Check CONTRIBUTING guideline first and here is the list to help us investigate the problem.

• fluentd or td-agent version.
  fluentd-0.14.20
• Environment information, e.g. OS.
  centos in docker machine
• Your configuration @type http port 8901 bind 0.0.0.0 body_size_limit 32m keepalive_timeout 10s add_remote_addr true

@type kafka_buffered brokers 192.168.1.1:9092 buffer_type file buffer_path /var/log/fluent/buffer-01/*.buffer

flush_interval 1s
buffer_chunk_limit 4m
buffer_queue_limit 43200

retry_wait 1s
max_retry_wait 60s
disable_retry_limit true

ruby-kafka producer options

max_send_retries 1
required_acks 1
compression_codec gzip
output_data_type json
output_include_time true
num_threads 1
#kafka_agg_max_bytes 1048576

# loglevel: trace, debug, info, warn, error log_level debug

• Your problem explanation. If you have an error logs, write it together.
  2018-02-06 09:44:21 +0000 [warn]: #0 Send exception occurred: data error
  2018-02-06 09:44:21 +0000 [warn]: #0 Exception Backtrace : /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/gzip_codec.rb:17:in close' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/gzip_codec.rb:17:incompress'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/compressor.rb:50:in block in compress_data' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/instrumenter.rb:21:ininstrument'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/compressor.rb:49:in compress_data' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/compressor.rb:34:incompress'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/produce_operation.rb:89:in block (2 levels) in send_buffered_messages' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/message_buffer.rb:44:inblock (2 levels) in each'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/message_buffer.rb:43:in each' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/message_buffer.rb:43:inblock in each'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/message_buffer.rb:42:in each' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/message_buffer.rb:42:ineach'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/produce_operation.rb:87:in block in send_buffered_messages' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/produce_operation.rb:81:ineach'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/produce_operation.rb:81:in send_buffered_messages' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/produce_operation.rb:47:inblock in execute'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/instrumenter.rb:21:in instrument' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/produce_operation.rb:41:inexecute'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/producer.rb:301:in block in deliver_messages_with_retries' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/producer.rb:293:inloop'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/producer.rb:293:in deliver_messages_with_retries' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/producer.rb:243:inblock in deliver_messages'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/instrumenter.rb:21:in instrument' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/ruby-kafka-0.4.0/lib/kafka/producer.rb:236:indeliver_messages'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/fluent-plugin-kafka-0.6.0/lib/fluent/plugin/out_kafka_buffered.rb:246:in deliver_messages' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/fluent-plugin-kafka-0.6.0/lib/fluent/plugin/out_kafka_buffered.rb:309:inwrite'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/fluentd-0.14.20/lib/fluent/compat/output.rb:131:in write' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/fluentd-0.14.20/lib/fluent/plugin/output.rb:1043:intry_flush'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/fluentd-0.14.20/lib/fluent/plugin/output.rb:1268:in flush_thread_run' /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/fluentd-0.14.20/lib/fluent/plugin/output.rb:420:inblock (2 levels) in start'
  /usr/local/rvm/gems/ruby-2.4.0@fluentd/gems/fluentd-0.14.20/lib/fluent/plugin_helper/thread.rb:78:in `block in thread_create'
  2018-02-06 09:44:21 +0000 [info]: #0 initialized kafka producer: kafka
  2018-02-06 09:44:21 +0000 [debug]: #0 taking back chunk for errors. chunk="5648805a66fd415d7ee306278c3d0f39"
  2018-02-06 09:44:21 +0000 [warn]: #0 failed to flush the buffer. retry_time=0 next_retry_seconds=2018-02-06 09:44:22 +0000 chunk="5648805a66fd415d7ee306278c3d0f39" error_class=Zlib::DataError error="data error"
  2018-02-06 09:44:21 +0000 [warn]: #0 suppressed same stacktrace
  2018-02-06 09:44:22 +0000 [warn]: #0 retry succeeded. chunk_id="5648805a66fd415d7ee306278c3d0f39"