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rdkafka_metadata.c
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rdkafka_metadata.c
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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2012-2022, Magnus Edenhill
* 2023, Confluent Inc.
* 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 "rd.h"
#include "rdkafka_int.h"
#include "rdkafka_topic.h"
#include "rdkafka_broker.h"
#include "rdkafka_request.h"
#include "rdkafka_idempotence.h"
#include "rdkafka_metadata.h"
#include <string.h>
#include <stdarg.h>
/**
* @brief Id comparator for rd_kafka_metadata_broker_internal_t
*/
int rd_kafka_metadata_broker_internal_cmp(const void *_a, const void *_b) {
const rd_kafka_metadata_broker_internal_t *a = _a;
const rd_kafka_metadata_broker_internal_t *b = _b;
return RD_CMP(a->id, b->id);
}
/**
* @brief Id comparator for struct rd_kafka_metadata_broker*
*/
int rd_kafka_metadata_broker_cmp(const void *_a, const void *_b) {
const struct rd_kafka_metadata_broker *a = _a;
const struct rd_kafka_metadata_broker *b = _b;
return RD_CMP(a->id, b->id);
}
/**
* @brief Id comparator for rd_kafka_metadata_partition_internal_t
*/
static int rd_kafka_metadata_partition_internal_cmp(const void *_a,
const void *_b) {
const rd_kafka_metadata_partition_internal_t *a = _a;
const rd_kafka_metadata_partition_internal_t *b = _b;
return RD_CMP(a->id, b->id);
}
/**
* @brief Helper function to clear a rd_kafka_metadata_partition.
*
* @note Does not deallocate the rd_kafka_metadata_partition itself.
* @note Should not be used if there is an metadata struct allocated with
* tmpabuf in which rd_kafka_metadata_partition is contained.
*/
void rd_kafka_metadata_partition_clear(
struct rd_kafka_metadata_partition *rkmp) {
RD_IF_FREE(rkmp->isrs, rd_free);
RD_IF_FREE(rkmp->replicas, rd_free);
}
rd_kafka_resp_err_t
rd_kafka_metadata(rd_kafka_t *rk,
int all_topics,
rd_kafka_topic_t *only_rkt,
const struct rd_kafka_metadata **metadatap,
int timeout_ms) {
rd_kafka_q_t *rkq;
rd_kafka_broker_t *rkb;
rd_kafka_op_t *rko;
rd_ts_t ts_end = rd_timeout_init(timeout_ms);
rd_list_t topics;
rd_bool_t allow_auto_create_topics =
rk->rk_conf.allow_auto_create_topics;
/* Query any broker that is up, and if none are up pick the first one,
* if we're lucky it will be up before the timeout */
rkb = rd_kafka_broker_any_usable(rk, timeout_ms, RD_DO_LOCK, 0,
"application metadata request");
if (!rkb)
return RD_KAFKA_RESP_ERR__TRANSPORT;
rkq = rd_kafka_q_new(rk);
rd_list_init(&topics, 0, rd_free);
if (!all_topics) {
if (only_rkt)
rd_list_add(&topics,
rd_strdup(rd_kafka_topic_name(only_rkt)));
else {
int cache_cnt;
rd_kafka_local_topics_to_list(rkb->rkb_rk, &topics,
&cache_cnt);
/* Don't trigger auto-create for cached topics */
if (rd_list_cnt(&topics) == cache_cnt)
allow_auto_create_topics = rd_true;
}
}
/* Async: request metadata */
rko = rd_kafka_op_new(RD_KAFKA_OP_METADATA);
rd_kafka_op_set_replyq(rko, rkq, 0);
rko->rko_u.metadata.force = 1; /* Force metadata request regardless
* of outstanding metadata requests. */
rd_kafka_MetadataRequest(
rkb, &topics, "application requested", allow_auto_create_topics,
/* cgrp_update:
* Only update consumer group state
* on response if this lists all
* topics in the cluster, since a
* partial request may make it seem
* like some subscribed topics are missing. */
all_topics ? rd_true : rd_false, rd_false /* force_racks */, rko);
rd_list_destroy(&topics);
rd_kafka_broker_destroy(rkb);
/* Wait for reply (or timeout) */
rko = rd_kafka_q_pop(rkq, rd_timeout_remains_us(ts_end), 0);
rd_kafka_q_destroy_owner(rkq);
/* Timeout */
if (!rko)
return RD_KAFKA_RESP_ERR__TIMED_OUT;
/* Error */
if (rko->rko_err) {
rd_kafka_resp_err_t err = rko->rko_err;
rd_kafka_op_destroy(rko);
return err;
}
/* Reply: pass metadata pointer to application who now owns it*/
rd_kafka_assert(rk, rko->rko_u.metadata.md);
*metadatap = rko->rko_u.metadata.md;
rko->rko_u.metadata.md = NULL;
rko->rko_u.metadata.mdi = NULL;
rd_kafka_op_destroy(rko);
return RD_KAFKA_RESP_ERR_NO_ERROR;
}
void rd_kafka_metadata_destroy(const struct rd_kafka_metadata *metadata) {
rd_free((void *)metadata);
}
static rd_kafka_metadata_internal_t *rd_kafka_metadata_copy_internal(
const rd_kafka_metadata_internal_t *src_internal,
size_t size,
rd_bool_t populate_racks) {
struct rd_kafka_metadata *md;
rd_kafka_metadata_internal_t *mdi;
const struct rd_kafka_metadata *src = &src_internal->metadata;
rd_tmpabuf_t tbuf;
int i;
/* metadata is stored in one contigious buffer where structs and
* and pointed-to fields are layed out in a memory aligned fashion.
