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rdkafka_broker.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.
*/
#if defined(__MINGW32__)
#include <ws2tcpip.h>
#endif
#ifndef _WIN32
#define _GNU_SOURCE
/*
* AIX defines this and the value needs to be set correctly. For Solaris,
* src/rd.h defines _POSIX_SOURCE to be 200809L, which corresponds to XPG7,
* which itself is not compatible with _XOPEN_SOURCE on that platform.
*/
#if !defined(_AIX) && !defined(__sun)
#define _XOPEN_SOURCE
#endif
#include <signal.h>
#endif
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include "rd.h"
#include "rdaddr.h"
#include "rdkafka_int.h"
#include "rdkafka_msg.h"
#include "rdkafka_msgset.h"
#include "rdkafka_topic.h"
#include "rdkafka_partition.h"
#include "rdkafka_broker.h"
#include "rdkafka_offset.h"
#include "rdkafka_telemetry.h"
#include "rdkafka_transport.h"
#include "rdkafka_proto.h"
#include "rdkafka_buf.h"
#include "rdkafka_request.h"
#include "rdkafka_sasl.h"
#include "rdkafka_interceptor.h"
#include "rdkafka_idempotence.h"
#include "rdkafka_txnmgr.h"
#include "rdkafka_fetcher.h"
#include "rdtime.h"
#include "rdcrc32.h"
#include "rdrand.h"
#include "rdkafka_lz4.h"
#if WITH_SSL
#include <openssl/err.h>
#endif
#include "rdendian.h"
#include "rdunittest.h"
static const int rd_kafka_max_block_ms = 1000;
const char *rd_kafka_broker_state_names[] = {
"INIT", "DOWN", "TRY_CONNECT", "CONNECT", "SSL_HANDSHAKE",
"AUTH_LEGACY", "UP", "UPDATE", "APIVERSION_QUERY", "AUTH_HANDSHAKE",
"AUTH_REQ", "REAUTH"};
const char *rd_kafka_secproto_names[] = {
[RD_KAFKA_PROTO_PLAINTEXT] = "plaintext",
[RD_KAFKA_PROTO_SSL] = "ssl",
[RD_KAFKA_PROTO_SASL_PLAINTEXT] = "sasl_plaintext",
[RD_KAFKA_PROTO_SASL_SSL] = "sasl_ssl",
NULL};
/**
* @returns true for logical brokers (e.g., coordinators) without an address set
*
* @locks_required rkb_lock
*/
#define rd_kafka_broker_is_addrless(rkb) (*(rkb)->rkb_nodename == '\0')
/**
* @returns true if the broker needs a persistent connection
* @locaility broker thread
*/
static RD_INLINE rd_bool_t
rd_kafka_broker_needs_persistent_connection(rd_kafka_broker_t *rkb) {
return rkb->rkb_persistconn.internal ||
rd_atomic32_get(&rkb->rkb_persistconn.coord);
}
/**
* @returns > 0 if a connection to this broker is needed, else 0.
* @locality broker thread
* @locks none
*/
static RD_INLINE int rd_kafka_broker_needs_connection(rd_kafka_broker_t *rkb) {
return rkb->rkb_state == RD_KAFKA_BROKER_STATE_INIT &&
!rd_kafka_terminating(rkb->rkb_rk) &&
!rd_kafka_fatal_error_code(rkb->rkb_rk) &&
(!rkb->rkb_rk->rk_conf.sparse_connections ||
rd_kafka_broker_needs_persistent_connection(rkb));
}
static void rd_kafka_broker_handle_purge_queues(rd_kafka_broker_t *rkb,
rd_kafka_op_t *rko);
static void rd_kafka_broker_trigger_monitors(rd_kafka_broker_t *rkb);
#define rd_kafka_broker_terminating(rkb) \
(rd_refcnt_get(&(rkb)->rkb_refcnt) <= 1)
/**
* Construct broker nodename.
*/
static void rd_kafka_mk_nodename(char *dest,
size_t dsize,
const char *name,
uint16_t port) {
rd_snprintf(dest, dsize, "%s:%hu", name, port);
}
/**
* Construct descriptive broker name
*/
static void rd_kafka_mk_brokername(char *dest,
size_t dsize,
rd_kafka_secproto_t proto,
const char *nodename,
int32_t nodeid,
rd_kafka_confsource_t source) {
/* Prepend protocol name to brokername, unless it is a
* standard plaintext or logical broker in which case we
* omit the protocol part. */
if (proto != RD_KAFKA_PROTO_PLAINTEXT && source != RD_KAFKA_LOGICAL) {
int r = rd_snprintf(dest, dsize, "%s://",
rd_kafka_secproto_names[proto]);
if (r >= (int)dsize) /* Skip proto name if it wont fit.. */
r = 0;
dest += r;
dsize -= r;
}
if (nodeid == RD_KAFKA_NODEID_UA)
rd_snprintf(dest, dsize, "%s%s", nodename,
source == RD_KAFKA_LOGICAL
? ""
: (source == RD_KAFKA_INTERNAL ? "/internal"
: "/bootstrap"));
else
rd_snprintf(dest, dsize, "%s/%" PRId32, nodename, nodeid);
}
/**
* @brief Enable protocol feature(s) for the current broker.
