In logstash 6.4.0 on MacOS and oracle jdk 1.8.0_181-b13，use the default setting for kafka output plugin start failed
[logstash.outputs.kafka ] Unable to create Kafka producer from given configuration {:kafka_error_message=>org.apache.kafka.common.config.ConfigException: Invalid value 32768 for configuration receive.buffer.bytes: Expected value to be a 32-bit integer, but it was a java.lang.Long, :cause=>nil}
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This should be fixed in the latest version (7.1.3) of the plugin
bin/logstash-plugin update logstash-output-kafka
Thank you
this should be documented as a known bug in the release notes and very soon (next monday) be fixed in logstash 6.4.1.
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just ran into this issue too with
#rpm -qa | grep logstash
logstash-6.4.0-1.noarch
and doing the /usr/share/logstash/bin/logstash-plugin update logstash-output-kafka
fixed it
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