* rd_tmpabuf_t provides the infrastructure to do this.
* Because of this we copy all the structs verbatim but
* any pointer fields needs to be copied explicitly to update
* the pointer address. */
rd_tmpabuf_new(&tbuf, size, rd_true /*assert on fail*/);
rd_tmpabuf_finalize(&tbuf);
mdi = rd_tmpabuf_write(&tbuf, src, sizeof(*mdi));
md = &mdi->metadata;
rd_tmpabuf_write_str(&tbuf, src->orig_broker_name);
/* Copy Brokers */
md->brokers = rd_tmpabuf_write(&tbuf, src->brokers,
src->broker_cnt * sizeof(*src->brokers));
/* Copy internal Brokers */
mdi->brokers =
rd_tmpabuf_write(&tbuf, src_internal->brokers,
src->broker_cnt * sizeof(*src_internal->brokers));
for (i = 0; i < md->broker_cnt; i++) {
md->brokers[i].host =
rd_tmpabuf_write_str(&tbuf, src->brokers[i].host);
if (src_internal->brokers[i].rack_id) {
mdi->brokers[i].rack_id = rd_tmpabuf_write_str(
&tbuf, src_internal->brokers[i].rack_id);
}
}
/* Copy TopicMetadata */
md->topics = rd_tmpabuf_write(&tbuf, src->topics,
md->topic_cnt * sizeof(*md->topics));
/* Copy internal TopicMetadata */
mdi->topics =
rd_tmpabuf_write(&tbuf, src_internal->topics,
md->topic_cnt * sizeof(*src_internal->topics));
for (i = 0; i < md->topic_cnt; i++) {
int j;
md->topics[i].topic =
rd_tmpabuf_write_str(&tbuf, src->topics[i].topic);
/* Copy partitions */
md->topics[i].partitions =
rd_tmpabuf_write(&tbuf, src->topics[i].partitions,
md->topics[i].partition_cnt *
sizeof(*md->topics[i].partitions));
/* Copy internal partitions */
mdi->topics[i].partitions = rd_tmpabuf_write(
&tbuf, src_internal->topics[i].partitions,
md->topics[i].partition_cnt *
sizeof(*src_internal->topics[i].partitions));
for (j = 0; j < md->topics[i].partition_cnt; j++) {
int k;
char *rack;
rd_list_t *curr_list;
/* Copy replicas and ISRs */
md->topics[i].partitions[j].replicas = rd_tmpabuf_write(
&tbuf, src->topics[i].partitions[j].replicas,
md->topics[i].partitions[j].replica_cnt *
sizeof(*md->topics[i].partitions[j].replicas));
md->topics[i].partitions[j].isrs = rd_tmpabuf_write(
&tbuf, src->topics[i].partitions[j].isrs,
md->topics[i].partitions[j].isr_cnt *
sizeof(*md->topics[i].partitions[j].isrs));
mdi->topics[i].partitions[j].racks_cnt = 0;
mdi->topics[i].partitions[j].racks = NULL;
/* Iterate through replicas and populate racks, if
* needed. */
if (!populate_racks)
continue;
/* This is quite possibly a recomputation, because we've
* already done this for the src_internal. However,
* since the racks need to point inside the tmpbuf, we
* make this calculation again. Since this is done only
* in a case of a full metadata refresh, this will be
* fairly rare. */
curr_list = rd_list_new(0, NULL);
for (k = 0; k < md->topics[i].partitions[j].replica_cnt;
k++) {
rd_kafka_metadata_broker_internal_t key = {
.id = md->topics[i]
.partitions[j]
.replicas[k]};
rd_kafka_metadata_broker_internal_t *found =
bsearch(
&key, mdi->brokers, md->broker_cnt,
sizeof(