*
* @locks broker_lock MUST be held
* @locality broker thread
*/
static void rd_kafka_broker_feature_enable(rd_kafka_broker_t *rkb,
int features) {
if (features & rkb->rkb_features)
return;
rkb->rkb_features |= features;
rd_rkb_dbg(rkb, BROKER | RD_KAFKA_DBG_PROTOCOL | RD_KAFKA_DBG_FEATURE,
"FEATURE", "Updated enabled protocol features +%s to %s",
rd_kafka_features2str(features),
rd_kafka_features2str(rkb->rkb_features));
}
/**
* @brief Disable protocol feature(s) for the current broker.
*
* @locks broker_lock MUST be held
* @locality broker thread
*/
static void rd_kafka_broker_feature_disable(rd_kafka_broker_t *rkb,
int features) {
if (!(features & rkb->rkb_features))
return;
rkb->rkb_features &= ~features;
rd_rkb_dbg(rkb, BROKER | RD_KAFKA_DBG_PROTOCOL | RD_KAFKA_DBG_FEATURE,
"FEATURE", "Updated enabled protocol features -%s to %s",
rd_kafka_features2str(features),
rd_kafka_features2str(rkb->rkb_features));
}
/**
* @brief Set protocol feature(s) for the current broker.
*
* @remark This replaces the previous feature set.
*
* @locality broker thread
* @locks rd_kafka_broker_lock()
*/
static void rd_kafka_broker_features_set(rd_kafka_broker_t *rkb, int features) {
if (rkb->rkb_features == features)
return;
rkb->rkb_features = features;
rd_rkb_dbg(rkb, BROKER, "FEATURE",
"Updated enabled protocol features to %s",
rd_kafka_features2str(rkb->rkb_features));
}
/**
* @brief Check and return supported ApiVersion for \p ApiKey.
*
* @returns the highest supported ApiVersion in the specified range (inclusive)
* or -1 if the ApiKey is not supported or no matching ApiVersion.
* The current feature set is also returned in \p featuresp
*
* @remark Same as rd_kafka_broker_ApiVersion_supported except for locking.
*
* @locks rd_kafka_broker_lock() if do_lock is rd_false
* @locks_acquired rd_kafka_broker_lock() if do_lock is rd_true
* @locality any
*/
int16_t rd_kafka_broker_ApiVersion_supported0(rd_kafka_broker_t *rkb,
int16_t ApiKey,
int16_t minver,
int16_t maxver,
int *featuresp,
rd_bool_t do_lock) {
struct rd_kafka_ApiVersion skel = {.ApiKey = ApiKey};
struct rd_kafka_ApiVersion ret = RD_ZERO_INIT, *retp;
if (do_lock)
rd_kafka_broker_lock(rkb);
if (featuresp)
*featuresp = rkb->rkb_features;
if (rkb->rkb_features & RD_KAFKA_FEATURE_UNITTEST) {
/* For unit tests let the broker support everything. */
if (do_lock)
rd_kafka_broker_unlock(rkb);
return maxver;
}
retp =
bsearch(&skel, rkb->rkb_ApiVersions, rkb->rkb_ApiVersions_cnt,
sizeof(*rkb->rkb_ApiVersions), rd_kafka_ApiVersion_key_cmp);
if (retp)
ret = *retp;
if (do_lock)
rd_kafka_broker_unlock(rkb);
if (!retp)
return -1;
if (ret.MaxVer < maxver) {
if (ret.MaxVer < minver)
return -1;
else
return ret.MaxVer;
} else if (ret.MinVer > maxver)
return -1;
else
return maxver;
}
/**
* @brief Check and return supported ApiVersion for \p ApiKey.
*
* @returns the highest supported ApiVersion in the specified range (inclusive)
* or -1 if the ApiKey is not supported or no matching ApiVersion.
