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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2021, 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.
*/
#include "test.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 */
typedef struct consumer_s {
const char *what;
rd_kafka_queue_t *rkq;
int timeout_ms;
int consume_msg_cnt;
int expected_msg_cnt;
rd_kafka_t *rk;
uint64_t testid;
test_msgver_t *mv;
struct test *test;
} consumer_t;
static int consumer_batch_queue(void *arg) {
consumer_t *arguments = arg;
int msg_cnt = 0;
int i;
test_timing_t t_cons;
rd_kafka_queue_t *rkq = arguments->rkq;
int timeout_ms = arguments->timeout_ms;
const int consume_msg_cnt = arguments->consume_msg_cnt;
rd_kafka_t *rk = arguments->rk;
uint64_t testid = arguments->testid;
rd_kafka_message_t **rkmessage =
malloc(consume_msg_cnt * sizeof(*rkmessage));
if (arguments->test)
test_curr = arguments->test;
TEST_SAY(
"%s calling consume_batch_queue(timeout=%d, msgs=%d) "
"and expecting %d messages back\n",
rd_kafka_name(rk), timeout_ms, consume_msg_cnt,
arguments->expected_msg_cnt);
TIMING_START(&t_cons, "CONSUME");
msg_cnt = (int)rd_kafka_consume_batch_queue(rkq, timeout_ms, rkmessage,
consume_msg_cnt);
TIMING_STOP(&t_cons);
TEST_SAY("%s consumed %d/%d/%d message(s)\n", rd_kafka_name(rk),
msg_cnt, arguments->consume_msg_cnt,
arguments->expected_msg_cnt);
TEST_ASSERT(msg_cnt == arguments->expected_msg_cnt,
"consumed %d messages, expected %d", msg_cnt,
arguments->expected_msg_cnt);
for (i = 0; i < msg_cnt; i++) {
if (test_msgver_add_msg(rk, arguments->mv, rkmessage[i]) == 0)
TEST_FAIL(
"The message is not from testid "
"%" PRId64 " \n",
testid);
rd_kafka_message_destroy(rkmessage[i]);
}
free(rkmessage);
return 0;
}
/**
* @brief Produce 400 messages and consume 500 messages totally by 2 consumers
* using batch queue method, verify if there isn't any missed or
* duplicate messages received by the two consumers.
* The reasons for setting the consume messages number is higher than
* or equal to the produce messages number are:
* 1) Make sure each consumer can at most receive half of the produced
* messages even though the consumers expect more.
* 2) If the consume messages number is smaller than the produce
* messages number, it's hard to verify that the messages returned
* are added to the batch queue before or after the rebalancing.
* But if the consume messages number is larger than the produce
* messages number, and we still received half of the produced
* messages by each consumer, we can make sure that the buffer
* cleaning is happened during the batch queue process to guarantee
* only received messages added to the batch queue after the
* rebalance.
*
* 1. Produce 100 messages to each of the 4 partitions
* 2. First consumer subscribes to the topic, wait for it's assignment
* 3. The first consumer consumes 500 messages using the batch queue
* method
* 4. Second consumer subscribes to the topic, wait for it's assignment
* 5. Rebalance happenes
* 6. The second consumer consumes 500 messages using the batch queue
* method
* 7. Each consumer receives 200 messages finally
* 8. Combine all the messages received by the 2 consumers and
* verify if there isn't any missed or duplicate messages
*
*/
static void do_test_consume_batch(const char *strategy) {
const int partition_cnt = 4;
rd_kafka_queue_t *rkq1, *rkq2;
const char *topic;
rd_kafka_t *c1;
rd_kafka_t *c2;
int p;
const int timeout_ms = 12000; /* Must be > rebalance time */
uint64_t testid;
const int consume_msg_cnt = 500;
const int produce_msg_cnt = 400;
rd_kafka_conf_t *conf;
consumer_t c1_args = RD_ZERO_INIT;
consumer_t c2_args = RD_ZERO_INIT;
test_msgver_t mv;
thrd_t thread_id;
SUB_TEST("partition.assignment.strategy = %s", strategy);
test_conf_init(&conf, NULL, 60);
test_conf_set(conf, "enable.auto.commit", "false");
test_conf_set(conf, "auto.offset.reset", "earliest");
test_conf_set(conf, "partition.assignment.strategy", strategy);
testid = test_id_generate();
test_msgver_init(&mv, testid);
/* Produce messages */
topic = test_mk_topic_name("0122-buffer_cleaning", 1);
for (p = 0; p < partition_cnt; p++)
test_produce_msgs_easy(topic, testid, p,
produce_msg_cnt / partition_cnt);
/* Create consumers */
c1 = test_create_consumer(topic, NULL, rd_kafka_conf_dup(conf), NULL);
c2 = test_create_consumer(topic, NULL, conf, NULL);
test_consumer_subscribe(c1, topic);
test_consumer_wait_assignment(c1, rd_false);
/* Create generic consume queue */
rkq1 = rd_kafka_queue_get_consumer(c1);
c1_args.what = "C1.PRE";
c1_args.rkq = rkq1;
c1_args.timeout_ms = timeout_ms;
c1_args.consume_msg_cnt = consume_msg_cnt;
c1_args.expected_msg_cnt = produce_msg_cnt / 2;
c1_args.rk = c1;
c1_args.testid = testid;
c1_args.mv = &mv;
c1_args.test = test_curr;
if (thrd_create(&thread_id, consumer_batch_queue, &c1_args) !=
thrd_success)
TEST_FAIL("Failed to create thread for %s", "C1.PRE");
test_consumer_subscribe(c2, topic);
test_consumer_wait_assignment(c2, rd_false);
thrd_join(thread_id, NULL);
/* Create generic consume queue */
rkq2 = rd_kafka_queue_get_consumer(c2);
c2_args.what = "C2.PRE";
c2_args.rkq = rkq2;
/* Second consumer should be able to consume all messages right away */
c2_args.timeout_ms = 5000;
c2_args.consume_msg_cnt = consume_msg_cnt;
c2_args.expected_msg_cnt = produce_msg_cnt / 2;
c2_args.rk = c2;
c2_args.testid = testid;
c2_args.mv = &mv;
consumer_batch_queue(&c2_args);
test_msgver_verify("C1.PRE + C2.PRE", &mv,
TEST_MSGVER_ORDER | TEST_MSGVER_DUP, 0,
produce_msg_cnt);
test_msgver_clear(&mv);
rd_kafka_queue_destroy(rkq1);
rd_kafka_queue_destroy(rkq2);
test_consumer_close(c1);
test_consumer_close(c2);
rd_kafka_destroy(c1);
rd_kafka_destroy(c2);
SUB_TEST_PASS();
}
int main_0122_buffer_cleaning_after_rebalance(int argc, char **argv) {
do_test_consume_batch("range");
do_test_consume_batch("cooperative-sticky");
return 0;
}
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