clickhouse的libkafka配置

作者：很楠不爱3 | 2024-05-07 01:51:01

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libkafka

Configuration properties

Global configuration properties

Property	C/P	Range	Default	Importance	Description
builtin.features	*		gzip, snappy, ssl, sasl, regex, lz4, sasl_gssapi, sasl_plain, sasl_scram, plugins, zstd, sasl_oauthbearer, http, oidc	low	Indicates the builtin features for this build of librdkafka. An application can either query this value or attempt to set it with its list of required features to check for library support. Type: CSV flags
client.id	*		rdkafka	low	Client identifier. Type: string
metadata.broker.list	*			high	Initial list of brokers as a CSV list of broker host or host:port. The application may also use `rd_kafka_brokers_add()` to add brokers during runtime. Type: string
bootstrap.servers	*			high	Alias for `metadata.broker.list`: Initial list of brokers as a CSV list of broker host or host:port. The application may also use `rd_kafka_brokers_add()` to add brokers during runtime. Type: string
message.max.bytes	*	1000 .. 1000000000	1000000	medium	Maximum Kafka protocol request message size. Due to differing framing overhead between protocol versions the producer is unable to reliably enforce a strict max message limit at produce time and may exceed the maximum size by one message in protocol ProduceRequests, the broker will enforce the the topic's `max.message.bytes` limit (see Apache Kafka documentation). Type: integer
message.copy.max.bytes	*	0 .. 1000000000	65535	low	Maximum size for message to be copied to buffer. Messages larger than this will be passed by reference (zero-copy) at the expense of larger iovecs. Type: integer
receive.message.max.bytes	*	1000 .. 2147483647	100000000	medium	Maximum Kafka protocol response message size. This serves as a safety precaution to avoid memory exhaustion in case of protocol hickups. This value must be at least `fetch.max.bytes` + 512 to allow for protocol overhead; the value is adjusted automatically unless the configuration property is explicitly set. Type: integer
max.in.flight.requests.per.connection	*	1 .. 1000000	1000000	low	Maximum number of in-flight requests per broker connection. This is a generic property applied to all broker communication, however it is primarily relevant to produce requests. In particular, note that other mechanisms limit the number of outstanding consumer fetch request per broker to one. Type: integer
max.in.flight	*	1 .. 1000000	1000000	low	Alias for `max.in.flight.requests.per.connection`: Maximum number of in-flight requests per broker connection. This is a generic property applied to all broker communication, however it is primarily relevant to produce requests. In particular, note that other mechanisms limit the number of outstanding consumer fetch request per broker to one. Type: integer
topic.metadata.refresh.interval.ms	*	-1 .. 3600000	300000	low	Period of time in milliseconds at which topic and broker metadata is refreshed in order to proactively discover any new brokers, topics, partitions or partition leader changes. Use -1 to disable the intervalled refresh (not recommended). If there are no locally referenced topics (no topic objects created, no messages produced, no subscription or no assignment) then only the broker list will be refreshed every interval but no more often than every 10s. Type: integer
metadata.max.age.ms	*	1 .. 86400000	900000	low	Metadata cache max age. Defaults to topic.metadata.refresh.interval.ms * 3 Type: integer
topic.metadata.refresh.fast.interval.ms	*	1 .. 60000	250	low	When a topic loses its leader a new metadata request will be enqueued with this initial interval, exponentially increasing until the topic metadata has been refreshed. This is used to recover quickly from transitioning leader brokers. Type: integer
topic.metadata.refresh.fast.cnt	*	0 .. 1000	10	low	DEPRECATED No longer used. Type: integer
topic.metadata.refresh.sparse	*	true, false	true	low	Sparse metadata requests (consumes less network bandwidth) Type: boolean
topic.metadata.propagation.max.ms	*	0 .. 3600000	30000	low	Apache Kafka topic creation is asynchronous and it takes some time for a new topic to propagate throughout the cluster to all brokers. If a client requests topic metadata after manual topic creation but before the topic has been fully propagated to the broker the client is requesting metadata from, the topic will seem to be non-existent and the client will mark the topic as such, failing queued produced messages with `ERR__UNKNOWN_TOPIC`. This setting delays marking a topic as non-existent until the configured propagation max time has passed. The maximum propagation time is calculated from the time the topic is first referenced in the client, e.g., on produce(). Type: integer
topic.blacklist	*			low	Topic blacklist, a comma-separated list of regular expressions for matching topic names that should be ignored in broker metadata information as if the topics did not exist. Type: pattern list
debug	*	generic, broker, topic, metadata, feature, queue, msg, protocol, cgrp, security, fetch, interceptor, plugin, consumer, admin, eos, mock, assignor, conf, all		medium	A comma-separated list of debug contexts to enable. Detailed Producer debugging: broker,topic,msg. Consumer: consumer,cgrp,topic,fetch Type: CSV flags