* The current feature set is also returned in \p featuresp
* @locks none
* @locks_acquired rd_kafka_broker_lock()
* @locality any
*/
int16_t rd_kafka_broker_ApiVersion_supported(rd_kafka_broker_t *rkb,
int16_t ApiKey,
int16_t minver,
int16_t maxver,
int *featuresp) {
return rd_kafka_broker_ApiVersion_supported0(
rkb, ApiKey, minver, maxver, featuresp, rd_true /* do_lock */);
}
/**
* @brief Set broker state.
*
* \c rkb->rkb_state is the previous state, while
* \p state is the new state.
*
* @locks rd_kafka_broker_lock() MUST be held.
* @locality broker thread
*/
void rd_kafka_broker_set_state(rd_kafka_broker_t *rkb, int state) {
rd_bool_t trigger_monitors = rd_false;
if ((int)rkb->rkb_state == state)
return;
rd_kafka_dbg(rkb->rkb_rk, BROKER, "STATE",
"%s: Broker changed state %s -> %s", rkb->rkb_name,
rd_kafka_broker_state_names[rkb->rkb_state],
rd_kafka_broker_state_names[state]);
if (rkb->rkb_source == RD_KAFKA_INTERNAL) {
/* no-op */
} else if (state == RD_KAFKA_BROKER_STATE_DOWN &&
!rkb->rkb_down_reported) {
/* Propagate ALL_BROKERS_DOWN event if all brokers are
* now down, unless we're terminating.
* Only trigger for brokers that has an address set,
* e.g., not logical brokers that lost their address. */
if (rd_atomic32_add(&rkb->rkb_rk->rk_broker_down_cnt, 1) ==
rd_atomic32_get(&rkb->rkb_rk->rk_broker_cnt) -
rd_atomic32_get(
&rkb->rkb_rk->rk_broker_addrless_cnt) &&
!rd_kafka_broker_is_addrless(rkb) &&
!rd_kafka_terminating(rkb->rkb_rk))
rd_kafka_op_err(
rkb->rkb_rk, RD_KAFKA_RESP_ERR__ALL_BROKERS_DOWN,
"%i/%i brokers are down",
rd_atomic32_get(&rkb->rkb_rk->rk_broker_down_cnt),
rd_atomic32_get(&rkb->rkb_rk->rk_broker_cnt) -
rd_atomic32_get(
&rkb->rkb_rk->rk_broker_addrless_cnt));
rkb->rkb_down_reported = 1;
} else if (rd_kafka_broker_state_is_up(state) &&
rkb->rkb_down_reported) {
rd_atomic32_sub(&rkb->rkb_rk->rk_broker_down_cnt, 1);
rkb->rkb_down_reported = 0;
}
if (rkb->rkb_source != RD_KAFKA_INTERNAL) {
if (rd_kafka_broker_state_is_up(state) &&
!rd_kafka_broker_state_is_up(rkb->rkb_state)) {
/* Up -> Down */
rd_atomic32_add(&rkb->rkb_rk->rk_broker_up_cnt, 1);
trigger_monitors = rd_true;
if (RD_KAFKA_BROKER_IS_LOGICAL(rkb))
rd_atomic32_add(
&rkb->rkb_rk->rk_logical_broker_up_cnt, 1);
} else if (rd_kafka_broker_state_is_up(rkb->rkb_state) &&
!rd_kafka_broker_state_is_up(state)) {
/* ~Down(!Up) -> Up */
rd_atomic32_sub(&rkb->rkb_rk->rk_broker_up_cnt, 1);
trigger_monitors = rd_true;
if (RD_KAFKA_BROKER_IS_LOGICAL(rkb))
rd_atomic32_sub(
&rkb->rkb_rk->rk_logical_broker_up_cnt, 1);
}
/* If the connection or connection attempt failed and there
* are coord_reqs or cgrp awaiting this coordinator to come up
* then trigger the monitors so that rd_kafka_coord_req_fsm()
* is triggered, which in turn may trigger a new coordinator
* query. */
if (state == RD_KAFKA_BROKER_STATE_DOWN &&
rd_atomic32_get(&rkb->rkb_persistconn.coord) > 0)
trigger_monitors = rd_true;
}
rkb->rkb_state = state;
rkb->rkb_ts_state = rd_clock();
if (trigger_monitors)
rd_kafka_broker_trigger_monitors(rkb);
/* Call on_broker_state_change interceptors */
rd_kafka_interceptors_on_broker_state_change(
rkb->rkb_rk, rkb->rkb_nodeid,
rd_kafka_secproto_names[rkb->rkb_proto], rkb->rkb_origname,
rkb->rkb_port, rd_kafka_broker_state_names[rkb->rkb_state]);
rd_kafka_brokers_broadcast_state_change(rkb->rkb_rk);
}
/**
* @brief Set, log and propagate broker fail error.
