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librdkafka/examples/rdkafka_performance.c

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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2012, Magnus Edenhill
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* Apache Kafka consumer & producer performance tester
* using the Kafka driver from librdkafka
* (https://github.com/edenhill/librdkafka)
*/
#include <ctype.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
/* Typical include path would be <librdkafka/rdkafka.h>, but this program
* is built from within the librdkafka source tree and thus differs. */
#include "rdkafka.h" /* for Kafka driver */
/* Do not include these defines from your program, they will not be
* provided by librdkafka. */
#include "rd.h"
#include "rdtime.h"
static int run = 1;
static int forever = 1;
static int dispintvl = 1000;
static int do_seq = 0;
static int exit_after = 0;
static int exit_eof = 0;
static FILE *stats_fp;
static int dr_disp_div;
static int verbosity = 1;
static void stop (int sig) {
if (!run)
exit(0);
run = 0;
}
static long int msgs_wait_cnt = 0;
static rd_ts_t t_end;
static rd_kafka_t *rk;
static struct {
rd_ts_t t_start;
rd_ts_t t_end;
rd_ts_t t_end_send;
uint64_t msgs;
uint64_t msgs_dr_ok;
uint64_t msgs_dr_err;
uint64_t bytes_dr_ok;
uint64_t bytes;
uint64_t tx;
uint64_t tx_err;
uint64_t avg_rtt;
uint64_t offset;
rd_ts_t t_latency;
rd_ts_t t_last;
rd_ts_t t_enobufs_last;
rd_ts_t t_total;
} cnt = {};
static void err_cb (rd_kafka_t *rk, int err, const char *reason, void *opaque) {
printf("%% ERROR CALLBACK: %s: %s: %s\n",
rd_kafka_name(rk), rd_kafka_err2str(err), reason);
}
static void msg_delivered (rd_kafka_t *rk,
void *payload, size_t len,
int error_code,
void *opaque, void *msg_opaque) {
static rd_ts_t last;
rd_ts_t now = rd_clock();
static int msgs;
msgs++;
msgs_wait_cnt--;
if (error_code)
cnt.msgs_dr_err++;
else {
cnt.msgs_dr_ok++;
cnt.bytes_dr_ok += len;
}
if ((error_code &&
(cnt.msgs_dr_err < 50 ||
!(cnt.msgs_dr_err % (dispintvl / 1000)))) ||
!last || msgs_wait_cnt < 5 ||
!(msgs_wait_cnt % dr_disp_div) ||
(now - last) >= dispintvl * 1000 ||
verbosity >= 3) {
if (error_code && verbosity >= 2)
printf("%% Message delivery failed: %s (%li remain)\n",
rd_kafka_err2str(error_code),
msgs_wait_cnt);
else if (verbosity >= 2)
printf("%% Message delivered: %li remain\n",
msgs_wait_cnt);
if (verbosity >= 3 && do_seq)
printf(" --> \"%.*s\"\n", (int)len, (char *)payload);
last = now;
}
if (msgs_wait_cnt == 0 && !forever) {
if (verbosity >= 2)
printf("All messages delivered!\n");
t_end = rd_clock();
run = 0;
}
if (exit_after && exit_after <= msgs) {
printf("%% Hard exit after %i messages, as requested\n",
exit_after);
exit(0);
}
}
static void msg_consume (rd_kafka_message_t *rkmessage, void *opaque) {
if (rkmessage->err) {
if (rkmessage->err == RD_KAFKA_RESP_ERR__PARTITION_EOF) {
cnt.offset = rkmessage->offset;
if (verbosity >= 1)
printf("%% Consumer reached end of "
"%s [%"PRId32"] "
"message queue at offset %"PRId64"\n",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition, rkmessage->offset);
if (exit_eof)
run = 0;
return;
}
printf("%% Consume error for topic \"%s\" [%"PRId32"] "
"offset %"PRId64": %s\n",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rkmessage->offset,
rd_kafka_message_errstr(rkmessage));
cnt.msgs_dr_err++;
return;
}
cnt.offset = rkmessage->offset;
cnt.msgs++;
cnt.bytes += rkmessage->len;
if (verbosity >= 2 && !(cnt.msgs % 1000000))
printf("@%"PRId64": %.*s\n",
rkmessage->offset,
(int)rkmessage->len, (char *)rkmessage->payload);
#if 0 /* Future API */
/* We store offset when we're done processing
* the current message. */
rd_kafka_offset_store(rkmessage->rkt, rkmessage->partition,
rd_kafka_offset_next(rkmessage));
#endif
}
/**
* Find and extract single value from a two-level search.