socket.timeout.ms	*	10 .. 300000	60000	low	Default timeout for network requests. Producer: ProduceRequests will use the lesser value of `socket.timeout.ms` and remaining `message.timeout.ms` for the first message in the batch. Consumer: FetchRequests will use `fetch.wait.max.ms` + `socket.timeout.ms`. Admin: Admin requests will use `socket.timeout.ms` or explicitly set `rd_kafka_AdminOptions_set_operation_timeout()` value. Type: integer
socket.blocking.max.ms	*	1 .. 60000	1000	low	DEPRECATED No longer used. Type: integer
socket.send.buffer.bytes	*	0 .. 100000000	0	low	Broker socket send buffer size. System default is used if 0. Type: integer
socket.receive.buffer.bytes	*	0 .. 100000000	0	low	Broker socket receive buffer size. System default is used if 0. Type: integer
socket.keepalive.enable	*	true, false	false	low	Enable TCP keep-alives (SO_KEEPALIVE) on broker sockets Type: boolean
socket.nagle.disable	*	true, false	false	low	Disable the Nagle algorithm (TCP_NODELAY) on broker sockets. Type: boolean
socket.max.fails	*	0 .. 1000000	1	low	Disconnect from broker when this number of send failures (e.g., timed out requests) is reached. Disable with 0. WARNING: It is highly recommended to leave this setting at its default value of 1 to avoid the client and broker to become desynchronized in case of request timeouts. NOTE: The connection is automatically re-established. Type: integer
broker.address.ttl	*	0 .. 86400000	1000	low	How long to cache the broker address resolving results (milliseconds). Type: integer
broker.address.family	*	any, v4, v6	any	low	Allowed broker IP address families: any, v4, v6 Type: enum value
connections.max.idle.ms	*	0 .. 2147483647	0	medium	Close broker connections after the specified time of inactivity. Disable with 0. If this property is left at its default value some heuristics are performed to determine a suitable default value, this is currently limited to identifying brokers on Azure (see librdkafka issue #3109 for more info). Type: integer
reconnect.backoff.jitter.ms	*	0 .. 3600000	0	low	DEPRECATED No longer used. See `reconnect.backoff.ms` and `reconnect.backoff.max.ms`. Type: integer
reconnect.backoff.ms	*	0 .. 3600000	100	medium	The initial time to wait before reconnecting to a broker after the connection has been closed. The time is increased exponentially until `reconnect.backoff.max.ms` is reached. -25% to +50% jitter is applied to each reconnect backoff. A value of 0 disables the backoff and reconnects immediately. Type: integer
reconnect.backoff.max.ms	*	0 .. 3600000	10000	medium	The maximum time to wait before reconnecting to a broker after the connection has been closed. Type: integer
statistics.interval.ms	*	0 .. 86400000	0	high	librdkafka statistics emit interval. The application also needs to register a stats callback using `rd_kafka_conf_set_stats_cb()`. The granularity is 1000ms. A value of 0 disables statistics. Type: integer
enabled_events	*	0 .. 2147483647	0	low	See `rd_kafka_conf_set_events()` Type: integer
error_cb	*			low	Error callback (set with rd_kafka_conf_set_error_cb()) Type: see dedicated API
throttle_cb	*			low	Throttle callback (set with rd_kafka_conf_set_throttle_cb()) Type: see dedicated API
stats_cb	*			low	Statistics callback (set with rd_kafka_conf_set_stats_cb()) Type: see dedicated API
log_cb	*			low	Log callback (set with rd_kafka_conf_set_log_cb()) Type: see dedicated API
log_level	*	0 .. 7	6	low	Logging level (syslog(3) levels) Type: integer
log.queue	*	true, false	false	low	Disable spontaneous log_cb from internal librdkafka threads, instead enqueue log messages on queue set with `rd_kafka_set_log_queue()` and serve log callbacks or events through the standard poll APIs. NOTE: Log messages will linger in a temporary queue until the log queue has been set. Type: boolean
log.thread.name	*	true, false	true	low	Print internal thread name in log messages (useful for debugging librdkafka internals) Type: boolean
enable.random.seed	*	true, false	true	low	If enabled librdkafka will initialize the PRNG with srand(current_time.milliseconds) on the first invocation of rd_kafka_new() (required only if rand_r() is not available on your platform). If disabled the application must call srand() prior to calling rd_kafka_new(). Type: boolean
log.connection.close	*	true, false	true	low	Log broker disconnects. It might be useful to turn this off when interacting with 0.9 brokers with an aggressive `connection.max.idle.ms` value. Type: boolean
background_event_cb	*			low	Background queue event callback (set with rd_kafka_conf_set_background_event_cb()) Type: see dedicated API
socket_cb	*			low	Socket creation callback to provide race-free CLOEXEC Type: see dedicated API
connect_cb	*			low	Socket connect callback Type: see dedicated API
closesocket_cb	*			low	Socket close callback Type: see dedicated API
open_cb	*			low	File open callback to provide race-free CLOEXEC Type: see dedicated API
opaque	*			low	Application opaque (set with rd_kafka_conf_set_opaque()) Type: see dedicated API
default_topic_conf	*			low	Default topic configuration for automatically subscribed topics Type: see dedicated API
internal.termination.signal	*	0 .. 128	0	low	Signal that librdkafka will use to quickly terminate on rd_kafka_destroy(). If this signal is not set then there will be a delay before rd_kafka_wait_destroyed() returns true as internal threads are timing out their system calls. If this signal is set however the delay will be minimal. The application should mask this signal as an internal signal handler is installed. Type: integer