rd_kafka_metadata_broker_internal_t),
rd_kafka_metadata_broker_internal_cmp);
if (!found || !found->rack_id)
continue;
rd_list_add(curr_list, found->rack_id);
}
if (!rd_list_cnt(curr_list)) {
rd_list_destroy(curr_list);
continue;
}
rd_list_deduplicate(&curr_list, rd_strcmp2);
mdi->topics[i].partitions[j].racks_cnt =
rd_list_cnt(curr_list);
mdi->topics[i].partitions[j].racks = rd_tmpabuf_alloc(
&tbuf, sizeof(char *) * rd_list_cnt(curr_list));
RD_LIST_FOREACH(rack, curr_list, k) {
/* We don't copy here,`rack` points to memory
* inside `mdi` already, and it's allocated
* within a tmpabuf. So, the lifetime of
* mdi->topics[i].partitions[j].racks[k] is the
* same as the lifetime of the outer `mdi`. */
mdi->topics[i].partitions[j].racks[k] = rack;
}
rd_list_destroy(curr_list);
}
}
/* Check for tmpabuf errors */
if (rd_tmpabuf_failed(&tbuf))
rd_kafka_assert(NULL, !*"metadata copy failed");
/* Deliberately not destroying the tmpabuf since we return
* its allocated memory. */
return mdi;
}
/**
* @returns a newly allocated copy of metadata \p src of size \p size
*/
rd_kafka_metadata_internal_t *
rd_kafka_metadata_copy(const rd_kafka_metadata_internal_t *src_internal,
size_t size) {
return rd_kafka_metadata_copy_internal(src_internal, size, rd_false);
}
/**
* @returns a newly allocated copy of metadata \p src of size \p size, with
* partition racks included.
*/
rd_kafka_metadata_internal_t *rd_kafka_metadata_copy_add_racks(
const rd_kafka_metadata_internal_t *src_internal,
size_t size) {
return rd_kafka_metadata_copy_internal(src_internal, size, rd_true);
}
/**
* @brief Update topic state and information based on topic metadata.
*
* @param mdt Topic metadata.
* @param mdit Topic internal metadata.
*
* @locality rdkafka main thread
* @locks_acquired rd_kafka_wrlock(rk)
*/
static void rd_kafka_parse_Metadata_update_topic(
rd_kafka_broker_t *rkb,
const rd_kafka_metadata_topic_t *mdt,
const rd_kafka_metadata_topic_internal_t *mdit) {
rd_rkb_dbg(rkb, METADATA, "METADATA",
/* The indent below is intentional */
" Topic %s with %i partitions%s%s", mdt->topic,
mdt->partition_cnt, mdt->err ? ": " : "",
mdt->err ? rd_kafka_err2str(mdt->err) : "");
/* Ignore metadata completely for temporary errors. (issue #513)
* LEADER_NOT_AVAILABLE: Broker is rebalancing
*/
if (mdt->err == RD_KAFKA_RESP_ERR_LEADER_NOT_AVAILABLE &&
mdt->partition_cnt == 0) {
rd_rkb_dbg(rkb, TOPIC, "METADATA",
"Temporary error in metadata reply for "
"topic %s (PartCnt %i): %s: ignoring",
mdt->topic, mdt->partition_cnt,
rd_kafka_err2str(mdt->err));
} else {
/* Update local topic & partition state based
* on metadata */
rd_kafka_topic_metadata_update2(rkb, mdt, mdit);
}
}
/**
* @brief Only brokers with Metadata version >= 9 have reliable leader
* epochs. Before that version, leader epoch must be treated
* as missing (-1).
*
* @param rkb The broker
* @return Is this a broker version with reliable leader epochs?