*
* @param rkb Broker connection that failed.
* @param level Syslog level. LOG_DEBUG will not be logged unless debugging
* is enabled.
* @param err The type of error that occurred.
* @param fmt Format string.
* @param ap Format string arguments.
*
* @locks none
* @locality broker thread
*/
static void rd_kafka_broker_set_error(rd_kafka_broker_t *rkb,
int level,
rd_kafka_resp_err_t err,
const char *fmt,
va_list ap) {
char errstr[512];
char extra[128];
size_t of = 0, ofe;
rd_bool_t identical, suppress;
int state_duration_ms = (int)((rd_clock() - rkb->rkb_ts_state) / 1000);
/* If this is a logical broker we include its current nodename/address
* in the log message. */
rd_kafka_broker_lock(rkb);
if (rkb->rkb_source == RD_KAFKA_LOGICAL &&
!rd_kafka_broker_is_addrless(rkb)) {
of = (size_t)rd_snprintf(errstr, sizeof(errstr),
"%s: ", rkb->rkb_nodename);
if (of > sizeof(errstr))
of = 0; /* If nodename overflows the entire buffer we
* skip it completely since the error message
* itself is more important. */
}
rd_kafka_broker_unlock(rkb);
ofe = (size_t)rd_vsnprintf(errstr + of, sizeof(errstr) - of, fmt, ap);
if (ofe > sizeof(errstr) - of)
ofe = sizeof(errstr) - of;
of += ofe;
/* Provide more meaningful error messages in certain cases */
if (err == RD_KAFKA_RESP_ERR__TRANSPORT &&
!strcmp(errstr, "Disconnected")) {
if (rkb->rkb_state == RD_KAFKA_BROKER_STATE_APIVERSION_QUERY) {
/* A disconnect while requesting ApiVersion typically
* means we're connecting to a SSL-listener as
* PLAINTEXT, but may also be caused by connecting to
* a broker that does not support ApiVersion (<0.10). */
if (rkb->rkb_proto != RD_KAFKA_PROTO_SSL &&
rkb->rkb_proto != RD_KAFKA_PROTO_SASL_SSL)
rd_kafka_broker_set_error(
rkb, level, err,
"Disconnected while requesting "
"ApiVersion: "
"might be caused by incorrect "
"security.protocol configuration "
"(connecting to a SSL listener?) or "
"broker version is < 0.10 "
"(see api.version.request)",
ap /*ignored*/);
else
rd_kafka_broker_set_error(
rkb, level, err,
"Disconnected while requesting "
"ApiVersion: "
"might be caused by broker version "
"< 0.10 (see api.version.request)",
ap /*ignored*/);
return;
} else if (rkb->rkb_state == RD_KAFKA_BROKER_STATE_UP &&
state_duration_ms < 2000 /*2s*/ &&
rkb->rkb_rk->rk_conf.security_protocol !=
RD_KAFKA_PROTO_SASL_SSL &&
rkb->rkb_rk->rk_conf.security_protocol !=
RD_KAFKA_PROTO_SASL_PLAINTEXT) {
/* If disconnected shortly after transitioning to UP
* state it typically means the broker listener is
* configured for SASL authentication but the client
* is not. */
rd_kafka_broker_set_error(
rkb, level, err,
"Disconnected: verify that security.protocol "
"is correctly configured, broker might "
"require SASL authentication",
ap /*ignored*/);
return;
}
}
/* Check if error is identical to last error (prior to appending
* the variable suffix "after Xms in state Y"), if so we should
* suppress it. */
identical = err == rkb->rkb_last_err.err &&
!strcmp(rkb->rkb_last_err.errstr, errstr);
suppress = identical && rd_interval(&rkb->rkb_suppress.fail_error,
30 * 1000 * 1000 /*30s*/, 0) <= 0;
/* Copy last error prior to adding extras */
rkb->rkb_last_err.err = err;
rd_strlcpy(rkb->rkb_last_err.errstr, errstr,
sizeof(rkb->rkb_last_err.errstr));
/* Time since last state change to help debug connection issues */
ofe = rd_snprintf(extra, sizeof(extra), "after %dms in state %s",
state_duration_ms,
rd_kafka_broker_state_names[rkb->rkb_state]);
/* Number of suppressed identical logs */
if (identical && !suppress && rkb->rkb_last_err.cnt >= 1 &&
ofe + 30 < sizeof(extra)) {
size_t r =
(size_t)rd_snprintf(extra + ofe, sizeof(extra) - ofe,