api.version.request	*	true, false	true	high	Request broker's supported API versions to adjust functionality to available protocol features. If set to false, or the ApiVersionRequest fails, the fallback version `broker.version.fallback` will be used. NOTE: Depends on broker version >=0.10.0. If the request is not supported by (an older) broker the `broker.version.fallback` fallback is used. Type: boolean
api.version.request.timeout.ms	*	1 .. 300000	10000	low	Timeout for broker API version requests. Type: integer
api.version.fallback.ms	*	0 .. 604800000	0	medium	Dictates how long the `broker.version.fallback` fallback is used in the case the ApiVersionRequest fails. NOTE: The ApiVersionRequest is only issued when a new connection to the broker is made (such as after an upgrade). Type: integer
broker.version.fallback	*		0.10.0	medium	Older broker versions (before 0.10.0) provide no way for a client to query for supported protocol features (ApiVersionRequest, see `api.version.request`) making it impossible for the client to know what features it may use. As a workaround a user may set this property to the expected broker version and the client will automatically adjust its feature set accordingly if the ApiVersionRequest fails (or is disabled). The fallback broker version will be used for `api.version.fallback.ms`. Valid values are: 0.9.0, 0.8.2, 0.8.1, 0.8.0. Any other value >= 0.10, such as 0.10.2.1, enables ApiVersionRequests. Type: string
security.protocol	*	plaintext, ssl, sasl_plaintext, sasl_ssl	plaintext	high	Protocol used to communicate with brokers. Type: enum value
ssl.cipher.suites	*			low	A cipher suite is a named combination of authentication, encryption, MAC and key exchange algorithm used to negotiate the security settings for a network connection using TLS or SSL network protocol. See manual page for `ciphers(1)` and `SSL_CTX_set_cipher_list(3). Type: string
ssl.curves.list	*			low	The supported-curves extension in the TLS ClientHello message specifies the curves (standard/named, or 'explicit' GF(2^k) or GF(p)) the client is willing to have the server use. See manual page for `SSL_CTX_set1_curves_list(3)`. OpenSSL >= 1.0.2 required. Type: string
ssl.sigalgs.list	*			low	The client uses the TLS ClientHello signature_algorithms extension to indicate to the server which signature/hash algorithm pairs may be used in digital signatures. See manual page for `SSL_CTX_set1_sigalgs_list(3)`. OpenSSL >= 1.0.2 required. Type: string
ssl.key.location	*			low	Path to client's private key (PEM) used for authentication. Type: string
ssl.key.password	*			low	Private key passphrase (for use with `ssl.key.location` and `set_ssl_cert()`) Type: string
ssl.key.pem	*			low	Client's private key string (PEM format) used for authentication. Type: string
ssl_key	*			low	Client's private key as set by rd_kafka_conf_set_ssl_cert() Type: see dedicated API
ssl.certificate.location	*			low	Path to client's public key (PEM) used for authentication. Type: string
ssl.certificate.pem	*			low	Client's public key string (PEM format) used for authentication. Type: string
ssl_certificate	*			low	Client's public key as set by rd_kafka_conf_set_ssl_cert() Type: see dedicated API
ssl.ca.location	*			low	File or directory path to CA certificate(s) for verifying the broker's key. Defaults: On Windows the system's CA certificates are automatically looked up in the Windows Root certificate store. On Mac OSX this configuration defaults to `probe`. It is recommended to install openssl using Homebrew, to provide CA certificates. On Linux install the distribution's ca-certificates package. If OpenSSL is statically linked or `ssl.ca.location` is set to `probe` a list of standard paths will be probed and the first one found will be used as the default CA certificate location path. If OpenSSL is dynamically linked the OpenSSL library's default path will be used (see `OPENSSLDIR` in `openssl version -a`). Type: string
ssl.ca.pem	*			low	CA certificate string (PEM format) for verifying the broker's key. Type: string
ssl_ca	*			low	CA certificate as set by rd_kafka_conf_set_ssl_cert() Type: see dedicated API
ssl.ca.certificate.stores	*		Root	low	Comma-separated list of Windows Certificate stores to load CA certificates from. Certificates will be loaded in the same order as stores are specified. If no certificates can be loaded from any of the specified stores an error is logged and the OpenSSL library's default CA location is used instead. Store names are typically one or more of: MY, Root, Trust, CA. Type: string
ssl.crl.location	*			low	Path to CRL for verifying broker's certificate validity. Type: string
ssl.keystore.location	*			low	Path to client's keystore (PKCS#12) used for authentication. Type: string
ssl.keystore.password	*			low	Client's keystore (PKCS#12) password. Type: string
ssl.engine.location	*			low	Path to OpenSSL engine library. OpenSSL >= 1.1.0 required. Type: string
ssl.engine.id	*		dynamic	low	OpenSSL engine id is the name used for loading engine. Type: string
ssl_engine_callback_data	*			low	OpenSSL engine callback data (set with rd_kafka_conf_set_engine_callback_data()). Type: see dedicated API
enable.ssl.certificate.verification	*	true, false	true	low	Enable OpenSSL's builtin broker (server) certificate verification. This verification can be extended by the application by implementing a certificate_verify_cb. Type: boolean
ssl.endpoint.identification.algorithm	*	none, https	none	low	Endpoint identification algorithm to validate broker hostname using broker certificate. https - Server (broker) hostname verification as specified in RFC2818. none - No endpoint verification. OpenSSL >= 1.0.2 required. Type: enum value
