src/backends.c

   1 #include "common.h"
   2
   3 #define BACKEND_SOURCE_DATA_AS_COLLECTED 0x00000001
   4 #define BACKEND_SOURCE_DATA_AVERAGE      0x00000002
   5 #define BACKEND_SOURCE_DATA_SUM          0x00000004
   6
   7 static inline calculated_number backend_calculate_value_from_stored_data(RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
   8     time_t first_t = rrdset_first_entry_t(st);
   9     time_t last_t = rrdset_last_entry_t(st);
  10
  11     if(unlikely(before < first_t || after > last_t))
  12         // the chart has not been updated in the wanted timeframe
  13         return NAN;
  14
  15     // align the time-frame
  16     // for 'after' also skip the first value by adding st->update_every
  17     after  = after  - after  % st->update_every + st->update_every;
  18     before = before - before % st->update_every;
  19
  20     if(unlikely(after < first_t))
  21         after = first_t;
  22
  23     if(unlikely(after > before))
  24         // this can happen when the st->update_every > before - after
  25         before = after;
  26
  27     if(unlikely(before > last_t))
  28         before = last_t;
  29
  30     size_t counter = 0;
  31     calculated_number sum = 0;
  32
  33     long    start_at_slot = rrdset_time2slot(st, before),
  34             stop_at_slot  = rrdset_time2slot(st, after),
  35             slot, stop_now = 0;
  36
  37     for(slot = start_at_slot; !stop_now ; slot--) {
  38         if(unlikely(slot < 0)) slot = st->entries - 1;
  39         if(unlikely(slot == stop_at_slot)) stop_now = 1;
  40
  41         storage_number n = rd->values[slot];
  42         if(unlikely(!does_storage_number_exist(n))) continue;
  43
  44         calculated_number value = unpack_storage_number(n);
  45         sum += value;
  46         counter++;
  47     }
  48
  49     if(unlikely(!counter))
  50         return NAN;
  51
  52     if(unlikely(options & BACKEND_SOURCE_DATA_SUM))
  53         return sum;
  54
  55     return sum / (calculated_number)counter;
  56 }
  57
  58 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) {
  59     (void)host;
  60     (void)after;
  61     (void)before;
  62     (void)options;
  63     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);
  64     return 1;
  65 }
  66
  67 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) {
  68     (void)host;
  69     calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
  70     if(!isnan(value)) {
  71         buffer_sprintf(b, "%s.%s.%s.%s " CALCULATED_NUMBER_FORMAT " %u\n", prefix, hostname, st->id, rd->id, value, (uint32_t) before);
  72         return 1;
  73     }
  74     return 0;
  75 }
  76
  77 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) {
  78     (void)host;
  79     (void)after;
  80     (void)before;
  81     (void)options;
  82     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);
  83     return 1;
  84 }
  85
  86 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) {
  87     (void)host;
  88     calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
  89     if(!isnan(value)) {
  90         buffer_sprintf(b, "put %s.%s.%s %u " CALCULATED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t) before, value, hostname);
  91         return 1;
  92     }
  93     return 0;
  94 }
  95
  96 static inline int format_dimension_collected_json_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
  97     (void)host;
  98     (void)after;
  99     (void)before;
 100     (void)options;
 101     buffer_sprintf(b, "{"
 102         "\"prefix\":\"%s\","
 103         "\"hostname\":\"%s\","
 104         "\"id\":\"%s\","
 105         "\"subid\":\"%s\","
 106         "\"value\":" COLLECTED_NUMBER_FORMAT ","