* First find 'field1', then find 'field2' and extract its value.
* Returns 0 on miss else the value.
*/
static uint64_t json_parse_fields (const char *json, const char **end,
const char *field1, const char *field2) {
const char *t = json;
const char *t2;
int len1 = strlen(field1);
int len2 = strlen(field2);
while ((t2 = strstr(t, field1))) {
uint64_t v;
t = t2;
t += len1;
/* Find field */
if (!(t2 = strstr(t, field2)))
continue;
t2 += len2;
while (isspace((int)*t2))
t2++;
v = strtoull(t2, (char **)&t, 10);
if (t2 == t)
continue;
*end = t;
return v;
}
*end = t + strlen(t);
return 0;
}
/**
* Parse various values from rdkafka stats
*/
static void json_parse_stats (const char *json) {
const char *t;
const int max_avgs = 100; /* max number of brokers to scan for rtt */
uint64_t avg_rtt[max_avgs+1];
int avg_rtt_i = 0;
/* Store totals at end of array */
avg_rtt[max_avgs] = 0;
/* Extract all broker RTTs */
t = json;
while (avg_rtt_i < max_avgs && *t) {
avg_rtt[avg_rtt_i] = json_parse_fields(t, &t,
"\"rtt\":",
"\"avg\":");
/* Skip low RTT values, means no messages are passing */
if (avg_rtt[avg_rtt_i] < 100 /*0.1ms*/)
continue;
avg_rtt[max_avgs] += avg_rtt[avg_rtt_i];
avg_rtt_i++;
}
if (avg_rtt_i > 0)
avg_rtt[max_avgs] /= avg_rtt_i;
cnt.avg_rtt = avg_rtt[max_avgs];
}
static int stats_cb (rd_kafka_t *rk, char *json, size_t json_len,
void *opaque) {
/* Extract values for our own stats */
json_parse_stats(json);
if (stats_fp)
fprintf(stats_fp, "%s\n", json);
return 0;
}
#define _OTYPE_TAB 0x1 /* tabular format */
#define _OTYPE_SUMMARY 0x2 /* summary format */
#define _OTYPE_FORCE 0x4 /* force output regardless of interval timing */
static void print_stats (int mode, int otype, const char *compression) {
rd_ts_t now = rd_clock();
rd_ts_t t_total;
static int rows_written = 0;
if (!(otype & _OTYPE_FORCE) &&
(verbosity == 0 ||
cnt.t_last + dispintvl > now))
return;
if (cnt.t_end_send)
t_total = cnt.t_end_send - cnt.t_start;
else if (cnt.t_end)
t_total = cnt.t_end - cnt.t_start;
else
t_total = now - cnt.t_start;
if (mode == 'P') {
if (otype & _OTYPE_TAB) {
#define ROW_START() do {} while (0)
#define COL_HDR(NAME) printf("| %10.10s ", (NAME))
#define COL_PR64(NAME,VAL) printf("| %10"PRIu64" ", (VAL))
#define COL_PRF(NAME,VAL) printf("| %10.2f ", (VAL))
#define ROW_END() do { \
printf("\n"); \
rows_written++; \
} while (0)
if (!(rows_written % 20)) {
/* First time, print header */
ROW_START();
COL_HDR("elapsed");
COL_HDR("msgs");
COL_HDR("bytes");
COL_HDR("rtt");
COL_HDR("dr");
COL_HDR("dr_m/s");
COL_HDR("dr_MB/s");
COL_HDR("dr_err");
COL_HDR("tx_err");
COL_HDR("outq");
ROW_END();
}
ROW_START();
COL_PR64("elapsed", t_total / 1000);
COL_PR64("msgs", cnt.msgs);
COL_PR64("bytes", cnt.bytes);
COL_PR64("rtt", cnt.avg_rtt / 1000);
COL_PR64("dr", cnt.msgs_dr_ok);
COL_PR64("dr_m/s",
((cnt.msgs_dr_ok * 1000000) / t_total));
COL_PRF("dr_MB/s",
(float)((cnt.bytes_dr_ok) / (float)t_total));