", %d identical error(s) suppressed",
rkb->rkb_last_err.cnt);
if (r < sizeof(extra) - ofe)
ofe += r;
else
ofe = sizeof(extra);
}
/* Append the extra info if there is enough room */
if (ofe > 0 && of + ofe + 4 < sizeof(errstr))
rd_snprintf(errstr + of, sizeof(errstr) - of, " (%s)", extra);
/* Don't log interrupt-wakeups when terminating */
if (err == RD_KAFKA_RESP_ERR__INTR && rd_kafka_terminating(rkb->rkb_rk))
suppress = rd_true;
if (!suppress)
rkb->rkb_last_err.cnt = 1;
else
rkb->rkb_last_err.cnt++;
rd_rkb_dbg(rkb, BROKER, "FAIL", "%s (%s)%s%s", errstr,
rd_kafka_err2name(err),
identical ? ": identical to last error" : "",
suppress ? ": error log suppressed" : "");
if (level != LOG_DEBUG && (level <= LOG_CRIT || !suppress)) {
rd_kafka_log(rkb->rkb_rk, level, "FAIL", "%s: %s",
rkb->rkb_name, errstr);
/* Send ERR op to application for processing. */
rd_kafka_q_op_err(rkb->rkb_rk->rk_rep, err, "%s: %s",
rkb->rkb_name, errstr);
}
}
/**
* @brief Failure propagation to application.
*
* Will tear down connection to broker and trigger a reconnect.
*
* \p level is the log level, <=LOG_INFO will be logged while =LOG_DEBUG will
* be debug-logged.
*
* @locality broker thread
*/
void rd_kafka_broker_fail(rd_kafka_broker_t *rkb,
int level,
rd_kafka_resp_err_t err,
const char *fmt,
...) {
va_list ap;
rd_kafka_bufq_t tmpq_waitresp, tmpq;
int old_state;
rd_kafka_toppar_t *rktp;
rd_kafka_assert(rkb->rkb_rk, thrd_is_current(rkb->rkb_thread));
if (rkb->rkb_transport) {
rd_kafka_transport_close(rkb->rkb_transport);
rkb->rkb_transport = NULL;
if (rkb->rkb_state >= RD_KAFKA_BROKER_STATE_UP)
rd_atomic32_add(&rkb->rkb_c.disconnects, 1);
}
rkb->rkb_req_timeouts = 0;
if (rkb->rkb_recv_buf) {
rd_kafka_buf_destroy(rkb->rkb_recv_buf);
rkb->rkb_recv_buf = NULL;
}
rkb->rkb_reauth_in_progress = rd_false;
va_start(ap, fmt);
rd_kafka_broker_set_error(rkb, level, err, fmt, ap);
va_end(ap);
rd_kafka_broker_lock(rkb);
/* If we're currently asking for ApiVersion and the connection
* went down it probably means the broker does not support that request
* and tore down the connection. In this case we disable that feature
* flag. */
if (rkb->rkb_state == RD_KAFKA_BROKER_STATE_APIVERSION_QUERY)
rd_kafka_broker_feature_disable(rkb,
RD_KAFKA_FEATURE_APIVERSION);
/* Set broker state */
old_state = rkb->rkb_state;
rd_kafka_broker_set_state(rkb, RD_KAFKA_BROKER_STATE_DOWN);
/* Stop any pending reauth timer, since a teardown/reconnect will
* require a new timer. */
rd_kafka_timer_stop(&rkb->rkb_rk->rk_timers, &rkb->rkb_sasl_reauth_tmr,
1 /*lock*/);
/* Unlock broker since a requeue will try to lock it. */
rd_kafka_broker_unlock(rkb);
rd_atomic64_set(&rkb->rkb_c.ts_send, 0);
rd_atomic64_set(&rkb->rkb_c.ts_recv, 0);
/*
* Purge all buffers
* (put bufs on a temporary queue since bufs may be requeued,
* make sure outstanding requests are re-enqueued before
* bufs on outbufs queue.)
*/
rd_kafka_bufq_init(&tmpq_waitresp);
rd_kafka_bufq_init(&tmpq);
rd_kafka_bufq_concat(&tmpq_waitresp, &rkb->rkb_waitresps);
rd_kafka_bufq_concat(&tmpq, &rkb->rkb_outbufs);
rd_atomic32_init(&rkb->rkb_blocking_request_cnt, 0);
/* Purge the in-flight buffers (might get re-enqueued in case
* of retries). */
rd_kafka_bufq_purge(rkb, &tmpq_waitresp, err);
/* Purge the waiting-in-output-queue buffers,
* might also get re-enqueued. */
rd_kafka_bufq_purge(rkb, &tmpq,
/* If failure was caused by a timeout,
* adjust the error code for in-queue requests. */
err == RD_KAFKA_RESP_ERR__TIMED_OUT
? RD_KAFKA_RESP_ERR__TIMED_OUT_QUEUE
: err);
/* Update bufq for connection reset:
* - Purge connection-setup requests from outbufs since they will be
* reissued on the next connect.