 107         "\"timestamp\": %u}\n", prefix, hostname, st->id, rd->id, rd->last_collected_value, (uint32_t)rd->last_collected_time.tv_sec);
 108     return 1;
 109 }
 110
 111 static inline int format_dimension_stored_json_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
 112     (void)host;
 113     calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
 114     if(!isnan(value)) {
 115         buffer_sprintf(b, "{"
 116             "\"prefix\":\"%s\","
 117             "\"hostname\":\"%s\","
 118             "\"id\":\"%s\","
 119             "\"subid\":\"%s\","
 120             "\"value\":" CALCULATED_NUMBER_FORMAT ","
 121             "\"timestamp\": %u}\n", prefix, hostname, st->id, rd->id, value, (uint32_t) before);
 122         return 1;
 123     }
 124     return 0;
 125 }
 126
 127 static inline int process_graphite_response(BUFFER *b) {
 128     char sample[1024];
 129     const char *s = buffer_tostring(b);
 130     char *d = sample, *e = &sample[sizeof(sample) - 1];
 131
 132     for(; *s && d < e ;s++) {
 133         char c = *s;
 134         if(unlikely(!isprint(c))) c = ' ';
 135         *d++ = c;
 136     }
 137     *d = '\0';
 138
 139     info("Received %zu bytes from graphite backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
 140     buffer_flush(b);
 141     return 0;
 142 }
 143
 144 static inline int process_json_response(BUFFER *b) {
 145     char sample[1024];
 146     const char *s = buffer_tostring(b);
 147     char *d = sample, *e = &sample[sizeof(sample) - 1];
 148
 149     for(; *s && d < e ;s++) {
 150         char c = *s;
 151         if(unlikely(!isprint(c))) c = ' ';
 152         *d++ = c;
 153     }
 154     *d = '\0';
 155
 156     info("Received %zu bytes from json backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
 157     buffer_flush(b);
 158     return 0;
 159 }
 160
 161 static inline int process_opentsdb_response(BUFFER *b) {
 162     char sample[1024];
 163     const char *s = buffer_tostring(b);
 164     char *d = sample, *e = &sample[sizeof(sample) - 1];
 165
 166     for(; *s && d < e ;s++) {
 167         char c = *s;
 168         if(unlikely(!isprint(c))) c = ' ';
 169         *d++ = c;
 170     }
 171     *d = '\0';
 172
 173     info("Received %zu bytes from opentsdb backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
 174     buffer_flush(b);
 175     return 0;
 176 }
 177
 178 void *backends_main(void *ptr) {
 179     struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
 180
 181     BUFFER *b = buffer_create(1), *response = buffer_create(1);
 182     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;
 183     int (*backend_response_checker)(BUFFER *b) = NULL;
 184
 185     info("BACKEND thread created with task id %d", gettid());
 186
 187     if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 188         error("Cannot set pthread cancel type to DEFERRED.");
 189
 190     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 191         error("Cannot set pthread cancel state to ENABLE.");
 192
 193     // ------------------------------------------------------------------------
 194     // collect configuration options
 195
 196     struct timeval timeout = {
 197             .tv_sec = 0,
 198             .tv_usec = 0
 199     };
 200     int default_port = 0;
 201     int sock = -1;
 202     uint32_t options;
 203     int enabled = config_get_boolean("backend", "enabled", 0);
 204     const char *source = config_get("backend", "data source", "average");
 205     const char *type = config_get("backend", "type", "graphite");
 206     const char *destination = config_get("backend", "destination", "localhost");
 207     const char *prefix = config_get("backend", "prefix", "netdata");
 208     const char *hostname = config_get("backend", "hostname", localhost.hostname);
