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Further, when in read_committed the seekToEnd method will return the LSOstringread_uncommitted[read_committed, read_uncommitted]mediummax.poll.interval.msThe maximum delay between invocations of poll() when using consumer group management. This places an upper bound on the amount of time that the consumer can be idle before fetching more records. If poll() is not called before expiration of this timeout, then the consumer is considered failed and the group will rebalance in order to reassign the partitions to another member. int300000[1,...]mediummax.poll.recordsThe maximum number of records returned in a single call to poll().int500[1,...]mediumpartition.assignment.strategyThe class name of the partition assignment strategy that the client will use to distribute partition ownership amongst consumer instances when group management is usedlistclass org.apache.kafka.clients.consumer.RangeAssignororg.apache.kafka.common.config.ConfigDef$NonNullValidator@5622fdfmediumreceive.buffer.bytesThe size of the TCP receive buffer (SO_RCVBUF) to use when reading data. If the value is -1, the OS default will be used.int65536[-1,...]mediumrequest.timeout.msThe configuration controls the maximum amount of time the client will wait for the response of a request. If the response is not received before the timeout elapses the client will resend the request if necessary or fail the request if retries are exhausted.int30000[0,...]mediumsasl.client.callback.handler.classThe fully qualified name of a SASL client callback handler class that implements the AuthenticateCallbackHandler interface.classnullmediumsasl.jaas.configJAAS login context parameters for SASL connections in the format used by JAAS configuration files. JAAS configuration file format is described here. The format for the value is: 'loginModuleClass controlFlag (optionName=optionValue)*;'. For brokers, the config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.jaas.config=com.example.ScramLoginModule required;passwordnullmediumsasl.kerberos.service.nameThe Kerberos principal name that Kafka runs as. This can be defined either in Kafka's JAAS config or in Kafka's config.stringnullmediumsasl.login.callback.handler.classThe fully qualified name of a SASL login callback handler class that implements the AuthenticateCallbackHandler interface. For brokers, login callback handler config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.callback.handler.class=com.example.CustomScramLoginCallbackHandlerclassnullmediumsasl.login.classThe fully qualified name of a class that implements the Login interface. For brokers, login config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.class=com.example.CustomScramLoginclassnullmediumsasl.mechanismSASL mechanism used for client connections. This may be any mechanism for which a security provider is available. GSSAPI is the default mechanism.stringGSSAPImediumsecurity.protocolProtocol used to communicate with brokers. Valid values are: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL.stringPLAINTEXTmediumsend.buffer.bytesThe size of the TCP send buffer (SO_SNDBUF) to use when sending data. If the value is -1, the OS default will be used.int131072[-1,...]mediumssl.enabled.protocolsThe list of protocols enabled for SSL connections.listTLSv1.2,TLSv1.1,TLSv1mediumssl.keystore.typeThe file format of the key store file. This is optional for client.stringJKSmediumssl.protocolThe SSL protocol used to generate the SSLContext. Default setting is TLS, which is fine for most cases. Allowed values in recent JVMs are TLS, TLSv1.1 and TLSv1.2. SSL, SSLv2 and SSLv3 may be supported in older JVMs, but their usage is discouraged due to known security vulnerabilities.stringTLSmediumssl.providerThe name of the security provider used for SSL connections. Default value is the default security provider of the JVM.stringnullmediumssl.truststore.typeThe file format of the trust store file.stringJKSmediumauto.commit.interval.msThe frequency in milliseconds that the consumer offsets are auto-committed to Kafka if enable.auto.commit is set to true.int5000[0,...]lowcheck.crcsAutomatically check the CRC32 of the records consumed. This ensures no on-the-wire or on-disk corruption to the messages occurred. This check adds some overhead, so it may be disabled in cases seeking extreme performance.booleantruelowclient.idAn id string to pass to the server when making requests. The purpose of this is to be able to track the source of requests beyond just ip/port by allowing a logical application name to be included in server-side request logging.string""lowfetch.max.wait.msThe maximum amount of time the server will block before answering the fetch request if there isn't sufficient data to immediately satisfy the requirement given by fetch.min.bytes.int500[0,...]lowinterceptor.classesA list of classes to use as interceptors. Implementing the org.apache.kafka.clients.consumer.ConsumerInterceptor interface allows you to intercept (and possibly mutate) records received by the consumer. By default, there are no interceptors.list""org.apache.kafka.common.config.ConfigDef$NonNullValidator@4883b407lowmetadata.max.age.msThe period of time in milliseconds after which we force a refresh of metadata even if we haven't seen any partition leadership changes to proactively discover any new brokers or partitions.long300000[0,...]lowmetric.reportersA