COL_PR64("dr_err", cnt.msgs_dr_err);
COL_PR64("tx_err", cnt.tx_err);
COL_PR64("outq", (uint64_t)rd_kafka_outq_len(rk));
ROW_END();
}
if (otype & _OTYPE_SUMMARY) {
printf("%% %"PRIu64" messages produced "
"(%"PRIu64" bytes), "
"%"PRIu64" delivered (%"PRIu64" failed) "
"in %"PRIu64"ms: %"PRIu64" msgs/s and "
"%.02f Mb/s, "
"%"PRIu64" produce failures, %i in queue, "
"%s compression\n",
cnt.msgs, cnt.bytes,
cnt.msgs_dr_ok, cnt.msgs_dr_err,
t_total / 1000,
((cnt.msgs_dr_ok * 1000000) / t_total),
(float)((cnt.bytes_dr_ok) / (float)t_total),
cnt.tx_err, rd_kafka_outq_len(rk), compression);
}
} else {
if (otype & _OTYPE_TAB) {
if (!(rows_written % 20)) {
/* First time, print header */
ROW_START();
COL_HDR("elapsed");
COL_HDR("msgs");
COL_HDR("bytes");
COL_HDR("rtt");
COL_HDR("m/s");
COL_HDR("MB/s");
COL_HDR("rx_err");
COL_HDR("offset");
ROW_END();
}
ROW_START();
COL_PR64("elapsed", t_total / 1000);
COL_PR64("msgs", cnt.msgs);
COL_PR64("bytes", cnt.bytes);
COL_PR64("rtt", cnt.avg_rtt / 1000);
COL_PR64("m/s",
((cnt.msgs * 1000000) / t_total));
COL_PRF("MB/s",
(float)((cnt.bytes) / (float)t_total));
COL_PR64("rx_err", cnt.msgs_dr_err);
COL_PR64("offset", cnt.offset);
ROW_END();
}
if (otype & _OTYPE_SUMMARY) {
printf("%% %"PRIu64" messages and %"PRIu64" bytes "
"%s in %"PRIu64"ms: %"PRIu64" msgs/s and "
"%.02f Mb/s, "
"%s compression\n",
cnt.msgs, cnt.bytes,
mode == 'P' ? "produced" : "consumed",
t_total / 1000,
((cnt.msgs * 1000000) / t_total),
(float)((cnt.bytes) / (float)t_total),
compression);
}
}
cnt.t_last = now;
}
static void sig_usr1 (int sig) {
rd_kafka_dump(stdout, rk);
}
int main (int argc, char **argv) {
char *brokers = "localhost";
char mode = 'C';
char *topic = NULL;
const char *key = NULL;
int partition = RD_KAFKA_PARTITION_UA; /* random */
int opt;
int msgcnt = -1;
int sendflags = 0;
char *msgpattern = "librdkafka_performance testing!";
int msgsize = strlen(msgpattern);
const char *debug = NULL;
rd_ts_t now;
char errstr[512];
uint64_t seq = 0;
int seed = time(NULL);
rd_kafka_topic_t *rkt;
rd_kafka_conf_t *conf;
rd_kafka_topic_conf_t *topic_conf;
const char *compression = "no";
int64_t start_offset = 0;
int batch_size = 0;
int idle = 0;
const char *stats_cmd = NULL;
char *stats_intvlstr = NULL;
char tmp[128];
char *tmp2;
int otype = _OTYPE_SUMMARY;
double dtmp;
int rate_sleep = 0;
/* Kafka configuration */
conf = rd_kafka_conf_new();
rd_kafka_conf_set_error_cb(conf, err_cb);
rd_kafka_conf_set_dr_cb(conf, msg_delivered);
/* Producer config */
rd_kafka_conf_set(conf, "queue.buffering.max.messages", "500000",
NULL, 0);
rd_kafka_conf_set(conf, "message.send.max.retries", "3", NULL, 0);
rd_kafka_conf_set(conf, "retry.backoff.ms", "500", NULL, 0);
/* Consumer config */
/* Tell rdkafka to (try to) maintain 1M messages
* in its internal receive buffers. This is to avoid
* application -> rdkafka -> broker per-message ping-pong
* latency.