ssl.certificate.verify_cb	*			low	Callback to verify the broker certificate chain. Type: see dedicated API
sasl.mechanisms	*		GSSAPI	high	SASL mechanism to use for authentication. Supported: GSSAPI, PLAIN, SCRAM-SHA-256, SCRAM-SHA-512, OAUTHBEARER. NOTE: Despite the name only one mechanism must be configured. Type: string
sasl.mechanism	*		GSSAPI	high	Alias for `sasl.mechanisms`: SASL mechanism to use for authentication. Supported: GSSAPI, PLAIN, SCRAM-SHA-256, SCRAM-SHA-512, OAUTHBEARER. NOTE: Despite the name only one mechanism must be configured. Type: string
sasl.kerberos.service.name	*		kafka	low	Kerberos principal name that Kafka runs as, not including /hostname@REALM Type: string
sasl.kerberos.principal	*		kafkaclient	low	This client's Kerberos principal name. (Not supported on Windows, will use the logon user's principal). Type: string
sasl.kerberos.kinit.cmd	*		kinit -R -t "%{sasl.kerberos.keytab}" -k %{sasl.kerberos.principal} \|\| kinit -t "%{sasl.kerberos.keytab}" -k %{sasl.kerberos.principal}	low	Shell command to refresh or acquire the client's Kerberos ticket. This command is executed on client creation and every sasl.kerberos.min.time.before.relogin (0=disable). %{config.prop.name} is replaced by corresponding config object value. Type: string
sasl.kerberos.keytab	*			low	Path to Kerberos keytab file. This configuration property is only used as a variable in `sasl.kerberos.kinit.cmd` as `... -t "%{sasl.kerberos.keytab}"`. Type: string
sasl.kerberos.min.time.before.relogin	*	0 .. 86400000	60000	low	Minimum time in milliseconds between key refresh attempts. Disable automatic key refresh by setting this property to 0. Type: integer
sasl.username	*			high	SASL username for use with the PLAIN and SASL-SCRAM-.. mechanisms Type: string
sasl.password	*			high	SASL password for use with the PLAIN and SASL-SCRAM-.. mechanism Type: string
sasl.oauthbearer.config	*			low	SASL/OAUTHBEARER configuration. The format is implementation-dependent and must be parsed accordingly. The default unsecured token implementation (see RFC 7515 - JSON Web Signature (JWS)) recognizes space-separated name=value pairs with valid names including principalClaimName, principal, scopeClaimName, scope, and lifeSeconds. The default value for principalClaimName is "sub", the default value for scopeClaimName is "scope", and the default value for lifeSeconds is 3600. The scope value is CSV format with the default value being no/empty scope. For example: `principalClaimName=azp principal=admin scopeClaimName=roles scope=role1,role2 lifeSeconds=600`. In addition, SASL extensions can be communicated to the broker via `extension_NAME=value`. For example: `principal=admin extension_traceId=123` Type: string
enable.sasl.oauthbearer.unsecure.jwt	*	true, false	false	low	Enable the builtin unsecure JWT OAUTHBEARER token handler if no oauthbearer_refresh_cb has been set. This builtin handler should only be used for development or testing, and not in production. Type: boolean
oauthbearer_token_refresh_cb	*			low	SASL/OAUTHBEARER token refresh callback (set with rd_kafka_conf_set_oauthbearer_token_refresh_cb(), triggered by rd_kafka_poll(), et.al. This callback will be triggered when it is time to refresh the client's OAUTHBEARER token. Also see `rd_kafka_conf_enable_sasl_queue()`. Type: see dedicated API
sasl.oauthbearer.method	*	default, oidc	default	low	Set to "default" or "oidc" to control which login method is used. If set it to "oidc", OAuth/OIDC login method will be used. sasl.oauthbearer.client.id, sasl.oauthbearer.client.secret, and sasl.oauthbearer.token.endpoint.url are needed if sasl.oauthbearer.method is set to "oidc". Type: enum value
sasl.oauthbearer.client.id	*			low	It's a public identifier for the application. It must be unique across all clients that the authorization server handles. This is only used when sasl.oauthbearer.method is set to oidc. Type: string
sasl.oauthbearer.client.secret	*			low	A client secret only known to the application and the authorization server. This should be a sufficiently random string that are not guessable. This is only used when sasl.oauthbearer.method is set to "oidc". Type: string
sasl.oauthbearer.scope	*			low	Client use this to specify the scope of the access request to the broker. This is only used when sasl.oauthbearer.method is set to "oidc". Type: string
sasl.oauthbearer.extensions	*			low	Allow additional information to be provided to the broker. It's comma-separated list of key=value pairs. The example of the input is "supportFeatureX=true,organizationId=sales-emea". This is only used when sasl.oauthbearer.method is set to "oidc". Type: string
sasl.oauthbearer.token.endpoint.url	*			low	OAUTH issuer token endpoint HTTP(S) URI used to retrieve the token. This is only used when sasl.oauthbearer.method is set to "oidc". Type: string
plugin.library.paths	*			low	List of plugin libraries to load (; separated). The library search path is platform dependent (see dlopen(3) for Unix and LoadLibrary() for Windows). If no filename extension is specified the platform-specific extension (such as .dll or .so) will be appended automatically. Type: string
interceptors	*			low	Interceptors added through rd_kafka_conf_interceptor_add_..() and any configuration handled by interceptors. Type: see dedicated API
group.id	C			high	Client group id string. All clients sharing the same group.id belong to the same group. Type: string