 209     int frequency = (int)config_get_number("backend", "update every", 10);
 210     int buffer_on_failures = (int)config_get_number("backend", "buffer on failures", 10);
 211     long timeoutms = config_get_number("backend", "timeout ms", frequency * 2 * 1000);
 212
 213     // ------------------------------------------------------------------------
 214     // validate configuration options
 215     // and prepare for sending data to our backend
 216     if(!enabled || frequency < 1)
 217         goto cleanup;
 218
 219     if(!strcmp(source, "as collected")) {
 220         options = BACKEND_SOURCE_DATA_AS_COLLECTED;
 221     }
 222     else if(!strcmp(source, "average")) {
 223         options = BACKEND_SOURCE_DATA_AVERAGE;
 224     }
 225     else if(!strcmp(source, "sum") || !strcmp(source, "volume")) {
 226         options = BACKEND_SOURCE_DATA_SUM;
 227     }
 228     else {
 229         error("Invalid data source method '%s' for backend given. Disabling backed.", source);
 230         goto cleanup;
 231     }
 232
 233     if(!strcmp(type, "graphite") || !strcmp(type, "graphite:plaintext")) {
 234         default_port = 2003;
 235         if(options == BACKEND_SOURCE_DATA_AS_COLLECTED)
 236             backend_request_formatter = format_dimension_collected_graphite_plaintext;
 237         else
 238             backend_request_formatter = format_dimension_stored_graphite_plaintext;
 239
 240         backend_response_checker = process_graphite_response;
 241     }
 242     else if(!strcmp(type, "opentsdb") || !strcmp(type, "opentsdb:telnet")) {
 243         default_port = 4242;
 244         if(options == BACKEND_SOURCE_DATA_AS_COLLECTED)
 245             backend_request_formatter = format_dimension_collected_opentsdb_telnet;
 246         else
 247             backend_request_formatter = format_dimension_stored_opentsdb_telnet;
 248
 249         backend_response_checker = process_opentsdb_response;
 250     }
 251     else if (!strcmp(type, "json") || !strcmp(type, "json:plaintext"))
 252     {
 253         default_port = 5448;
 254
 255         if (options == BACKEND_SOURCE_DATA_AS_COLLECTED)
 256         {
 257             backend_request_formatter = format_dimension_collected_json_plaintext;
 258         }
 259         else
 260         {
 261             backend_request_formatter = format_dimension_stored_json_plaintext;
 262         }
 263
 264         backend_response_checker = process_json_response;
 265     }
 266     else {
 267         error("Unknown backend type '%s'", type);
 268         goto cleanup;
 269     }
 270
 271     if(backend_request_formatter == NULL || backend_response_checker == NULL) {
 272         error("backend is misconfigured - disabling it.");
 273         goto cleanup;
 274     }
 275
 276     if(timeoutms < 1) {
 277         error("BACKED invalid timeout %ld ms given. Assuming %d ms.", timeoutms, frequency * 2 * 1000);
 278         timeoutms = frequency * 2 * 1000;
 279     }
 280     timeout.tv_sec  = (timeoutms * 1000) / 1000000;
 281     timeout.tv_usec = (timeoutms * 1000) % 1000000;
 282
 283     // ------------------------------------------------------------------------
 284     // prepare the charts for monitoring the backend
 285
 286     struct rusage thread;
 287
 288     collected_number
 289             chart_buffered_metrics = 0,
 290             chart_lost_metrics = 0,
 291             chart_sent_metrics = 0,
 292             chart_buffered_bytes = 0,
 293             chart_received_bytes = 0,
 294             chart_sent_bytes = 0,
 295             chart_receptions = 0,
 296             chart_transmission_successes = 0,
 297             chart_transmission_failures = 0,
 298             chart_data_lost_events = 0,
 299             chart_lost_bytes = 0,
 300             chart_backend_reconnects = 0,