* The larger the local queue, the higher the performance.
* Try other values with: ... -X queued.min.messages=1000
*/
rd_kafka_conf_set(conf, "queued.min.messages", "1000000", NULL, 0);
/* Kafka topic configuration */
topic_conf = rd_kafka_topic_conf_new();
while ((opt =
getopt(argc, argv,
"PCt:p:b:s:k:c:fi:Dd:m:S:x:"
"R:a:z:o:X:B:eT:G:qvIur:")) != -1) {
switch (opt) {
case 'P':
case 'C':
mode = opt;
break;
case 't':
topic = optarg;
break;
case 'p':
partition = atoi(optarg);
break;
case 'b':
brokers = optarg;
break;
case 's':
msgsize = atoi(optarg);
break;
case 'k':
key = optarg;
break;
case 'c':
msgcnt = atoi(optarg);
break;
case 'D':
sendflags |= RD_KAFKA_MSG_F_FREE;
break;
case 'i':
dispintvl = atoi(optarg);
break;
case 'm':
msgpattern = optarg;
break;
case 'S':
seq = strtoull(optarg, NULL, 10);
do_seq = 1;
break;
case 'x':
exit_after = atoi(optarg);
break;
case 'R':
seed = atoi(optarg);
break;
case 'a':
if (rd_kafka_topic_conf_set(topic_conf,
"request.required.acks",
optarg,
errstr, sizeof(errstr)) !=
RD_KAFKA_CONF_OK) {
fprintf(stderr, "%% %s\n", errstr);
exit(1);
}
break;
case 'B':
batch_size = atoi(optarg);
break;
case 'z':
if (rd_kafka_conf_set(conf, "compression.codec",
optarg,
errstr, sizeof(errstr)) !=
RD_KAFKA_CONF_OK) {
fprintf(stderr, "%% %s\n", errstr);
exit(1);
}
compression = optarg;
break;
case 'o':
if (!strcmp(optarg, "end"))
start_offset = RD_KAFKA_OFFSET_END;
else if (!strcmp(optarg, "beginning"))
start_offset = RD_KAFKA_OFFSET_BEGINNING;
else if (!strcmp(optarg, "stored"))
start_offset = RD_KAFKA_OFFSET_STORED;
else {
start_offset = strtoll(optarg, NULL, 10);
if (start_offset < 0)
start_offset = RD_KAFKA_OFFSET_TAIL(-start_offset);
}
break;
case 'e':
exit_eof = 1;
break;
case 'd':
debug = optarg;
break;
case 'X':
{
char *name, *val;
rd_kafka_conf_res_t res;
if (!strcmp(optarg, "list") ||
!strcmp(optarg, "help")) {
rd_kafka_conf_properties_show(stdout);
exit(0);
}
name = optarg;
if (!(val = strchr(name, '='))) {
fprintf(stderr, "%% Expected "
"-X property=value, not %s\n", name);
exit(1);
}
*val = '\0';
val++;
res = RD_KAFKA_CONF_UNKNOWN;
/* Try "topic." prefixed properties on topic
* conf first, and then fall through to global if
* it didnt match a topic configuration property. */
if (!strncmp(name, "topic.", strlen("topic.")))