group.instance.id	C			medium	Enable static group membership. Static group members are able to leave and rejoin a group within the configured `session.timeout.ms` without prompting a group rebalance. This should be used in combination with a larger `session.timeout.ms` to avoid group rebalances caused by transient unavailability (e.g. process restarts). Requires broker version >= 2.3.0. Type: string
partition.assignment.strategy	C		range,roundrobin	medium	The name of one or more partition assignment strategies. The elected group leader will use a strategy supported by all members of the group to assign partitions to group members. If there is more than one eligible strategy, preference is determined by the order of this list (strategies earlier in the list have higher priority). Cooperative and non-cooperative (eager) strategies must not be mixed. Available strategies: range, roundrobin, cooperative-sticky. Type: string
session.timeout.ms	C	1 .. 3600000	45000	high	Client group session and failure detection timeout. The consumer sends periodic heartbeats (heartbeat.interval.ms) to indicate its liveness to the broker. If no hearts are received by the broker for a group member within the session timeout, the broker will remove the consumer from the group and trigger a rebalance. The allowed range is configured with the broker configuration properties `group.min.session.timeout.ms` and `group.max.session.timeout.ms`. Also see `max.poll.interval.ms`. Type: integer
heartbeat.interval.ms	C	1 .. 3600000	3000	low	Group session keepalive heartbeat interval. Type: integer
group.protocol.type	C		consumer	low	Group protocol type. NOTE: Currently, the only supported group protocol type is `consumer`. Type: string
coordinator.query.interval.ms	C	1 .. 3600000	600000	low	How often to query for the current client group coordinator. If the currently assigned coordinator is down the configured query interval will be divided by ten to more quickly recover in case of coordinator reassignment. Type: integer
max.poll.interval.ms	C	1 .. 86400000	300000	high	Maximum allowed time between calls to consume messages (e.g., rd_kafka_consumer_poll()) for high-level consumers. If this interval is exceeded the consumer is considered failed and the group will rebalance in order to reassign the partitions to another consumer group member. Warning: Offset commits may be not possible at this point. Note: It is recommended to set `enable.auto.offset.store=false` for long-time processing applications and then explicitly store offsets (using offsets_store()) after message processing, to make sure offsets are not auto-committed prior to processing has finished. The interval is checked two times per second. See KIP-62 for more information. Type: integer
enable.auto.commit	C	true, false	true	high	Automatically and periodically commit offsets in the background. Note: setting this to false does not prevent the consumer from fetching previously committed start offsets. To circumvent this behaviour set specific start offsets per partition in the call to assign(). Type: boolean
auto.commit.interval.ms	C	0 .. 86400000	5000	medium	The frequency in milliseconds that the consumer offsets are committed (written) to offset storage. (0 = disable). This setting is used by the high-level consumer. Type: integer
enable.auto.offset.store	C	true, false	true	high	Automatically store offset of last message provided to application. The offset store is an in-memory store of the next offset to (auto-)commit for each partition. Type: boolean
queued.min.messages	C	1 .. 10000000	100000	medium	Minimum number of messages per topic+partition librdkafka tries to maintain in the local consumer queue. Type: integer
queued.max.messages.kbytes	C	1 .. 2097151	65536	medium	Maximum number of kilobytes of queued pre-fetched messages in the local consumer queue. If using the high-level consumer this setting applies to the single consumer queue, regardless of the number of partitions. When using the legacy simple consumer or when separate partition queues are used this setting applies per partition. This value may be overshot by fetch.message.max.bytes. This property has higher priority than queued.min.messages. Type: integer
fetch.wait.max.ms	C	0 .. 300000	500	low	Maximum time the broker may wait to fill the Fetch response with fetch.min.bytes of messages. Type: integer
fetch.message.max.bytes	C	1 .. 1000000000	1048576	medium	Initial maximum number of bytes per topic+partition to request when fetching messages from the broker. If the client encounters a message larger than this value it will gradually try to increase it until the entire message can be fetched. Type: integer
max.partition.fetch.bytes	C	1 .. 1000000000	1048576	medium	Alias for `fetch.message.max.bytes`: Initial maximum number of bytes per topic+partition to request when fetching messages from the broker. If the client encounters a message larger than this value it will gradually try to increase it until the entire message can be fetched. Type: integer
fetch.max.bytes	C	0 .. 2147483135	52428800	medium	Maximum amount of data the broker shall return for a Fetch request. Messages are fetched in batches by the consumer and if the first message batch in the first non-empty partition of the Fetch request is larger than this value, then the message batch will still be returned to ensure the consumer can make progress. The maximum message batch size accepted by the broker is defined via `message.max.bytes` (broker config) or `max.message.bytes` (broker topic config). `fetch.max.bytes` is automatically adjusted upwards to be at least `message.max.bytes` (consumer config). Type: integer