*
* @locality rdkafka main thread
*/
rd_bool_t rd_kafka_has_reliable_leader_epochs(rd_kafka_broker_t *rkb) {
int features;
int16_t ApiVersion = 0;
ApiVersion = rd_kafka_broker_ApiVersion_supported(
rkb, RD_KAFKAP_Metadata, 0, 9, &features);
return ApiVersion >= 9;
}
/* Populates the topic partition to rack mapping for the the topic given by
* `topic_idx` in the `mdi`. It's assumed that the internal broker metadata is
* already populated. */
static void
rd_kafka_populate_metadata_topic_racks(rd_tmpabuf_t *tbuf,
size_t topic_idx,
rd_kafka_metadata_internal_t *mdi) {
rd_kafka_metadata_broker_internal_t *brokers_internal;
size_t broker_cnt;
int i;
rd_kafka_metadata_topic_t *mdt;
rd_kafka_metadata_topic_internal_t *mdti;
rd_dassert(mdi->brokers);
rd_dassert(mdi->metadata.topic_cnt > (int)topic_idx);
brokers_internal = mdi->brokers;
broker_cnt = mdi->metadata.broker_cnt;
mdt = &mdi->metadata.topics[topic_idx];
mdti = &mdi->topics[topic_idx];
for (i = 0; i < mdt->partition_cnt; i++) {
int j;
rd_kafka_metadata_partition_t *mdp = &mdt->partitions[i];
rd_kafka_metadata_partition_internal_t *mdpi =
&mdti->partitions[i];
rd_list_t *curr_list;
char *rack;
if (mdp->replica_cnt == 0)
continue;
curr_list =
rd_list_new(0, NULL); /* use a list for de-duplication */
for (j = 0; j < mdp->replica_cnt; j++) {
rd_kafka_metadata_broker_internal_t key = {
.id = mdp->replicas[j]};
rd_kafka_metadata_broker_internal_t *broker =
bsearch(&key, brokers_internal, broker_cnt,
sizeof(rd_kafka_metadata_broker_internal_t),
rd_kafka_metadata_broker_internal_cmp);
if (!broker || !broker->rack_id)
continue;
rd_list_add(curr_list, broker->rack_id);
}
rd_list_deduplicate(&curr_list, rd_strcmp2);
mdpi->racks_cnt = rd_list_cnt(curr_list);
mdpi->racks =
rd_tmpabuf_alloc(tbuf, sizeof(char *) * mdpi->racks_cnt);
RD_LIST_FOREACH(rack, curr_list, j) {
mdpi->racks[j] = rack; /* Don't copy, rack points inside
tbuf already*/
}
rd_list_destroy(curr_list);
}
}
/* Internal implementation for parsing Metadata. */
static rd_kafka_resp_err_t
rd_kafka_parse_Metadata0(rd_kafka_broker_t *rkb,
rd_kafka_buf_t *request,
rd_kafka_buf_t *rkbuf,
rd_kafka_metadata_internal_t **mdip,
rd_list_t *request_topics,
const char *reason) {
rd_kafka_t *rk = rkb->rkb_rk;
int i, j, k;
rd_tmpabuf_t tbuf;
rd_kafka_metadata_internal_t *mdi = NULL;
rd_kafka_metadata_t *md = NULL;
size_t rkb_namelen;
const int log_decode_errors = LOG_ERR;
rd_list_t *missing_topics = NULL;
const rd_list_t *requested_topics = request_topics;
rd_bool_t all_topics = rd_false;
rd_bool_t cgrp_update = rd_false;
rd_bool_t has_reliable_leader_epochs =
rd_kafka_has_reliable_leader_epochs(rkb);
int ApiVersion = rkbuf->rkbuf_reqhdr.ApiVersion;
rd_kafkap_str_t cluster_id = RD_ZERO_INIT;
int32_t controller_id = -1;
rd_kafka_resp_err_t err = RD_KAFKA_RESP_ERR_NO_ERROR;
int broker_changes = 0;
int cache_changes = 0;
rd_ts_t ts_start = rd_clock();
/* If client rack is present, the metadata cache (topic or full) needs
* to contain the partition to rack map. */
rd_bool_t has_client_rack = rk->rk_conf.client_rack &&
RD_KAFKAP_STR_LEN(rk->rk_conf.client_rack);
rd_bool_t compute_racks = has_client_rack;
if (request) {
requested_topics = request->rkbuf_u.Metadata.topics;
all_topics = request->rkbuf_u.Metadata.all_topics;
cgrp_update =
request->rkbuf_u.Metadata.cgrp_update && rk->rk_cgrp;
compute_racks |= request->rkbuf_u.Metadata.force_racks;
}
/* If there's reason is NULL, set it to a human-readable string. */
if (!reason)
reason = "(no reason)";
/* Ignore metadata updates when terminating */
if (rd_kafka_terminating(rkb->rkb_rk)) {
err = RD_KAFKA_RESP_ERR__DESTROY;
goto done;
}
rd_kafka_assert(NULL, thrd_is_current(rk->rk_thread));
/* Remove topics from missing_topics as they are seen in Metadata. */
if (requested_topics)
missing_topics =
rd_list_copy(requested_topics, rd_list_string_copy, NULL);
rd_kafka_broker_lock(rkb);
rkb_namelen = strlen(rkb->rkb_name) + 1;
/* We assume that the marshalled representation is
* no more than 4 times larger than the wire representation.