list of classes to use as metrics reporters. Implementing the org.apache.kafka.common.metrics.MetricsReporter interface allows plugging in classes that will be notified of new metric creation. The JmxReporter is always included to register JMX statistics.list""org.apache.kafka.common.config.ConfigDef$NonNullValidator@7d9d1a19lowmetrics.num.samplesThe number of samples maintained to compute metrics.int2[1,...]lowmetrics.recording.levelThe highest recording level for metrics.stringINFO[INFO, DEBUG]lowmetrics.sample.window.msThe window of time a metrics sample is computed over.long30000[0,...]lowreconnect.backoff.max.msThe maximum amount of time in milliseconds to wait when reconnecting to a broker that has repeatedly failed to connect. If provided, the backoff per host will increase exponentially for each consecutive connection failure, up to this maximum. After calculating the backoff increase, 20% random jitter is added to avoid connection storms.long1000[0,...]lowreconnect.backoff.msThe base amount of time to wait before attempting to reconnect to a given host. This avoids repeatedly connecting to a host in a tight loop. This backoff applies to all connection attempts by the client to a broker.long50[0,...]lowretry.backoff.msThe amount of time to wait before attempting to retry a failed request to a given topic partition. This avoids repeatedly sending requests in a tight loop under some failure scenarios.long100[0,...]lowsasl.kerberos.kinit.cmdKerberos kinit command path.string/usr/bin/kinitlowsasl.kerberos.min.time.before.reloginLogin thread sleep time between refresh attempts.long60000lowsasl.kerberos.ticket.renew.jitterPercentage of random jitter added to the renewal time.double0.05lowsasl.kerberos.ticket.renew.window.factorLogin thread will sleep until the specified window factor of time from last refresh to ticket's expiry has been reached, at which time it will try to renew the ticket.double0.8lowsasl.login.refresh.buffer.secondsThe amount of buffer time before credential expiration to maintain when refreshing a credential, in seconds. If a refresh would otherwise occur closer to expiration than the number of buffer seconds then the refresh will be moved up to maintain as much of the buffer time as possible. Legal values are between 0 and 3600 (1 hour); a default value of 300 (5 minutes) is used if no value is specified. This value and sasl.login.refresh.min.period.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.short300[0,...,3600]lowsasl.login.refresh.min.period.secondsThe desired minimum time for the login refresh thread to wait before refreshing a credential, in seconds. Legal values are between 0 and 900 (15 minutes); a default value of 60 (1 minute) is used if no value is specified. This value and sasl.login.refresh.buffer.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.short60[0,...,900]lowsasl.login.refresh.window.factorLogin refresh thread will sleep until the specified window factor relative to the credential's lifetime has been reached, at which time it will try to refresh the credential. 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. Currently applies only to OAUTHBEARER.double0.8[0.5,...,1.0]lowsasl.login.refresh.window.jitterThe maximum amount of random jitter relative to the credential's lifetime that is added to the login refresh thread's sleep time. Legal values are between 0 and 0.25 (25%) inclusive; a default value of 0.05 (5%) is used if no value is specified. Currently applies only to OAUTHBEARER.double0.05[0.0,...,0.25]lowssl.cipher.suitesA list of cipher suites. This 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. By default all the available cipher suites are supported.listnulllowssl.endpoint.identification.algorithmThe endpoint identification algorithm to validate server hostname using server certificate. stringhttpslowssl.keymanager.algorithmThe algorithm used by key manager factory for SSL connections. Default value is the key manager factory algorithm configured for the Java Virtual Machine.stringSunX509lowssl.secure.random.implementationThe SecureRandom PRNG implementation to use for SSL cryptography operations. stringnulllowssl.trustmanager.algorithmThe algorithm used by trust manager factory for SSL connections. Default value is the trust manager factory algorithm configured for the Java Virtual Machine.stringPKIXlow 3.4.2 Old Consumer Configs The essential old consumer configurations are the following: group.id zookeeper.connect Property Default Description group.id A string that uniquely identifies the group of consumer processes to which this consumer belongs. By setting the same group id multiple processes indicate that they are all part of the same consumer group. zookeeper.connect Specifies the ZooKeeper connection string in the form hostname:port where host and port are the host and port of a ZooKeeper server. To allow connecting through other ZooKeeper nodes when that ZooKeeper machine is down you can also specify multiple hosts in the form hostname1:port1,hostname2:port2,hostname3:port3. The server may also have a ZooKeeper chroot path as part of its ZooKeeper connection string which puts its data under some path in the global ZooKeeper namespace. If so the consumer should use the same chroot path in its connection string. 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. consumer.id null Generated automatically if not set. 153554b96e