fetch.min.bytes	C	1 .. 100000000	1	low	Minimum number of bytes the broker responds with. If fetch.wait.max.ms expires the accumulated data will be sent to the client regardless of this setting. Type: integer
fetch.error.backoff.ms	C	0 .. 300000	500	medium	How long to postpone the next fetch request for a topic+partition in case of a fetch error. Type: integer
offset.store.method	C	none, file, broker	broker	low	DEPRECATED Offset commit store method: 'file' - DEPRECATED: local file store (offset.store.path, et.al), 'broker' - broker commit store (requires Apache Kafka 0.8.2 or later on the broker). Type: enum value
isolation.level	C	read_uncommitted, read_committed	read_committed	high	Controls how to read messages written transactionally: `read_committed` - only return transactional messages which have been committed. `read_uncommitted` - return all messages, even transactional messages which have been aborted. Type: enum value
consume_cb	C			low	Message consume callback (set with rd_kafka_conf_set_consume_cb()) Type: see dedicated API
rebalance_cb	C			low	Called after consumer group has been rebalanced (set with rd_kafka_conf_set_rebalance_cb()) Type: see dedicated API
offset_commit_cb	C			low	Offset commit result propagation callback. (set with rd_kafka_conf_set_offset_commit_cb()) Type: see dedicated API
enable.partition.eof	C	true, false	false	low	Emit RD_KAFKA_RESP_ERR__PARTITION_EOF event whenever the consumer reaches the end of a partition. Type: boolean
check.crcs	C	true, false	false	medium	Verify CRC32 of consumed messages, ensuring no on-the-wire or on-disk corruption to the messages occurred. This check comes at slightly increased CPU usage. Type: boolean
allow.auto.create.topics	C	true, false	false	low	Allow automatic topic creation on the broker when subscribing to or assigning non-existent topics. The broker must also be configured with `auto.create.topics.enable=true` for this configuraiton to take effect. Note: The default value (false) is different from the Java consumer (true). Requires broker version >= 0.11.0.0, for older broker versions only the broker configuration applies. Type: boolean
client.rack	*			low	A rack identifier for this client. This can be any string value which indicates where this client is physically located. It corresponds with the broker config `broker.rack`. Type: string
transactional.id	P			high	Enables the transactional producer. The transactional.id is used to identify the same transactional producer instance across process restarts. It allows the producer to guarantee that transactions corresponding to earlier instances of the same producer have been finalized prior to starting any new transactions, and that any zombie instances are fenced off. If no transactional.id is provided, then the producer is limited to idempotent delivery (if enable.idempotence is set). Requires broker version >= 0.11.0. Type: string
transaction.timeout.ms	P	1000 .. 2147483647	60000	medium	The maximum amount of time in milliseconds that the transaction coordinator will wait for a transaction status update from the producer before proactively aborting the ongoing transaction. If this value is larger than the `transaction.max.timeout.ms` setting in the broker, the init_transactions() call will fail with ERR_INVALID_TRANSACTION_TIMEOUT. The transaction timeout automatically adjusts `message.timeout.ms` and `socket.timeout.ms`, unless explicitly configured in which case they must not exceed the transaction timeout (`socket.timeout.ms` must be at least 100ms lower than `transaction.timeout.ms`). This is also the default timeout value if no timeout (-1) is supplied to the transactional API methods. Type: integer
enable.idempotence	P	true, false	false	high	When set to `true`, the producer will ensure that messages are successfully produced exactly once and in the original produce order. The following configuration properties are adjusted automatically (if not modified by the user) when idempotence is enabled: `max.in.flight.requests.per.connection=5` (must be less than or equal to 5), `retries=INT32_MAX` (must be greater than 0), `acks=all`, `queuing.strategy=fifo`. Producer instantation will fail if user-supplied configuration is incompatible. Type: boolean
enable.gapless.guarantee	P	true, false	false	low	EXPERIMENTAL: subject to change or removal. When set to `true`, any error that could result in a gap in the produced message series when a batch of messages fails, will raise a fatal error (ERR__GAPLESS_GUARANTEE) and stop the producer. Messages failing due to `message.timeout.ms` are not covered by this guarantee. Requires `enable.idempotence=true`. Type: boolean
queue.buffering.max.messages	P	1 .. 10000000	100000	high	Maximum number of messages allowed on the producer queue. This queue is shared by all topics and partitions. Type: integer
queue.buffering.max.kbytes	P	1 .. 2147483647	1048576	high	Maximum total message size sum allowed on the producer queue. This queue is shared by all topics and partitions. This property has higher priority than queue.buffering.max.messages. Type: integer
queue.buffering.max.ms	P	0 .. 900000	5	high	Delay in milliseconds to wait for messages in the producer queue to accumulate before constructing message batches (MessageSets) to transmit to brokers. A higher value allows larger and more effective (less overhead, improved compression) batches of messages to accumulate at the expense of increased message delivery latency. Type: float