* This is increased to 5 times in case if we want to compute partition
* to rack mapping. */
rd_tmpabuf_new(&tbuf, 0, rd_false /*dont assert on fail*/);
rd_tmpabuf_add_alloc(&tbuf, sizeof(*mdi));
rd_tmpabuf_add_alloc(&tbuf, rkb_namelen);
rd_tmpabuf_add_alloc(&tbuf, rkbuf->rkbuf_totlen *
(4 + (compute_racks ? 1 : 0)));
rd_tmpabuf_finalize(&tbuf);
if (!(mdi = rd_tmpabuf_alloc(&tbuf, sizeof(*mdi)))) {
rd_kafka_broker_unlock(rkb);
err = RD_KAFKA_RESP_ERR__CRIT_SYS_RESOURCE;
goto err;
}
md = &mdi->metadata;
md->orig_broker_id = rkb->rkb_nodeid;
md->orig_broker_name =
rd_tmpabuf_write(&tbuf, rkb->rkb_name, rkb_namelen);
rd_kafka_broker_unlock(rkb);
if (ApiVersion >= 3)
rd_kafka_buf_read_throttle_time(rkbuf);
/* Read Brokers */
rd_kafka_buf_read_arraycnt(rkbuf, &md->broker_cnt,
RD_KAFKAP_BROKERS_MAX);
if (!(md->brokers = rd_tmpabuf_alloc(&tbuf, md->broker_cnt *
sizeof(*md->brokers))))
rd_kafka_buf_parse_fail(rkbuf,
"%d brokers: tmpabuf memory shortage",
md->broker_cnt);
if (!(mdi->brokers = rd_tmpabuf_alloc(
&tbuf, md->broker_cnt * sizeof(*mdi->brokers))))
rd_kafka_buf_parse_fail(
rkbuf, "%d internal brokers: tmpabuf memory shortage",
md->broker_cnt);
if (!(mdi->brokers_sorted = rd_tmpabuf_alloc(
&tbuf, md->broker_cnt * sizeof(*mdi->brokers_sorted))))
rd_kafka_buf_parse_fail(
rkbuf, "%d sorted brokers: tmpabuf memory shortage",
md->broker_cnt);
for (i = 0; i < md->broker_cnt; i++) {
rd_kafka_buf_read_i32a(rkbuf, md->brokers[i].id);
rd_kafka_buf_read_str_tmpabuf(rkbuf, &tbuf,
md->brokers[i].host);
rd_kafka_buf_read_i32a(rkbuf, md->brokers[i].port);
mdi->brokers[i].id = md->brokers[i].id;
if (ApiVersion >= 1) {
rd_kafka_buf_read_str_tmpabuf(rkbuf, &tbuf,
mdi->brokers[i].rack_id);
} else {
mdi->brokers[i].rack_id = NULL;
}
rd_kafka_buf_skip_tags(rkbuf);
}
mdi->cluster_id = NULL;
if (ApiVersion >= 2) {
rd_kafka_buf_read_str(rkbuf, &cluster_id);
if (cluster_id.str)
mdi->cluster_id =
rd_tmpabuf_write_str(&tbuf, cluster_id.str);
}
mdi->controller_id = -1;
if (ApiVersion >= 1) {
rd_kafka_buf_read_i32(rkbuf, &controller_id);
mdi->controller_id = controller_id;
rd_rkb_dbg(rkb, METADATA, "METADATA",
"ClusterId: %.*s, ControllerId: %" PRId32,
RD_KAFKAP_STR_PR(&cluster_id), controller_id);
}
qsort(mdi->brokers, md->broker_cnt, sizeof(mdi->brokers[i]),
rd_kafka_metadata_broker_internal_cmp);
memcpy(mdi->brokers_sorted, md->brokers,
sizeof(*mdi->brokers_sorted) * md->broker_cnt);
qsort(mdi->brokers_sorted, md->broker_cnt, sizeof(*mdi->brokers_sorted),
rd_kafka_metadata_broker_cmp);
/* Read TopicMetadata */
rd_kafka_buf_read_arraycnt(rkbuf, &md->topic_cnt, RD_KAFKAP_TOPICS_MAX);
rd_rkb_dbg(rkb, METADATA, "METADATA", "%i brokers, %i topics",
md->broker_cnt, md->topic_cnt);
if (!(md->topics =
rd_tmpabuf_alloc(&tbuf, md->topic_cnt * sizeof(*md->topics))))
rd_kafka_buf_parse_fail(
rkbuf, "%d topics: tmpabuf memory shortage", md->topic_cnt);
if (!(mdi->topics = rd_tmpabuf_alloc(&tbuf, md->topic_cnt *
sizeof(*mdi->topics))))
rd_kafka_buf_parse_fail(
rkbuf, "%d internal topics: tmpabuf memory shortage",
md->topic_cnt);
for (i = 0; i < md->topic_cnt; i++) {
rd_kafka_buf_read_i16a(rkbuf, md->topics[i].err);
rd_kafka_buf_read_str_tmpabuf(rkbuf, &tbuf,
