By default all the available cipher suites are supported. For SASL authentication, the principal will be derived using the rules defined by sasl.kerberos.principal.to.local.rules if GSSAPI is in use, and the SASL authentication ID for other mechanisms. Broker will use the control.plane.listener.name to locate the endpoint in listeners list, to listen for connections from the controller. By default there is no size limit only a time limit. This config determines the amount of time to wait before retrying. Only applicable for logs that are being compacted. The maximum connection creation rate we allow in the broker at any time. The desired minimum time for the login refresh thread to wait before refreshing a credential, in seconds. If the listener name is not a security protocol, listener.security.protocol.map must also be set. The create topic policy class that should be used for validation. In IaaS environments, this may need to be different from the interface to which the broker binds. The file format of the trust store file. Overview Azure Event Hubs provides an Apache Kafka endpoint on an event hub, which enables users to connect to the event hub using the Kafka protocol. If set to -1, no time limit is applied. With the default value for this config and ssl.enabled.protocols, clients will downgrade to TLSv1.2 if the server does not support TLSv1.3. key.serializer The length of time in milliseconds between broker heartbeats. The (optional) value in milliseconds for the maximum wait between login attempts to the external authentication provider. If the URL is HTTP(S)-based, the JWKS data will be retrieved from the OAuth/OIDC provider via the configured URL on broker startup. The number of threads that the server uses for processing requests, which may include disk I/O, The number of threads that the server uses for receiving requests from the network and sending responses to the network, The number of threads per data directory to be used for log recovery at startup and flushing at shutdown, The number of threads that can move replicas between log directories, which may include disk I/O. Tim Berglund Sr. Director, Developer Advocacy (Presenter) Kafka Brokers So far we have talked about events, topics, and partitions, but as of yet, we have not been too explicit about the actual computers in the picture. Setting this configuration to true allows the SASL authentication to attempt to perform authentication asynchronously. By default, we use an implementation that returns the leader. The upper bound (bytes/sec) on outbound replication traffic for leader replicas enumerated in the property leader.replication.throttled.replicas (for each topic). If this config is set to TLSv1.2, clients will not use TLSv1.3 even if it is one of the values in ssl.enabled.protocols and the server only supports TLSv1.3. The number of threads group metadata load / unload can use to concurrently load / unload metadata. Specify which version of the inter-broker protocol will be used. cleanup.policy Step 1: Generate our project Step 2: Publish/read messages from the Kafka topic Step 3: Configure Kafka through application.yml configuration file The old secret that was used for encoding dynamically configured passwords. Keystore type when using a client-side certificate with TLS connectivity to ZooKeeper. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM]. If this property is not specified, the Azure Block Blob client will use the DefaultAzureCredential to locate the credentials across several well-known locations. The Apache Kafka topic configuration parameters are organized by order of importance, ranked from high to low. Since at least one snapshot must exist before any logs can be deleted, this is a soft limit. Introduction to Apache Kafka on Azure Event Hubs - Azure Event Hubs Records are fetched in batches, and if the first record batch in the first non-empty partition of the fetch is larger than this value, the record batch will still be returned to ensure that progress can be made. For PLAINTEXT, the principal will be ANONYMOUS. Legal values are between 0 and 3600 (1 hour); a default value of 300 (5 minutes) is used if no value is specified. Specify if resource optimization detector is enabled. under the terms of the Apache License v2. The GCS region to use for tiered storage. The minimum allowed session timeout for registered consumers. This prefix will be added to tiered storage objects stored in the target Azure Block Blob Container. For example: 1@localhost:9092,2@localhost:9093,3@localhost:9094, Enables delete topic. This is not an absolute maximum, if the first record batch in the first non-empty partition of the fetch is larger than this value, the record batch will still be returned to ensure that progress can be made. This should not be set manually, instead Cluster Registry http apis should be used. Introduction Prerequisites Create Project Kafka Setup Configuration Create Topic Build Producer Build Consumer Produce Events Consume Events Where next? How to build your first Apache KafkaProducer application - Confluent When the available disk space is below the threshold value, the broker auto disables the effect oflog.deletion.max.segments.per.run and deletes all eligible segments during periodic retention. A list of cipher suites. The class of type org.apache.kafka.common.security.auth.SslEngineFactory to provide SSLEngine objects. Defaults to false if neither is set; when true, zookeeper.clientCnxnSocket must be set (typically to org.apache.zookeeper.ClientCnxnSocketNetty); other values to set may include zookeeper.ssl.cipher.suites, zookeeper.ssl.crl.enable, zookeeper.ssl.enabled.protocols, zookeeper.ssl.endpoint.identification.algorithm, zookeeper.ssl.keystore.location, zookeeper.ssl.keystore.password, zookeeper.ssl.keystore.type, zookeeper.ssl.ocsp.enable, zookeeper.ssl.protocol, zookeeper.ssl.truststore.location, zookeeper.ssl.truststore.password, zookeeper.ssl.truststore.type. The amount of buffer time before credential expiration to maintain when refreshing a credential, in seconds. Any later rules in the list are ignored. Typically set to org.apache.zookeeper.ClientCnxnSocketNetty when using TLS connectivity to ZooKeeper. Internal topic creation will fail until the cluster size meets this replication factor requirement. This value and sasl.login.refresh.min.period.