linger.ms	P	0 .. 900000	5	high	Alias for `queue.buffering.max.ms`: Delay in milliseconds to wait for messages in the producer queue to accumulate before constructing message batches (MessageSets) to transmit to brokers. A higher value allows larger and more effective (less overhead, improved compression) batches of messages to accumulate at the expense of increased message delivery latency. Type: float
message.send.max.retries	P	0 .. 2147483647	2147483647	high	How many times to retry sending a failing Message. Note: retrying may cause reordering unless `enable.idempotence` is set to true. Type: integer
retries	P	0 .. 2147483647	2147483647	high	Alias for `message.send.max.retries`: How many times to retry sending a failing Message. Note: retrying may cause reordering unless `enable.idempotence` is set to true. Type: integer
retry.backoff.ms	P	1 .. 300000	100	medium	The backoff time in milliseconds before retrying a protocol request. Type: integer
queue.buffering.backpressure.threshold	P	1 .. 1000000	1	low	The threshold of outstanding not yet transmitted broker requests needed to backpressure the producer's message accumulator. If the number of not yet transmitted requests equals or exceeds this number, produce request creation that would have otherwise been triggered (for example, in accordance with linger.ms) will be delayed. A lower number yields larger and more effective batches. A higher value can improve latency when using compression on slow machines. Type: integer
compression.codec	P	none, gzip, snappy, lz4, zstd	none	medium	compression codec to use for compressing message sets. This is the default value for all topics, may be overridden by the topic configuration property `compression.codec`. Type: enum value
compression.type	P	none, gzip, snappy, lz4, zstd	none	medium	Alias for `compression.codec`: compression codec to use for compressing message sets. This is the default value for all topics, may be overridden by the topic configuration property `compression.codec`. Type: enum value
batch.num.messages	P	1 .. 1000000	10000	medium	Maximum number of messages batched in one MessageSet. The total MessageSet size is also limited by batch.size and message.max.bytes. Type: integer
batch.size	P	1 .. 2147483647	1000000	medium	Maximum size (in bytes) of all messages batched in one MessageSet, including protocol framing overhead. This limit is applied after the first message has been added to the batch, regardless of the first message's size, this is to ensure that messages that exceed batch.size are produced. The total MessageSet size is also limited by batch.num.messages and message.max.bytes. Type: integer
delivery.report.only.error	P	true, false	false	low	Only provide delivery reports for failed messages. Type: boolean
dr_cb	P			low	Delivery report callback (set with rd_kafka_conf_set_dr_cb()) Type: see dedicated API
dr_msg_cb	P			low	Delivery report callback (set with rd_kafka_conf_set_dr_msg_cb()) Type: see dedicated API
sticky.partitioning.linger.ms	P	0 .. 900000	10	low	Delay in milliseconds to wait to assign new sticky partitions for each topic. By default, set to double the time of linger.ms. To disable sticky behavior, set to 0. This behavior affects messages with the key NULL in all cases, and messages with key lengths of zero when the consistent_random partitioner is in use. These messages would otherwise be assigned randomly. A higher value allows for more effective batching of these messages. Type: integer

Topic configuration properties

Property	C/P	Range	Default	Importance	Description
request.required.acks	P	-1 .. 1000	-1	high	This field indicates the number of acknowledgements the leader broker must receive from ISR brokers before responding to the request: 0=Broker does not send any response/ack to client, -1 or all=Broker will block until message is committed by all in sync replicas (ISRs). If there are less than `min.insync.replicas` (broker configuration) in the ISR set the produce request will fail. Type: integer
acks	P	-1 .. 1000	-1	high	Alias for `request.required.acks`: This field indicates the number of acknowledgements the leader broker must receive from ISR brokers before responding to the request: 0=Broker does not send any response/ack to client, -1 or all=Broker will block until message is committed by all in sync replicas (ISRs). If there are less than `min.insync.replicas` (broker configuration) in the ISR set the produce request will fail. Type: integer
request.timeout.ms	P	1 .. 900000	30000	medium	The ack timeout of the producer request in milliseconds. This value is only enforced by the broker and relies on `request.required.acks` being != 0. Type: integer
message.timeout.ms	P	0 .. 2147483647	300000	high	Local message timeout. This value is only enforced locally and limits the time a produced message waits for successful delivery. A time of 0 is infinite. This is the maximum time librdkafka may use to deliver a message (including retries). Delivery error occurs when either the retry count or the message timeout are exceeded. The message timeout is automatically adjusted to `transaction.timeout.ms` if `transactional.id` is configured. Type: integer
delivery.timeout.ms	P	0 .. 2147483647	300000	high	Alias for `message.timeout.ms`: Local message timeout. This value is only enforced locally and limits the time a produced message waits for successful delivery. A time of 0 is infinite. This is the maximum time librdkafka may use to deliver a message (including retries). Delivery error occurs when either the retry count or the message timeout are exceeded. The message timeout is automatically adjusted to `transaction.timeout.ms` if `transactional.id` is configured. Type: integer