md->topics[i].topic);
if (ApiVersion >= 10) {
rd_kafka_buf_read_uuid(rkbuf, &mdi->topics[i].topic_id);
}
if (ApiVersion >= 1)
rd_kafka_buf_read_bool(rkbuf,
&mdi->topics[i].is_internal);
/* PartitionMetadata */
rd_kafka_buf_read_arraycnt(rkbuf, &md->topics[i].partition_cnt,
RD_KAFKAP_PARTITIONS_MAX);
if (!(md->topics[i].partitions = rd_tmpabuf_alloc(
&tbuf, md->topics[i].partition_cnt *
sizeof(*md->topics[i].partitions))))
rd_kafka_buf_parse_fail(rkbuf,
"%s: %d partitions: "
"tmpabuf memory shortage",
md->topics[i].topic,
md->topics[i].partition_cnt);
if (!(mdi->topics[i].partitions = rd_tmpabuf_alloc(
&tbuf, md->topics[i].partition_cnt *
sizeof(*mdi->topics[i].partitions))))
rd_kafka_buf_parse_fail(rkbuf,
"%s: %d internal partitions: "
"tmpabuf memory shortage",
md->topics[i].topic,
md->topics[i].partition_cnt);
for (j = 0; j < md->topics[i].partition_cnt; j++) {
rd_kafka_buf_read_i16a(rkbuf,
md->topics[i].partitions[j].err);
rd_kafka_buf_read_i32a(rkbuf,
md->topics[i].partitions[j].id);
rd_kafka_buf_read_i32a(
rkbuf, md->topics[i].partitions[j].leader);
mdi->topics[i].partitions[j].id =
md->topics[i].partitions[j].id;
if (ApiVersion >= 7) {
rd_kafka_buf_read_i32(
rkbuf,
&mdi->topics[i].partitions[j].leader_epoch);
if (!has_reliable_leader_epochs)
mdi->topics[i]
.partitions[j]
.leader_epoch = -1;
} else {
mdi->topics[i].partitions[j].leader_epoch = -1;
}
mdi->topics[i].partitions[j].racks_cnt = 0;
mdi->topics[i].partitions[j].racks = NULL;
/* Replicas */
rd_kafka_buf_read_arraycnt(
rkbuf, &md->topics[i].partitions[j].replica_cnt,
RD_KAFKAP_BROKERS_MAX);
if (!(md->topics[i].partitions[j].replicas =
rd_tmpabuf_alloc(
&tbuf,
md->topics[i].partitions[j].replica_cnt *
sizeof(*md->topics[i]
.partitions[j]
.replicas))))
rd_kafka_buf_parse_fail(
rkbuf,
"%s [%" PRId32
"]: %d replicas: "
"tmpabuf memory shortage",
md->topics[i].topic,
md->topics[i].partitions[j].id,
md->topics[i].partitions[j].replica_cnt);
for (k = 0; k < md->topics[i].partitions[j].replica_cnt;
k++)
rd_kafka_buf_read_i32a(
rkbuf,
md->topics[i].partitions[j].replicas[k]);
/* Isrs */
rd_kafka_buf_read_arraycnt(
rkbuf, &md->topics[i].partitions[j].isr_cnt,
RD_KAFKAP_BROKERS_MAX);
if (!(md->topics[i]
.partitions[j]
.isrs = rd_tmpabuf_alloc(
&tbuf,
md->topics[i].partitions[j].isr_cnt *
sizeof(
*md->topics[i].partitions[j].isrs))))
rd_kafka_buf_parse_fail(
rkbuf,
"%s [%" PRId32
"]: %d isrs: "
"tmpabuf memory shortage",
md->topics[i].topic,
md->topics[i].partitions[j].id,
md->topics[i].partitions[j].isr_cnt);
for (k = 0; k < md->topics[i].partitions[j].isr_cnt;
k++)
rd_kafka_buf_read_i32a(
rkbuf, md->topics[i].partitions[j].isrs[k]);
if (ApiVersion >= 5) {
/* OfflineReplicas int32 array (ignored) */
int32_t offline_replicas_cnt;
/* #OfflineReplicas */
rd_kafka_buf_read_arraycnt(
rkbuf, &offline_replicas_cnt,
RD_KAFKAP_BROKERS_MAX);
rd_kafka_buf_skip(rkbuf, offline_replicas_cnt *
sizeof(int32_t));
}
rd_kafka_buf_skip_tags(rkbuf);
}
mdi->topics[i].topic_authorized_operations = -1;
if (ApiVersion >= 8) {
int32_t TopicAuthorizedOperations;
/* TopicAuthorizedOperations */
rd_kafka_buf_read_i32(rkbuf,
&TopicAuthorizedOperations);