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. This will add the telemetry reporter to the brokers metric.reporters property if it is not already present. Delete topic through the admin tool will have no effect if this config is turned off. Overrides any explicit value set via the zookeeper.ssl.ciphersuites system property (note the single word ciphersuites). Change broker configuration for kafka cluster on confluent cloud An explicit value overrides any value set via the same-named zookeeper.ssl.protocol system property. Kafka Listeners - Explained | Confluent The list of protocols enabled for SSL connections. This can be useful in some cases where external load balancers are used. Keystore password when using a client-side certificate with TLS connectivity to ZooKeeper. Acceptable values are ANY_UNEVEN_LOAD and EMPTY_BROKER. The fully qualified name of a SASL client callback handler class that implements the AuthenticateCallbackHandler interface. The Confluent DataBalancer will attempt to keep incoming data throughput below this limit. The transaction topic segment bytes should be kept relatively small in order to facilitate faster log compaction and cache loads. Batch size for reading from the transaction log segments when loading producer ids and transactions into the cache (soft-limit, overridden if records are too large). Kafka Broker Configurations for Confluent Platform The endpoint identification algorithm to validate server hostname using server certificate. It is an error to set this and inter.broker.listener.name properties at the same time. The frequency in milliseconds that the log cleaner checks whether any log is eligible for deletion. Please refer to AWS documentation for further information. Valid values are: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL. The broker will attempt to forcibly stop authentication that runs longer than this. The amount of time the group coordinator will wait for more consumers to join a new group before performing the first rebalance. If a client?s requested transaction time exceed this, then the broker will return an error in InitProducerIdRequest. It additionally accepts uncompressed which is equivalent to no compression; and producer which means retain the original compression codec set by the producer. Frequency at which tiered objects cleanup is run for deleted topics. Server callback handlers must be prefixed with listener prefix and SASL mechanism name in lower-case. The services that can be installed from this repository are: The number of queued requests allowed for data-plane, before blocking the network threads. Setting this flag will result in path-style access being forced for all requests. The class should implement the org.apache.kafka.server.policy.AlterConfigPolicy interface. The number of partitions for the transaction topic (should not change after deployment). -1 means that broker failures will not trigger balancing actions, Controls what causes the Confluent DataBalancer to start rebalance operations. To avoid connection storms, a randomization factor of 0.2 will be applied to the timeout resulting in a random range between 20% below and 20% above the computed value. The JWT will be inspected for the standard OAuth aud claim and if this value is set, the broker will match the value from JWTs aud claim to see if there is an exact match. Note that this configuration is ignored if an extension of KafkaPrincipalBuilder is provided by the principal.builder.class configuration. Getting Started with the KRaft Protocol - Confluent The override is disabled when set to 0. The maximum record batch size accepted by the broker is defined via message.max.bytes (broker config) or max.message.bytes (topic config). Only GSSAPI is enabled by default. Connections on the inter-broker listener are permitted even if broker-wide limit is reached. The SO_RCVBUF buffer of the socket server sockets. Disabling this property will prevent Self-balancing Clusters from working properly. A comma-separated list of listener names which may be started before the authorizer has finished initialization. Incorrect security.protocol configuration or broker version If you are using Kafka on Windows, you probably need to set it to true. Brokers and the clients both authenticate each other (2-way authentication). A listener should not appear in this list if it accepts external traffic. TLS, TLSv1.1, SSL, SSLv2 and SSLv3 may be supported in older JVMs, but their usage is discouraged due to known security vulnerabilities. This is required configuration when running in KRaft mode. The default value of null means the type will be auto-detected based on the filename extension of the truststore. The iteration count used for encoding dynamically configured passwords. The purge interval (in number of requests) of the delete records request purgatory. First you start up a Kafka cluster in KRaft mode, connect to a broker, create a topic, produce some messages, and consume them. In the latest message format version, records are always grouped into batches for efficiency. The default is TLSv1.2,TLSv1.3 when running with Java 11 or newer, TLSv1.2 otherwise. You can find code samples for the consumer in different languages in these guides. The metrics polling interval (in seconds) which can be used in kafka.metrics.reporters implementations. Valid values are between 0 and 1. The alter configs policy class that should be used for validation. Video courses covering Apache Kafka basics, advanced concepts, setup and use cases, and everything in between. The fully qualified class name that implements ReplicaSelector. Valid values are CLUSTER_LINK_ONLY and TOTAL_INBOUND. Truststore password when using TLS connectivity to ZooKeeper. ssl.keystore.location). The password for the trust store file. The format for the value is: loginModuleClass controlFlag (optionName=optionValue)*;. The upper bound (bytes/sec) on inbound replication traffic for follower replicas enumerated in the property follower.replication.throttled.replicas (for each topic). If the value is -1, the OS default will be used. Starting with Confluent Platform version 7.4, KRaft