* - Reset any partially sent buffer's offset.
*/
rd_kafka_bufq_connection_reset(rkb, &rkb->rkb_outbufs);
/* Extra debugging for tracking termination-hang issues:
* show what is keeping this broker from decommissioning. */
if (rd_kafka_terminating(rkb->rkb_rk) &&
!rd_kafka_broker_terminating(rkb)) {
rd_rkb_dbg(rkb, BROKER | RD_KAFKA_DBG_PROTOCOL, "BRKTERM",
"terminating: broker still has %d refcnt(s), "
"%" PRId32 " buffer(s), %d partition(s)",
rd_refcnt_get(&rkb->rkb_refcnt),
rd_kafka_bufq_cnt(&rkb->rkb_outbufs),
rkb->rkb_toppar_cnt);
rd_kafka_bufq_dump(rkb, "BRKOUTBUFS", &rkb->rkb_outbufs);
}
/* If this broker acts as the preferred (follower) replica for any
* partition, delegate the partition back to the leader. */
TAILQ_FOREACH(rktp, &rkb->rkb_toppars, rktp_rkblink) {
rd_kafka_toppar_lock(rktp);
if (unlikely(rktp->rktp_broker != rkb)) {
/* Currently migrating away from this
* broker, skip. */
rd_kafka_toppar_unlock(rktp);
continue;
}
rd_kafka_toppar_unlock(rktp);
if (rktp->rktp_leader_id != rktp->rktp_broker_id) {
rd_kafka_toppar_delegate_to_leader(rktp);
}
}
/* If the broker is the preferred telemetry broker, remove it. */
/* TODO(milind): check if this right. */
mtx_lock(&rkb->rkb_rk->rk_telemetry.lock);
if (rkb->rkb_rk->rk_telemetry.preferred_broker == rkb) {
rd_kafka_dbg(rkb->rkb_rk, TELEMETRY, "TELBRKLOST",
"Lost telemetry broker %s due to state change",
rkb->rkb_name);
rd_kafka_broker_destroy(
rkb->rkb_rk->rk_telemetry.preferred_broker);
rkb->rkb_rk->rk_telemetry.preferred_broker = NULL;
}
mtx_unlock(&rkb->rkb_rk->rk_telemetry.lock);
/* Query for topic leaders to quickly pick up on failover. */
if (err != RD_KAFKA_RESP_ERR__DESTROY &&
old_state >= RD_KAFKA_BROKER_STATE_UP)
rd_kafka_metadata_refresh_known_topics(
rkb->rkb_rk, NULL, rd_true /*force*/, "broker down");
}
/**
* @brief Handle broker connection close.
*
* @locality broker thread
*/
void rd_kafka_broker_conn_closed(rd_kafka_broker_t *rkb,
rd_kafka_resp_err_t err,
const char *errstr) {
int log_level = LOG_ERR;
if (!rkb->rkb_rk->rk_conf.log_connection_close) {
/* Silence all connection closes */
log_level = LOG_DEBUG;
} else {
/* Silence close logs for connections that are idle,
* it is most likely the broker's idle connection
* reaper kicking in.
*
* Indications there might be an error and not an
* idle disconnect:
* - If the connection age is low a disconnect
* typically indicates a failure, such as protocol mismatch.
* - If the connection hasn't been idle long enough.
* - There are outstanding requests, or requests enqueued.
*
* For non-idle connections, adjust log level:
* - requests in-flight: LOG_WARNING
* - else: LOG_INFO
*/
rd_ts_t now = rd_clock();
rd_ts_t minidle =
RD_MAX(60 * 1000 /*60s*/,
rkb->rkb_rk->rk_conf.socket_timeout_ms) *
1000;
int inflight = rd_kafka_bufq_cnt(&rkb->rkb_waitresps);
int inqueue = rd_kafka_bufq_cnt(&rkb->rkb_outbufs);
if (rkb->rkb_ts_state + minidle < now &&
rd_atomic64_get(&rkb->rkb_c.ts_send) + minidle < now &&
inflight + inqueue == 0)
log_level = LOG_DEBUG;
else if (inflight > 1)
log_level = LOG_WARNING;
else
log_level = LOG_INFO;
}
rd_kafka_broker_fail(rkb, log_level, err, "%s", errstr);
}
/**
* @brief Purge requests in \p rkbq matching request \p ApiKey
* and partition \p rktp.