 301             chart_backend_latency = 0;
 302
 303     RRDSET *chart_metrics = rrdset_find("netdata.backend_metrics");
 304     if(!chart_metrics) {
 305         chart_metrics = rrdset_create("netdata", "backend_metrics", NULL, "backend", NULL, "Netdata Buffered Metrics", "metrics", 130600, frequency, RRDSET_TYPE_LINE);
 306         rrddim_add(chart_metrics, "buffered", NULL,  1, 1, RRDDIM_ABSOLUTE);
 307         rrddim_add(chart_metrics, "lost",     NULL,  1, 1, RRDDIM_ABSOLUTE);
 308         rrddim_add(chart_metrics, "sent",     NULL,  1, 1, RRDDIM_ABSOLUTE);
 309     }
 310
 311     RRDSET *chart_bytes = rrdset_find("netdata.backend_bytes");
 312     if(!chart_bytes) {
 313         chart_bytes = rrdset_create("netdata", "backend_bytes", NULL, "backend", NULL, "Netdata Backend Data Size", "KB", 130610, frequency, RRDSET_TYPE_AREA);
 314         rrddim_add(chart_bytes, "buffered", NULL, 1, 1024, RRDDIM_ABSOLUTE);
 315         rrddim_add(chart_bytes, "lost",     NULL, 1, 1024, RRDDIM_ABSOLUTE);
 316         rrddim_add(chart_bytes, "sent",     NULL, 1, 1024, RRDDIM_ABSOLUTE);
 317         rrddim_add(chart_bytes, "received", NULL, 1, 1024, RRDDIM_ABSOLUTE);
 318     }
 319
 320     RRDSET *chart_ops = rrdset_find("netdata.backend_ops");
 321     if(!chart_ops) {
 322         chart_ops = rrdset_create("netdata", "backend_ops", NULL, "backend", NULL, "Netdata Backend Operations", "operations", 130630, frequency, RRDSET_TYPE_LINE);
 323         rrddim_add(chart_ops, "write",     NULL, 1, 1, RRDDIM_ABSOLUTE);
 324         rrddim_add(chart_ops, "discard",   NULL, 1, 1, RRDDIM_ABSOLUTE);
 325         rrddim_add(chart_ops, "reconnect", NULL, 1, 1, RRDDIM_ABSOLUTE);
 326         rrddim_add(chart_ops, "failure",   NULL, 1, 1, RRDDIM_ABSOLUTE);
 327         rrddim_add(chart_ops, "read",      NULL, 1, 1, RRDDIM_ABSOLUTE);
 328     }
 329
 330     /*
 331      * this is misleading - we can only measure the time we need to send data
 332      * this time is not related to the time required for the data to travel to
 333      * the backend database and the time that server needed to process them
 334      *
 335      * issue #1432 and https://www.softlab.ntua.gr/facilities/documentation/unix/unix-socket-faq/unix-socket-faq-2.html
 336      *
 337     RRDSET *chart_latency = rrdset_find("netdata.backend_latency");
 338     if(!chart_latency) {
 339         chart_latency = rrdset_create("netdata", "backend_latency", NULL, "backend", NULL, "Netdata Backend Latency", "ms", 130620, frequency, RRDSET_TYPE_AREA);
 340         rrddim_add(chart_latency, "latency",   NULL,  1, 1000, RRDDIM_ABSOLUTE);
 341     }
 342     */
 343
 344     RRDSET *chart_rusage = rrdset_find("netdata.backend_thread_cpu");
 345     if(!chart_rusage) {
 346         chart_rusage = rrdset_create("netdata", "backend_thread_cpu", NULL, "backend", NULL, "NetData Backend Thread CPU usage", "milliseconds/s", 130630, frequency, RRDSET_TYPE_STACKED);
 347         rrddim_add(chart_rusage, "user",   NULL, 1, 1000, RRDDIM_INCREMENTAL);
 348         rrddim_add(chart_rusage, "system", NULL, 1, 1000, RRDDIM_INCREMENTAL);
 349     }
 350
 351     // ------------------------------------------------------------------------
 352     // prepare the backend main loop
 353
 354     info("BACKEND configured ('%s' on '%s' sending '%s' data, every %d seconds, as host '%s', with prefix '%s')", type, destination, source, frequency, hostname, prefix);
 355
 356     usec_t step_ut = frequency * USEC_PER_SEC;
 357     time_t after = now_realtime_sec();
 358     int failures = 0;
 359     heartbeat_t hb;
 360     heartbeat_init(&hb);
 361
 362     for(;;) {
 363         // ------------------------------------------------------------------------
 364         // Wait for the next iteration point.