res = rd_kafka_topic_conf_set(topic_conf,
name+
strlen("topic."),
val,
errstr,
sizeof(errstr));
if (res == RD_KAFKA_CONF_UNKNOWN)
res = rd_kafka_conf_set(conf, name, val,
errstr, sizeof(errstr));
if (res != RD_KAFKA_CONF_OK) {
fprintf(stderr, "%% %s\n", errstr);
exit(1);
}
}
break;
case 'T':
stats_intvlstr = optarg;
break;
case 'G':
stats_cmd = optarg;
break;
case 'q':
verbosity--;
break;
case 'v':
verbosity++;
break;
case 'I':
idle = 1;
break;
case 'u':
otype = _OTYPE_TAB;
break;
case 'r':
dtmp = strtod(optarg, &tmp2);
if (tmp2 == optarg ||
(dtmp >= -0.001 && dtmp <= 0.001)) {
fprintf(stderr, "%% Invalid rate: %s\n",
optarg);
exit(1);
}
rate_sleep = (int)(1000000.0 / dtmp);
break;
default:
goto usage;
}
}
if (!topic || optind != argc) {
usage:
fprintf(stderr,
"Usage: %s [-C|-P] -t <topic> "
"[-p <partition>] [-b <broker,broker..>] [options..]\n"
"\n"
"librdkafka version %s (0x%08x)\n"
"\n"
" Options:\n"
" -C | -P Consumer or Producer mode\n"
" -t <topic> Topic to fetch / produce\n"
" -p <num> Partition (defaults to random)\n"
" -b <brokers> Broker address list (host[:port],..)\n"
" -s <size> Message size (producer)\n"
" -k <key> Message key (producer)\n"
" -c <cnt> Messages to transmit/receive\n"
" -D Copy/Duplicate data buffer (producer)\n"
" -i <ms> Display interval\n"
" -m <msg> Message payload pattern\n"
" -S <start> Send a sequence number starting at "
"<start> as payload\n"
" -R <seed> Random seed value (defaults to time)\n"
" -a <acks> Required acks (producer): "
"-1, 0, 1, >1\n"
" -B <size> Consume batch size (# of msgs)\n"
" -z <codec> Enable compression:\n"
" none|gzip|snappy\n"
" -o <offset> Start offset (consumer)\n"
" beginning, end, NNNNN or -NNNNN\n"
" -d [facs..] Enable debugging contexts:\n"
" %s\n"
" -X <prop=name> Set arbitrary librdkafka "
"configuration property\n"
" Properties prefixed with \"topic.\" "
"will be set on topic object.\n"
" Use '-X list' to see the full list\n"
" of supported properties.\n"
" -T <intvl> Enable statistics from librdkafka at "
"specified interval (ms)\n"
" -G <command> Pipe statistics to <command>\n"
" -I Idle: dont produce any messages\n"
" -q Decrease verbosity\n"
" -v Increase verbosity (default 1)\n"
" -u Output stats in table format\n"
" -r <rate> Producer msg/s limit\n"
"\n"
" In Consumer mode:\n"
" consumes messages and prints thruput\n"
" If -B <..> is supplied the batch consumer\n"
" mode is used, else the callback mode is used.\n"
"\n"
" In Producer mode:\n"
" writes messages of size -s <..> and prints thruput\n"
"\n",
argv[0],
rd_kafka_version_str(), rd_kafka_version(),
RD_KAFKA_DEBUG_CONTEXTS);
exit(1);
}
dispintvl *= 1000; /* us */
printf("%% Using random seed %i, verbosity level %i\n",
seed, verbosity);
srand(seed);
signal(SIGINT, stop);
signal(SIGUSR1, sig_usr1);
if (debug &&
rd_kafka_conf_set(conf, "debug", debug, errstr, sizeof(errstr)) !=
RD_KAFKA_CONF_OK) {
printf("%% Debug configuration failed: %s: %s\n",
errstr, debug);
exit(1);
}
/* Always enable stats (for RTT extraction), and if user supplied
* the -T <intvl> option we let her take part of the stats aswell. */
rd_kafka_conf_set_stats_cb(conf, stats_cb);
if (!stats_intvlstr) {
/* if no user-desired stats, adjust stats interval
* to the display interval. */
snprintf(tmp, sizeof(tmp), "%i", dispintvl / 1000);
}
if (rd_kafka_conf_set(conf, "statistics.interval.ms",
stats_intvlstr ? : tmp,
errstr, sizeof(errstr)) !=
RD_KAFKA_CONF_OK) {
fprintf(stderr, "%% %s\n", errstr);
exit(1);
}
if (stats_intvlstr) {
/* User enabled stats (-T) */
if (stats_cmd) {
if (!(stats_fp = popen(stats_cmd, "we"))) {
fprintf(stderr,
"%% Failed to start stats command: "
"%s: %s", stats_cmd, strerror(errno));
exit(1);