mdi->topics[i].topic_authorized_operations =
TopicAuthorizedOperations;
}
rd_kafka_buf_skip_tags(rkbuf);
}
mdi->cluster_authorized_operations = -1;
if (ApiVersion >= 8 && ApiVersion <= 10) {
int32_t ClusterAuthorizedOperations;
/* ClusterAuthorizedOperations */
rd_kafka_buf_read_i32(rkbuf, &ClusterAuthorizedOperations);
mdi->cluster_authorized_operations =
ClusterAuthorizedOperations;
}
rd_kafka_buf_skip_tags(rkbuf);
/* Entire Metadata response now parsed without errors:
* update our internal state according to the response. */
if (md->broker_cnt == 0 && md->topic_cnt == 0) {
rd_rkb_dbg(rkb, METADATA, "METADATA",
"No brokers or topics in metadata: should retry");
err = RD_KAFKA_RESP_ERR__PARTIAL;
goto err;
}
/* Update our list of brokers. */
for (i = 0; i < md->broker_cnt; i++) {
rd_rkb_dbg(rkb, METADATA, "METADATA",
" Broker #%i/%i: %s:%i NodeId %" PRId32, i,
md->broker_cnt, md->brokers[i].host,
md->brokers[i].port, md->brokers[i].id);
rd_kafka_broker_update(rkb->rkb_rk, rkb->rkb_proto,
&md->brokers[i], NULL);
}
for (i = 0; i < md->topic_cnt; i++) {
/* Ignore topics in blacklist */
if (rkb->rkb_rk->rk_conf.topic_blacklist &&
rd_kafka_pattern_match(rkb->rkb_rk->rk_conf.topic_blacklist,
md->topics[i].topic)) {
rd_rkb_dbg(rkb, TOPIC | RD_KAFKA_DBG_METADATA,
"BLACKLIST",
"Ignoring blacklisted topic \"%s\" "
"in metadata",
md->topics[i].topic);
continue;
}
/* Sort partitions by partition id */
qsort(md->topics[i].partitions, md->topics[i].partition_cnt,
sizeof(*md->topics[i].partitions),
rd_kafka_metadata_partition_id_cmp);
qsort(mdi->topics[i].partitions, md->topics[i].partition_cnt,
sizeof(*mdi->topics[i].partitions),
rd_kafka_metadata_partition_internal_cmp);
if (compute_racks)
rd_kafka_populate_metadata_topic_racks(&tbuf, i, mdi);
/* Update topic state based on the topic metadata */
rd_kafka_parse_Metadata_update_topic(rkb, &md->topics[i],
&mdi->topics[i]);
if (requested_topics) {
rd_list_free_cb(missing_topics,
rd_list_remove_cmp(missing_topics,
md->topics[i].topic,
(void *)strcmp));
if (!all_topics) {
/* Only update cache when not asking
* for all topics. */
rd_kafka_wrlock(rk);
rd_kafka_metadata_cache_topic_update(
rk, &md->topics[i], &mdi->topics[i],
rd_false /*propagate later*/,
/* use has_client_rack rather than
compute_racks. We need cached rack ids
only in case we need to rejoin the group
if they change and client.rack is set
(KIP-881). */
has_client_rack, mdi->brokers,
md->broker_cnt);
cache_changes++;
rd_kafka_wrunlock(rk);
}
}
}
/* Requested topics not seen in metadata? Propogate to topic code. */
if (missing_topics) {
char *topic;
rd_rkb_dbg(rkb, TOPIC, "METADATA",
"%d/%d requested topic(s) seen in metadata",
rd_list_cnt(requested_topics) -
rd_list_cnt(missing_topics),
rd_list_cnt(requested_topics));
for (i = 0; i < rd_list_cnt(missing_topics); i++)
rd_rkb_dbg(rkb, TOPIC, "METADATA", "wanted %s",
(char *)(missing_topics->rl_elems[i]));
RD_LIST_FOREACH(topic, missing_topics, i) {
rd_kafka_topic_t *rkt;
rkt =
rd_kafka_topic_find(rkb->rkb_rk, topic, 1 /*lock*/);
if (rkt) {
/* Received metadata response contained no
* information about topic 'rkt' and thus
* indicates the topic is not available in the
* cluster.