 365         heartbeat_next(&hb, step_ut);
 366         time_t before = now_realtime_sec();
 367
 368         // ------------------------------------------------------------------------
 369         // add to the buffer the data we need to send to the backend
 370         RRDSET *st;
 371         int pthreadoldcancelstate;
 372
 373         if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
 374             error("Cannot set pthread cancel state to DISABLE.");
 375
 376         rrdhost_rdlock(&localhost);
 377         for(st = localhost.rrdset_root; st ;st = st->next) {
 378             pthread_rwlock_rdlock(&st->rwlock);
 379
 380             RRDDIM *rd;
 381             for(rd = st->dimensions; rd ;rd = rd->next) {
 382                 if(rd->last_collected_time.tv_sec >= after)
 383                     chart_buffered_metrics += backend_request_formatter(b, prefix, &localhost, hostname, st, rd, after, before, options);
 384             }
 385
 386             pthread_rwlock_unlock(&st->rwlock);
 387         }
 388         rrdhost_unlock(&localhost);
 389
 390         if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
 391             error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
 392
 393         // ------------------------------------------------------------------------
 394
 395         chart_buffered_bytes = (collected_number)buffer_strlen(b);
 396
 397         // reset the monitoring chart counters
 398         chart_received_bytes =
 399         chart_sent_bytes =
 400         chart_sent_metrics =
 401         chart_lost_metrics =
 402         chart_transmission_successes =
 403         chart_transmission_failures =
 404         chart_data_lost_events =
 405         chart_lost_bytes =
 406         chart_backend_reconnects =
 407         chart_backend_latency = 0;
 408
 409         if(unlikely(netdata_exit)) break;
 410
 411         //fprintf(stderr, "\nBACKEND BEGIN:\n%s\nBACKEND END\n", buffer_tostring(b)); // FIXME
 412         //fprintf(stderr, "after = %lu, before = %lu\n", after, before);
 413
 414         // prepare for the next iteration
 415         // to add incrementally data to buffer
 416         after = before;
 417
 418         // ------------------------------------------------------------------------
 419         // if we are connected, receive a response, without blocking
 420
 421         if(likely(sock != -1)) {
 422             errno = 0;
 423
 424             // loop through to collect all data
 425             while(sock != -1 && errno != EWOULDBLOCK) {
 426                 buffer_need_bytes(response, 4096);
 427
 428                 ssize_t r = recv(sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
 429                 if(likely(r > 0)) {
 430                     // we received some data
 431                     response->len += r;
 432                     chart_received_bytes += r;
 433                     chart_receptions++;
 434                 }
 435                 else if(r == 0) {
 436                     error("Backend '%s' closed the socket", destination);
 437                     close(sock);
 438                     sock = -1;
 439                 }
 440                 else {
 441                     // failed to receive data
 442                     if(errno != EAGAIN && errno != EWOULDBLOCK) {
 443                         error("Cannot receive data from backend '%s'.", destination);
 444                     }
 445                 }
 446             }
 447
 448             // if we received data, process them
 449             if(buffer_strlen(response))
 450                 backend_response_checker(response);
 451         }
 452
 453         // ------------------------------------------------------------------------
 454         // if we are not connected, connect to a backend server
 455
 456         if(unlikely(sock == -1)) {
 457             usec_t start_ut = now_monotonic_usec();
 458             const char *s = destination;
 459             while(*s) {
 460                 const char *e = s;
 461
 462                 // skip separators, moving both s(tart) and e(nd)
 463                 while(isspace(*e) || *e == ',') s = ++e;
 464
 465                 // move e(nd) to the first separator
 466                 while(*e && !isspace(*e) && *e != ',') e++;
 467
 468                 // is there anything?
 469                 if(!*s || s == e) break;
 470
 471                 char buf[e - s + 1];
 472                 strncpyz(buf, s, e - s);
 473                 chart_backend_reconnects++;
 474                 sock = connect_to(buf, default_port, &timeout);
 475                 if(sock != -1) break;
 476                 s = e;
 477             }
 478             chart_backend_latency += now_monotonic_usec() - start_ut;
 479         }
 480
 481         if(unlikely(netdata_exit)) break;
 482
 483         // ------------------------------------------------------------------------
