_failures);
+ rrddim_set(chart_ops, "reconnect", chart_backend_reconnects);
+ rrdset_done(chart_ops);
+
+ if(chart_metrics->counter_done) rrdset_next(chart_metrics);
+ rrddim_set(chart_metrics, "buffered", chart_buffered_metrics);
+ rrddim_set(chart_metrics, "lost", chart_lost_metrics);
+ rrddim_set(chart_metrics, "sent", chart_sent_metrics);
+ rrdset_done(chart_metrics);
+
+ if(chart_bytes->counter_done) rrdset_next(chart_bytes);
+ rrddim_set(chart_bytes, "buffered", chart_buffered_bytes);
+ rrddim_set(chart_bytes, "lost", chart_lost_bytes);
+ rrddim_set(chart_bytes, "sent", chart_sent_bytes);
+ rrddim_set(chart_bytes, "received", chart_received_bytes);
+ rrdset_done(chart_bytes);
+
+ /*
+ if(chart_latency->counter_done) rrdset_next(chart_latency);
+ rrddim_set(chart_latency, "latency", chart_backend_latency);
+ rrdset_done(chart_latency);
+ */
+
+ getrusage(RUSAGE_THREAD, &thread);
+ if(chart_rusage->counter_done) rrdset_next(chart_rusage);
+ rrddim_set(chart_rusage, "user", thread.ru_utime.tv_sec * 1000000ULL + thread.ru_utime.tv_usec);
+ rrddim_set(chart_rusage, "system", thread.ru_stime.tv_sec * 1000000ULL + thread.ru_stime.tv_usec);
+ rrdset_done(chart_rusage);
+
+ if(likely(buffer_strlen(b) == 0))
+ chart_buffered_metrics = 0;
+
+ if(unlikely(netdata_exit)) break;
+ }
+
+cleanup:
+ if(sock != -1)
+ close(sock);
+
+ buffer_free(b);
+ buffer_free(response);
+
+ info("BACKEND thread exiting");
+
+ static_thread->enabled = 0;
+ pthread_exit(NULL);
+ return NULL;
+}