* Mark the topic as non-existent */
rd_kafka_topic_wrlock(rkt);
rd_kafka_topic_set_notexists(
rkt, RD_KAFKA_RESP_ERR__UNKNOWN_TOPIC);
rd_kafka_topic_wrunlock(rkt);
rd_kafka_topic_destroy0(rkt);
}
}
}
rd_kafka_wrlock(rkb->rkb_rk);
rkb->rkb_rk->rk_ts_metadata = rd_clock();
/* Update cached cluster id. */
if (RD_KAFKAP_STR_LEN(&cluster_id) > 0 &&
(!rk->rk_clusterid ||
rd_kafkap_str_cmp_str(&cluster_id, rk->rk_clusterid))) {
rd_rkb_dbg(rkb, BROKER | RD_KAFKA_DBG_GENERIC, "CLUSTERID",
"ClusterId update \"%s\" -> \"%.*s\"",
rk->rk_clusterid ? rk->rk_clusterid : "",
RD_KAFKAP_STR_PR(&cluster_id));
if (rk->rk_clusterid) {
rd_kafka_log(rk, LOG_WARNING, "CLUSTERID",
"Broker %s reports different ClusterId "
"\"%.*s\" than previously known \"%s\": "
"a client must not be simultaneously "
"connected to multiple clusters",
rd_kafka_broker_name(rkb),
RD_KAFKAP_STR_PR(&cluster_id),
rk->rk_clusterid);
rd_free(rk->rk_clusterid);
}
rk->rk_clusterid = RD_KAFKAP_STR_DUP(&cluster_id);
/* rd_kafka_clusterid() waits for a cache update even though
* the clusterid is not in the cache itself. (#3620) */
cache_changes++;
}
/* Update controller id. */
if (rkb->rkb_rk->rk_controllerid != controller_id) {
rd_rkb_dbg(rkb, BROKER, "CONTROLLERID",
"ControllerId update %" PRId32 " -> %" PRId32,
rkb->rkb_rk->rk_controllerid, controller_id);
rkb->rkb_rk->rk_controllerid = controller_id;
broker_changes++;
}
if (all_topics) {
/* Expire all cache entries that were not updated. */
rd_kafka_metadata_cache_evict_by_age(rkb->rkb_rk, ts_start);
if (rkb->rkb_rk->rk_full_metadata)
rd_kafka_metadata_destroy(
&rkb->rkb_rk->rk_full_metadata->metadata);
/* use has_client_rack rather than compute_racks. We need cached
* rack ids only in case we need to rejoin the group if they
* change and client.rack is set (KIP-881). */
if (has_client_rack)
rkb->rkb_rk->rk_full_metadata =
rd_kafka_metadata_copy_add_racks(mdi, tbuf.of);
else
rkb->rkb_rk->rk_full_metadata =
rd_kafka_metadata_copy(mdi, tbuf.of);
rkb->rkb_rk->rk_ts_full_metadata = rkb->rkb_rk->rk_ts_metadata;
rd_rkb_dbg(rkb, METADATA, "METADATA",
"Caching full metadata with "
"%d broker(s) and %d topic(s): %s",
md->broker_cnt, md->topic_cnt, reason);
} else {
if (cache_changes)
rd_kafka_metadata_cache_propagate_changes(rk);
rd_kafka_metadata_cache_expiry_start(rk);
}
/* Remove cache hints for the originally requested topics. */
if (requested_topics)
rd_kafka_metadata_cache_purge_hints(rk, requested_topics);
rd_kafka_wrunlock(rkb->rkb_rk);
if (broker_changes) {
/* Broadcast broker metadata changes to listeners. */
rd_kafka_brokers_broadcast_state_change(rkb->rkb_rk);
}
/* Check if cgrp effective subscription is affected by
* new topic metadata.
* Ignore if this was a broker-only refresh (no topics), or
* the request was from the partition assignor (!cgrp_update)
* which may contain only a sub-set of the subscribed topics (namely
* the effective subscription of available topics) as to not
* propagate non-included topics as non-existent. */
if (cgrp_update && (requested_topics || all_topics))
rd_kafka_cgrp_metadata_update_check(rkb->rkb_rk->rk_cgrp,
rd_true /*do join*/);
/* Try to acquire a Producer ID from this broker if we
* don't have one. */
if (rd_kafka_is_idempotent(rkb->rkb_rk)) {
rd_kafka_wrlock(rkb->rkb_rk);
rd_kafka_idemp_pid_fsm(rkb->rkb_rk);
rd_kafka_wrunlock(rkb->rkb_rk);
}
done:
if (missing_topics)
rd_list_destroy(missing_topics);
/* This metadata request was triggered by someone wanting
* the metadata information back as a reply, so send that reply now.
* In this case we must not rd_free the metadata memory here,
* the requestee will do.
* The tbuf is explicitly not destroyed as we return its memory
* to the caller. */
*mdip = mdi;