*
* @warning ApiKey must be RD_KAFKAP_Produce
*
* @returns the number of purged buffers.
*
* @locality broker thread
*/
static int rd_kafka_broker_bufq_purge_by_toppar(rd_kafka_broker_t *rkb,
rd_kafka_bufq_t *rkbq,
int64_t ApiKey,
rd_kafka_toppar_t *rktp,
rd_kafka_resp_err_t err) {
rd_kafka_buf_t *rkbuf, *tmp;
int cnt = 0;
rd_assert(ApiKey == RD_KAFKAP_Produce);
TAILQ_FOREACH_SAFE(rkbuf, &rkbq->rkbq_bufs, rkbuf_link, tmp) {
if (rkbuf->rkbuf_reqhdr.ApiKey != ApiKey ||
rkbuf->rkbuf_u.Produce.batch.rktp != rktp ||
/* Skip partially sent buffers and let them transmit.
* The alternative would be to kill the connection here,
* which is more drastic and costly. */
rd_slice_offset(&rkbuf->rkbuf_reader) > 0)
continue;
rd_kafka_bufq_deq(rkbq, rkbuf);
rd_kafka_buf_callback(rkb->rkb_rk, rkb, err, NULL, rkbuf);
cnt++;
}
return cnt;
}
/**
* Scan bufq for buffer timeouts, trigger buffer callback on timeout.
*
* If \p partial_cntp is non-NULL any partially sent buffers will increase
* the provided counter by 1.
*
* @param ApiKey Only match requests with this ApiKey, or -1 for all.
* @param now If 0, all buffers will time out, else the current clock.
* @param description "N requests timed out <description>", e.g., "in flight".
* Only used if log_first_n > 0.
* @param log_first_n Log the first N request timeouts.
*
* @returns the number of timed out buffers.
*
* @locality broker thread
*/
static int rd_kafka_broker_bufq_timeout_scan(rd_kafka_broker_t *rkb,
int is_waitresp_q,
rd_kafka_bufq_t *rkbq,
int *partial_cntp,
int16_t ApiKey,
rd_kafka_resp_err_t err,
rd_ts_t now,
const char *description,
int log_first_n) {
rd_kafka_buf_t *rkbuf, *tmp;
int cnt = 0;
int idx = -1;
const rd_kafka_buf_t *holb;
restart:
holb = TAILQ_FIRST(&rkbq->rkbq_bufs);
TAILQ_FOREACH_SAFE(rkbuf, &rkbq->rkbq_bufs, rkbuf_link, tmp) {
rd_kafka_broker_state_t pre_state, post_state;
idx++;
if (likely(now && rkbuf->rkbuf_ts_timeout > now))
continue;
if (ApiKey != -1 && rkbuf->rkbuf_reqhdr.ApiKey != ApiKey)
continue;
if (partial_cntp && rd_slice_offset(&rkbuf->rkbuf_reader) > 0)
(*partial_cntp)++;
/* Convert rkbuf_ts_sent to elapsed time since request */
if (rkbuf->rkbuf_ts_sent)
rkbuf->rkbuf_ts_sent = now - rkbuf->rkbuf_ts_sent;
else
rkbuf->rkbuf_ts_sent = now - rkbuf->rkbuf_ts_enq;
rd_kafka_bufq_deq(rkbq, rkbuf);
if (now && cnt < log_first_n) {
char holbstr[256];
/* Head of line blocking:
* If this is not the first request in queue, but the
* initial first request did not time out,
* it typically means the first request is a
* long-running blocking one, holding up the
* sub-sequent requests.