mode is the default for metadata management for new Kafka clusters. Frequency at which to check for stale offsets. The maximum size of a single metadata log file. A boolean value controlling whether to use incremental balancing strategy or not. Normally this is performed automatically by the client. The Confluent DataBalancer will attempt to keep incoming data throughput below this limit. A comma-separated list of the names of the listeners used by the controller. The name of the security provider used for SSL connections. This will ensure that the producer raises an exception if a majority of replicas do not receive a write. JAAS configuration file format is described here. This config specifies the maximum load for disk usage as a proportion of disk capacity. Currently applies only to OAUTHBEARER. The window of time a metrics sample is computed over. In Linux, you may also need to configure somaxconn and tcp_max_syn_backlog kernel parameters accordingly to make the configuration takes effect. Before each retry, the system needs time to recover from the state that caused the previous failure (Controller fail over, replica lag etc). Critical issue. The maximum amount of time the client will wait for the socket connection to be established. The Basics of Apache Kafka Brokers - Confluent Note that when the value is 0, there will be no delay before these records are removed. The default number of log partitions per topic. Copyright Confluent, Inc. 2014- By default, distinguished name of the X.500 certificate will be the principal. The number of milliseconds to keep a log file before deleting it (in milliseconds), If not set, the value in log.retention.minutes is used. Indicates whether to enable replicas not in the ISR set to be elected as leader as a last resort, even though doing so may result in data loss. The token validity time in miliseconds before the token needs to be renewed. The mode for cluster link quota that applies to confluent.cluster.link.io.max.bytes.per.second. If not set, the value in log.dir is used. The OAuth claim for the subject is often named sub, but this (optional) setting can provide a different name to use for the subject included in the JWT payloads claims if the OAuth/OIDC provider uses a different name for that claim. If not enough bytes, wait up to replica.fetch.wait.max.ms (broker config). It is suggested that the limit be kept above 1MB/s for accurate behaviour. document.write(new Date().getFullYear()); The URL can be HTTP(S)-based or file-based. Since this limit is enforced at the partition level, multiply it by the number of partitions to compute the topic hotset in bytes. The purge interval (in number of requests) of the fetch request purgatory. The GCS bucket to use for tiered storage. The JmxReporter is always included to register JMX statistics. The SSL protocol used to generate the SSLContext. The largest record batch size allowed by Kafka (after compression if compression is enabled). Percentage of random jitter added to the renewal time. Specify the message format version the broker will use to append messages to the logs. Default is GSSAPI. Examples of legal listener lists: PLAINTEXT://myhost:9092,SSL://:9091 CLIENT://0.0.0.0:9092,REPLICATION://localhost:9093, The directory in which the log data is kept (supplemental for log.dirs property). Used when running in KRaft mode. The amount of time to wait before attempting to retry a failed request to a given topic partition. A list of classes to use as metrics reporters. Log segments retained on broker-local storage is referred as the hotset. Setting this value incorrectly will cause consumers with older versions to break as they will receive messages with a format that they dont understand. If not specified, the GCS client will be instantiated using the default service account available. GSSAPI limits requests to 64K, but we allow upto 512KB by default for custom SASL mechanisms. For details on Kafka internals, see the free course on Apache Kafka Internal Architecture With Confluent Kafka docker images, we do not need to write the configuration files manually. To learn about running Kafka in KRaft mode, see Configure KRaft in Production. The maximum number of incremental fetch sessions that we will maintain. . For more about ZooKeeper, see Configure ZooKeeper for Production. Default SSL engine factory supports only PEM format with a list of X.509 certificates, Private key in the format specified by ssl.keystore.type. Default is PBKDF2WithHmacSHA512 if available and PBKDF2WithHmacSHA1 otherwise. This is optional for client. The Cipher algorithm used for encoding dynamically configured passwords. This configuration is only applicable for clusters in KRaft (Kafka Raft) mode (instead of ZooKeeper). confluent kafka broker describe 1 --config-name min.insync.replicas Describe the non-default cluster-wide broker configuration values. The maximum number of pending connections on the socket. Legal values are between 0.5 (50%) and 1.0 (100%) inclusive; a default value of 0.8 (80%) is used if no value is specified. personal data will be processed in accordance with our Privacy Policy. Default value is the trust manager factory algorithm configured for the Java Virtual Machine. Name of listener used for communication between brokers. If this is not configured, the configured inter-broker listener would be used. The maximum time a message will remain ineligible for compaction in the log. The default value of null means the enabled protocol will be the value of the zookeeper.ssl.protocol configuration property. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.class=com.example.CustomScramLogin. This is used by the broker to find the preferred read replica. Provides configuration options for plaintext, SSL, SASL_SSL, and Kerberos. For example to give a chroot path of /chroot/path you would give the connection string as hostname1:port1,hostname2:port2,hostname3:port3/chroot/path. Key store password is not supported for PEM format. If you are not using fully managed Apache Kafka in the Confluent Cloud, then this question on Kafka listener configuration comes up on Stack Overflow and such places a lot, so here's something to try and help.
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