}
} else
stats_fp = stdout;
}
if (msgcnt != -1)
forever = 0;
if (mode == 'P') {
/*
* Producer
*/
char *sbuf;
char *pbuf;
int outq;
int keylen = key ? strlen(key) : 0;
off_t rof = 0;
size_t plen = strlen(msgpattern);
if (do_seq) {
if (msgsize < strlen("18446744073709551615: ")+1)
msgsize = strlen("18446744073709551615: ")+1;
/* Force duplication of payload */
sendflags |= RD_KAFKA_MSG_F_FREE;
}
sbuf = malloc(msgsize);
/* Copy payload content to new buffer */
while (rof < msgsize) {
size_t xlen = RD_MIN(msgsize-rof, plen);
memcpy(sbuf+rof, msgpattern, xlen);
rof += xlen;
}
if (msgcnt == -1)
printf("%% Sending messages of size %i bytes\n",
msgsize);
else
printf("%% Sending %i messages of size %i bytes\n",
msgcnt, msgsize);
/* Create Kafka handle */
if (!(rk = rd_kafka_new(RD_KAFKA_PRODUCER, conf,
errstr, sizeof(errstr)))) {
fprintf(stderr,
"%% Failed to create Kafka producer: %s\n",
errstr);
exit(1);
}
if (debug)
rd_kafka_set_log_level(rk, 7);
/* Add broker(s) */
if (rd_kafka_brokers_add(rk, brokers) < 1) {
fprintf(stderr, "%% No valid brokers specified\n");
exit(1);
}
/* Explicitly create topic to avoid per-msg lookups. */
rkt = rd_kafka_topic_new(rk, topic, topic_conf);
if (rate_sleep && verbosity >= 2)
fprintf(stderr,
"%% Inter message rate limiter sleep %ius\n",
rate_sleep);
dr_disp_div = msgcnt / 50;
if (dr_disp_div == 0)
dr_disp_div = 10;
cnt.t_start = rd_clock();
while (run && (msgcnt == -1 || cnt.msgs < msgcnt)) {
/* Send/Produce message. */
if (idle) {
rd_kafka_poll(rk, 1000);
continue;
}
if (do_seq) {
snprintf(sbuf, msgsize-1, "%"PRIu64": ", seq);
seq++;
}
if (sendflags & RD_KAFKA_MSG_F_FREE) {
/* Duplicate memory */
pbuf = malloc(msgsize);
memcpy(pbuf, sbuf, msgsize);
} else
pbuf = sbuf;
cnt.tx++;
while (run &&
rd_kafka_produce(rkt, partition,
sendflags, pbuf, msgsize,
key, keylen, NULL) == -1) {
if (errno == ESRCH)
printf("%% No such partition: "
"%"PRId32"\n", partition);
else if ((errno != ENOBUFS && verbosity >= 1) ||
verbosity >= 3)
printf("%% produce error: %s%s\n",
rd_kafka_err2str(
rd_kafka_errno2err(
errno)),
errno == ENOBUFS ?
" (backpressure)":"");
cnt.tx_err++;
if (errno != ENOBUFS) {
run = 0;
break;
}
now = rd_clock();
if (verbosity >= 2 &&
cnt.t_enobufs_last + dispintvl <= now) {
printf("%% Backpressure %i "
"(tx %"PRIu64", "
"txerr %"PRIu64")\n",
rd_kafka_outq_len(rk),
cnt.tx, cnt.tx_err);
cnt.t_enobufs_last = now;
}
/* Poll to handle delivery reports */
rd_kafka_poll(rk, 10);
print_stats(mode, otype, compression);
}
msgs_wait_cnt++;
cnt.msgs++;
cnt.bytes += msgsize;
if (rate_sleep)
usleep(rate_sleep);
/* Must poll to handle delivery reports */
rd_kafka_poll(rk, 0);
print_stats(mode, otype, compression);
}
forever = 0;
if (verbosity >= 2)
printf("%% All messages produced, "
"now waiting for %li deliveries\n",
msgs_wait_cnt);
if (debug)
rd_kafka_dump(stdout, rk);
/* Wait for messages to be delivered */
while (run && rd_kafka_poll(rk, 1000) != -1)
print_stats(mode, otype, compression);
outq = rd_kafka_outq_len(rk);
if (verbosity >= 2)
printf("%% %i messages in outq\n", outq);
cnt.msgs -= outq;
cnt.bytes -= msgsize * outq;
cnt.t_end = t_end;
if (cnt.tx_err > 0)
printf("%% %"PRIu64" backpressures for %"PRIu64
" produce calls: %.3f%% backpressure rate\n",
cnt.tx_err, cnt.tx,
((double)cnt.tx_err / (double)cnt.tx) * 100.0);
if (debug)
rd_kafka_dump(stdout, rk);
/* Destroy topic */
rd_kafka_topic_destroy(rkt);
/* Destroy the handle */
rd_kafka_destroy(rk);
} else if (mode == 'C') {
/*
* Consumer
*/
rd_kafka_message_t **rkmessages = NULL;
#if 0 /* Future API */
/* The offset storage file is optional but its presence
* avoids starting all over from offset 0 again when
* the program restarts.
