2026-11-09T14:38:27.523646325Z main ERROR Reconfiguration failed: No configuration found for '2b4a2ec7' at 'null' in 'null'
This tool helps to read data from Kafka topics and outputs it to standard output.
Option                                   Description
------                                   -----------
--bootstrap-server <String: server to    REQUIRED: The server(s) to connect to.
  connect to>
--command-config <String: config file>   Consumer config properties file. Note
                                           that [command-property] takes
                                           precedence over this config.
--command-property <String:              Consumer config properties in the form
  consumer_prop>                           key=value.
--consumer-property <String:             (DEPRECATED) Consumer config
  consumer_prop>                           properties in the form key=value.
                                           This option will be removed in a
                                           future version. Use --command-
                                           property instead.
--consumer.config <String: config file>  (DEPRECATED) Consumer config
                                           properties file. Note that [command-
                                           property] takes precedence over this
                                           config. This option will be removed
                                           in a future version. Use --command-
                                           config instead.
--enable-systest-events                  Log lifecycle events of the consumer
                                           in addition to logging consumed
                                           messages. (This is specific for
                                           system tests.)
--formatter <String: class>              The name of a class to use for
                                           formatting kafka messages for
                                           display. (default: org.apache.kafka.
                                           tools.consumer.
                                           DefaultMessageFormatter)
--formatter-config <String: config       Config properties file to initialize
  file>                                    the message formatter. Note that
                                           [formatter-property] takes
                                           precedence over this config.
--formatter-property <String: prop>      The properties to initialize the
                                           message formatter. Default
                                           properties include:
                                          print.timestamp=true|false
                                          print.key=true|false
                                          print.offset=true|false
                                          print.epoch=true|false
                                          print.partition=true|false
                                          print.headers=true|false
                                          print.value=true|false
                                          key.separator=<key.separator>
                                          line.separator=<line.separator>
                                          headers.separator=<headers.separator>
                                          null.literal=<null.literal>
                                          key.deserializer=<key.deserializer>
                                          value.deserializer=<value.
                                           deserializer>
                                          header.deserializer=<header.
                                           deserializer>
                                         Users can also pass in customized
                                           properties for their formatter; more
                                           specifically, users can pass in
                                           properties keyed with 'key.
                                           deserializer.', 'value.
                                           deserializer.' and 'headers.
                                           deserializer.' prefixes to configure
                                           their deserializers.
--from-beginning                         If the consumer does not already have
                                           an established offset to consume
                                           from, start with the earliest
                                           message present in the log rather
                                           than the latest message.
--group <String: consumer group id>      The consumer group id of the consumer.
--help                                   Print usage information.
--include <String: Java regex (String)>  Regular expression specifying list of
                                           topics to include for consumption.
--isolation-level <String>               Set to read_committed in order to
                                           filter out transactional messages
                                           which are not committed. Set to
                                           read_uncommitted to read all
                                           messages. (default: read_uncommitted)
--key-deserializer <String:              The name of the class to use for
  deserializer for keys>                   deserializing keys.
--max-messages <Integer: num_messages>   The maximum number of messages to
                                           consume before exiting. If not set,
                                           consumption is continual.
--offset <String: consume offset>        The offset to consume from (a non-
                                           negative number), or 'earliest'
                                           which means from beginning, or
                                           'latest' which means from end
                                           (default: latest)
--partition <Integer: partition>         The partition to consume from.
                                           Consumption starts from the end of
                                           the partition unless '--offset' is
                                           specified.
--property <String: prop>                (DEPRECATED) The properties to
                                           initialize the message formatter.
                                           Default properties include:
                                          print.timestamp=true|false
                                          print.key=true|false
                                          print.offset=true|false
                                          print.epoch=true|false
                                          print.partition=true|false
                                          print.headers=true|false
                                          print.value=true|false
                                          key.separator=<key.separator>
                                          line.separator=<line.separator>
                                          headers.separator=<headers.separator>
                                          null.literal=<null.literal>
                                          key.deserializer=<key.deserializer>
                                          value.deserializer=<value.
                                           deserializer>
                                          header.deserializer=<header.
                                           deserializer>
                                         Users can also pass in customized
                                           properties for their formatter; more
                                           specifically, users can pass in
                                           properties keyed with 'key.
                                           deserializer.', 'value.
                                           deserializer.' and 'headers.
                                           deserializer.' prefixes to configure
                                           their deserializers.
                                         This option will be removed in a
                                           future version. Use --formatter-
                                           property instead.
--skip-message-on-error                  If there is an error when processing a
                                           message, skip it instead of halt.
--timeout-ms <Long: timeout_ms>          If specified, exit if no message is
                                           available for consumption for the
                                           specified interval.
--topic <String: topic>                  The topic to consume from.
--value-deserializer <String:            The name of the class to use for
  deserializer for values>                 deserializing values.
--version                                Display Kafka version.