 484         // if we are connected, send our buffer to the backend server
 485
 486         if(likely(sock != -1)) {
 487             size_t len = buffer_strlen(b);
 488             usec_t start_ut = now_monotonic_usec();
 489             int flags = 0;
 490 #ifdef MSG_NOSIGNAL
 491             flags += MSG_NOSIGNAL;
 492 #endif
 493
 494             ssize_t written = send(sock, buffer_tostring(b), len, flags);
 495             chart_backend_latency += now_monotonic_usec() - start_ut;
 496             if(written != -1 && (size_t)written == len) {
 497                 // we sent the data successfully
 498                 chart_transmission_successes++;
 499                 chart_sent_bytes += written;
 500                 chart_sent_metrics = chart_buffered_metrics;
 501
 502                 // reset the failures count
 503                 failures = 0;
 504
 505                 // empty the buffer
 506                 buffer_flush(b);
 507             }
 508             else {
 509                 // oops! we couldn't send (all or some of the) data
 510                 error("Failed to write data to database backend '%s'. Willing to write %zu bytes, wrote %zd bytes. Will re-connect.", destination, len, written);
 511                 chart_transmission_failures++;
 512
 513                 if(written != -1)
 514                     chart_sent_bytes += written;
 515
 516                 // increment the counter we check for data loss
 517                 failures++;
 518
 519                 // close the socket - we will re-open it next time
 520                 close(sock);
 521                 sock = -1;
 522             }
 523         }
 524         else {
 525             error("Failed to update database backend '%s'", destination);
 526             chart_transmission_failures++;
 527
 528             // increment the counter we check for data loss
 529             failures++;
 530         }
 531
 532         if(failures > buffer_on_failures) {
 533             // too bad! we are going to lose data
 534             chart_lost_bytes += buffer_strlen(b);
 535             error("Reached %d backend failures. Flushing buffers to protect this host - this results in data loss on back-end server '%s'", failures, destination);
 536             buffer_flush(b);
 537             failures = 0;
 538             chart_data_lost_events++;
 539             chart_lost_metrics = chart_buffered_metrics;
 540         }
 541
 542         if(unlikely(netdata_exit)) break;
 543
 544         // ------------------------------------------------------------------------
 545         // update the monitoring charts
 546
 547         if(chart_ops->counter_done) rrdset_next(chart_ops);
 548         rrddim_set(chart_ops, "read",         chart_receptions);
 549         rrddim_set(chart_ops, "write",        chart_transmission_successes);
 550         rrddim_set(chart_ops, "discard",      chart_data_lost_events);
 551         rrddim_set(chart_ops, "failure",      chart_transmission_failures);
 552         rrddim_set(chart_ops, "reconnect",    chart_backend_reconnects);
 553         rrdset_done(chart_ops);
 554
 555         if(chart_metrics->counter_done) rrdset_next(chart_metrics);
 556         rrddim_set(chart_metrics, "buffered", chart_buffered_metrics);
 557         rrddim_set(chart_metrics, "lost",     chart_lost_metrics);
 558         rrddim_set(chart_metrics, "sent",     chart_sent_metrics);
 559         rrdset_done(chart_metrics);
 560
 561         if(chart_bytes->counter_done) rrdset_next(chart_bytes);
 562         rrddim_set(chart_bytes, "buffered",   chart_buffered_bytes);
 563         rrddim_set(chart_bytes, "lost",       chart_lost_bytes);
 564         rrddim_set(chart_bytes, "sent",       chart_sent_bytes);
 565         rrddim_set(chart_bytes, "received",   chart_received_bytes);
 566         rrdset_done(chart_bytes);
 567
 568         /*
 569         if(chart_latency->counter_done) rrdset_next(chart_latency);
 570         rrddim_set(chart_latency, "latency",  chart_backend_latency);
 571         rrdset_done(chart_latency);
 572         */
 573
 574         getrusage(RUSAGE_THREAD, &thread);
 575         if(chart_rusage->counter_done) rrdset_next(chart_rusage);
 576         rrddim_set(chart_rusage, "user",   thread.ru_utime.tv_sec * 1000000ULL + thread.ru_utime.tv_usec);
 577         rrddim_set(chart_rusage, "system", thread.ru_stime.tv_sec * 1000000ULL + thread.ru_stime.tv_usec);
 578         rrdset_done(chart_rusage);
 579
 580         if(likely(buffer_strlen(b) == 0))
 581             chart_buffered_metrics = 0;
 582
 583         if(unlikely(netdata_exit)) break;
 584     }
 585
 586 cleanup:
 587     if(sock != -1)
 588         close(sock);
 589
 590     buffer_free(b);
 591     buffer_free(response);
 592
 593     info("BACKEND thread exiting");
 594
 595     static_thread->enabled = 0;
 596     pthread_exit(NULL);
 597     return NULL;
 598 }