* ZooKeeper functionality will be implemented in future
* versions and then the offset will be stored there instead. */
conf.consumer.offset_file = "."; /* current directory */
/* Indicate to rdkafka that the application is responsible
* for storing the offset. This allows the application to
* successfully handle a message before storing the offset.
* If this flag is not set rdkafka will store the offset
* just prior to returning the message from rd_kafka_consume().
*/
conf.flags |= RD_KAFKA_CONF_F_APP_OFFSET_STORE;
#endif
/* Create Kafka handle */
if (!(rk = rd_kafka_new(RD_KAFKA_CONSUMER, conf,
errstr, sizeof(errstr)))) {
fprintf(stderr,
"%% Failed to create Kafka consumer: %s\n",
errstr);
exit(1);
}
if (debug)
rd_kafka_set_log_level(rk, 7);
/* Add broker(s) */
if (rd_kafka_brokers_add(rk, brokers) < 1) {
fprintf(stderr, "%% No valid brokers specified\n");
exit(1);
}
/* Create topic to consume from */
rkt = rd_kafka_topic_new(rk, topic, topic_conf);
/* Batch consumer */
if (batch_size)
rkmessages = malloc(sizeof(*rkmessages) * batch_size);
/* Start consuming */
if (rd_kafka_consume_start(rkt, partition, start_offset) == -1){
fprintf(stderr, "%% Failed to start consuming: %s\n",
rd_kafka_err2str(rd_kafka_errno2err(errno)));
exit(1);
}
cnt.t_start = rd_clock();
while (run && (msgcnt == -1 || msgcnt > cnt.msgs)) {
/* Consume messages.
* A message may either be a real message, or
* an error signaling (if rkmessage->err is set).
*/
uint64_t latency;
int r;
latency = rd_clock();
if (batch_size) {
int i;
/* Batch fetch mode */
r = rd_kafka_consume_batch(rkt, partition,
1000,
rkmessages,
batch_size);
if (r != -1) {
for (i = 0 ; i < r ; i++) {
msg_consume(rkmessages[i],NULL);
rd_kafka_message_destroy(
rkmessages[i]);
}
}
} else {
/* Callback mode */
r = rd_kafka_consume_callback(rkt, partition,
1000/*timeout*/,
msg_consume,
NULL);
}
cnt.t_latency += rd_clock() - latency;
if (r == -1)
fprintf(stderr, "%% Error: %s\n",
rd_kafka_err2str(
rd_kafka_errno2err(errno)));
print_stats(mode, otype, compression);
/* Poll to handle stats callbacks */
rd_kafka_poll(rk, 0);
}
cnt.t_end = rd_clock();
/* Stop consuming */
rd_kafka_consume_stop(rkt, partition);
/* Destroy topic */
rd_kafka_topic_destroy(rkt);
if (batch_size)
free(rkmessages);
/* Destroy the handle */
rd_kafka_destroy(rk);
}
print_stats(mode, otype|_OTYPE_FORCE, compression);
if (cnt.t_latency && cnt.msgs)
printf("%% Average application fetch latency: %"PRIu64"us\n",
cnt.t_latency / cnt.msgs);
if (stats_cmd) {
pclose(stats_fp);
stats_fp = NULL;
}
/* Let background threads clean up and terminate cleanly. */
rd_kafka_wait_destroyed(2000);
return 0;
}
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