queuing.strategy	P	fifo, lifo	fifo	low	EXPERIMENTAL: subject to change or removal. DEPRECATED Producer queuing strategy. FIFO preserves produce ordering, while LIFO prioritizes new messages. Type: enum value
produce.offset.report	P	true, false	false	low	DEPRECATED No longer used. Type: boolean
partitioner	P		consistent_random	high	Partitioner: `random` - random distribution, `consistent` - CRC32 hash of key (Empty and NULL keys are mapped to single partition), `consistent_random` - CRC32 hash of key (Empty and NULL keys are randomly partitioned), `murmur2` - Java Producer compatible Murmur2 hash of key (NULL keys are mapped to single partition), `murmur2_random` - Java Producer compatible Murmur2 hash of key (NULL keys are randomly partitioned. This is functionally equivalent to the default partitioner in the Java Producer.), `fnv1a` - FNV-1a hash of key (NULL keys are mapped to single partition), `fnv1a_random` - FNV-1a hash of key (NULL keys are randomly partitioned). Type: string
partitioner_cb	P			low	Custom partitioner callback (set with rd_kafka_topic_conf_set_partitioner_cb()) Type: see dedicated API
msg_order_cmp	P			low	EXPERIMENTAL: subject to change or removal. DEPRECATED Message queue ordering comparator (set with rd_kafka_topic_conf_set_msg_order_cmp()). Also see `queuing.strategy`. Type: see dedicated API
opaque	*			low	Application opaque (set with rd_kafka_topic_conf_set_opaque()) Type: see dedicated API
compression.codec	P	none, gzip, snappy, lz4, zstd, inherit	inherit	high	Compression codec to use for compressing message sets. inherit = inherit global compression.codec configuration. Type: enum value
compression.type	P	none, gzip, snappy, lz4, zstd	none	medium	Alias for `compression.codec`: compression codec to use for compressing message sets. This is the default value for all topics, may be overridden by the topic configuration property `compression.codec`. Type: enum value
compression.level	P	-1 .. 12	-1	medium	Compression level parameter for algorithm selected by configuration property `compression.codec`. Higher values will result in better compression at the cost of more CPU usage. Usable range is algorithm-dependent: [0-9] for gzip; [0-12] for lz4; only 0 for snappy; -1 = codec-dependent default compression level. Type: integer
auto.commit.enable	C	true, false	true	low	DEPRECATED [LEGACY PROPERTY: This property is used by the simple legacy consumer only. When using the high-level KafkaConsumer, the global `enable.auto.commit` property must be used instead]. If true, periodically commit offset of the last message handed to the application. This committed offset will be used when the process restarts to pick up where it left off. If false, the application will have to call `rd_kafka_offset_store()` to store an offset (optional). Offsets will be written to broker or local file according to offset.store.method. Type: boolean
enable.auto.commit	C	true, false	true	low	DEPRECATED Alias for `auto.commit.enable`: [LEGACY PROPERTY: This property is used by the simple legacy consumer only. When using the high-level KafkaConsumer, the global `enable.auto.commit` property must be used instead]. If true, periodically commit offset of the last message handed to the application. This committed offset will be used when the process restarts to pick up where it left off. If false, the application will have to call `rd_kafka_offset_store()` to store an offset (optional). Offsets will be written to broker or local file according to offset.store.method. Type: boolean
auto.commit.interval.ms	C	10 .. 86400000	60000	high	[LEGACY PROPERTY: This setting is used by the simple legacy consumer only. When using the high-level KafkaConsumer, the global `auto.commit.interval.ms` property must be used instead]. The frequency in milliseconds that the consumer offsets are committed (written) to offset storage. Type: integer
auto.offset.reset	C	smallest, earliest, beginning, largest, latest, end, error	largest	high	Action to take when there is no initial offset in offset store or the desired offset is out of range: 'smallest','earliest' - automatically reset the offset to the smallest offset, 'largest','latest' - automatically reset the offset to the largest offset, 'error' - trigger an error (ERR__AUTO_OFFSET_RESET) which is retrieved by consuming messages and checking 'message->err'. Type: enum value
offset.store.path	C		.	low	DEPRECATED Path to local file for storing offsets. If the path is a directory a filename will be automatically generated in that directory based on the topic and partition. File-based offset storage will be removed in a future version. Type: string
offset.store.sync.interval.ms	C	-1 .. 86400000	-1	low	DEPRECATED fsync() interval for the offset file, in milliseconds. Use -1 to disable syncing, and 0 for immediate sync after each write. File-based offset storage will be removed in a future version. Type: integer
offset.store.method	C	file, broker	broker	low	DEPRECATED Offset commit store method: 'file' - DEPRECATED: local file store (offset.store.path, et.al), 'broker' - broker commit store (requires "group.id" to be configured and Apache Kafka 0.8.2 or later on the broker.). Type: enum value
consume.callback.max.messages	C	0 .. 1000000	0	low	Maximum number of messages to dispatch in one `rd_kafka_consume_callback()` call (0 = unlimited) Type: integer*

C/P legend: C = Consumer, P = Producer, * = both

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