* In this case log what is likely holding up the
* requests and what caused this request to time out. */
if (holb && holb == TAILQ_FIRST(&rkbq->rkbq_bufs)) {
rd_snprintf(
holbstr, sizeof(holbstr),
": possibly held back by "
"preceeding%s %sRequest with "
"timeout in %dms",
(holb->rkbuf_flags & RD_KAFKA_OP_F_BLOCKING)
? " blocking"
: "",
rd_kafka_ApiKey2str(
holb->rkbuf_reqhdr.ApiKey),
(int)((holb->rkbuf_ts_timeout - now) /
1000));
/* Only log the HOLB once */
holb = NULL;
} else {
*holbstr = '\0';
}
rd_rkb_log(
rkb, LOG_NOTICE, "REQTMOUT",
"Timed out %sRequest %s "
"(after %" PRId64 "ms, timeout #%d)%s",
rd_kafka_ApiKey2str(rkbuf->rkbuf_reqhdr.ApiKey),
description, rkbuf->rkbuf_ts_sent / 1000, cnt,
holbstr);
}
if (is_waitresp_q &&
rkbuf->rkbuf_flags & RD_KAFKA_OP_F_BLOCKING &&
rd_atomic32_sub(&rkb->rkb_blocking_request_cnt, 1) == 0)
rd_kafka_brokers_broadcast_state_change(rkb->rkb_rk);
pre_state = rd_kafka_broker_get_state(rkb);
rd_kafka_buf_callback(rkb->rkb_rk, rkb, err, NULL, rkbuf);
cnt++;
/* If the buf_callback() triggered a broker state change
* (typically through broker_fail()) we can't trust the
* queue we are scanning to not have been touched, so we
* either restart the scan or bail out (if broker is now down),
* depending on the new state. #2326 */
post_state = rd_kafka_broker_get_state(rkb);
if (pre_state != post_state) {
/* If the new state is DOWN it means broker_fail()
* was called which may have modified the queues,
* to keep things safe we stop scanning this queue. */
if (post_state == RD_KAFKA_BROKER_STATE_DOWN)
break;
/* Else start scanning the queue from the beginning. */
goto restart;
}
}
return cnt;
}
/**
* Scan the wait-response and outbuf queues for message timeouts.
*
* Locality: Broker thread
*/
static void rd_kafka_broker_timeout_scan(rd_kafka_broker_t *rkb, rd_ts_t now) {
int inflight_cnt, retry_cnt, outq_cnt;
int partial_cnt = 0;
rd_kafka_assert(rkb->rkb_rk, thrd_is_current(rkb->rkb_thread));
/* In-flight requests waiting for response */
inflight_cnt = rd_kafka_broker_bufq_timeout_scan(
rkb, 1, &rkb->rkb_waitresps, NULL, -1, RD_KAFKA_RESP_ERR__TIMED_OUT,
now, "in flight", 5);
/* Requests in retry queue */
retry_cnt = rd_kafka_broker_bufq_timeout_scan(
rkb, 0, &rkb->rkb_retrybufs, NULL, -1,
RD_KAFKA_RESP_ERR__TIMED_OUT_QUEUE, now, "in retry queue", 0);
/* Requests in local queue not sent yet.
* partial_cnt is included in outq_cnt and denotes a request
* that has been partially transmitted. */
outq_cnt = rd_kafka_broker_bufq_timeout_scan(
rkb, 0, &rkb->rkb_outbufs, &partial_cnt, -1,
RD_KAFKA_RESP_ERR__TIMED_OUT_QUEUE, now, "in output queue", 0);
if (inflight_cnt + retry_cnt + outq_cnt + partial_cnt > 0) {
rd_rkb_log(rkb, LOG_WARNING, "REQTMOUT",
"Timed out %i in-flight, %i retry-queued, "
"%i out-queue, %i partially-sent requests",
inflight_cnt, retry_cnt, outq_cnt, partial_cnt);
rkb->rkb_req_timeouts += inflight_cnt + outq_cnt;
rd_atomic64_add(&rkb->rkb_c.req_timeouts,
inflight_cnt + outq_cnt);
/* If this was a partially sent request that timed out, or the
* number of timed out requests have reached the
* socket.max.fails threshold, we need to take down the
* connection. */
if (partial_cnt > 0 ||
(rkb->rkb_rk->rk_conf.socket_max_fails &&
rkb->rkb_req_timeouts >=
rkb->rkb_rk->rk_conf.socket_max_fails &&
rkb->rkb_state >= RD_KAFKA_BROKER_STATE_UP)) {
char rttinfo[32];
/* Print average RTT (if avail) to help diagnose. */
rd_avg_calc(&rkb->rkb_avg_rtt, now);
rd_avg_calc(
&rkb->rkb_telemetry.rd_avg_current.rkb_avg_rtt,
now);
if (rkb->rkb_avg_rtt.ra_v.avg)
rd_snprintf(rttinfo, sizeof(rttinfo),
" (average rtt %.3fms)",
(float)(rkb->rkb_avg_rtt.ra_v.avg /
1000.0f));
else if (rkb->rkb_telemetry.rd_avg_current.rkb_avg_rtt
.ra_v.avg)
rd_snprintf(
rttinfo, sizeof(rttinfo),
" (average rtt %.3fms)",
(float)(rkb->rkb_telemetry.rd_avg_current
.rkb_avg_rtt.ra_v.avg /
1000.0f));
else