chetanmeh commented on issue #4717: Kafka Ver. 0.11.0.1 uses OracleJDK URL: https://github.com/apache/openwhisk/issues/4717#issuecomment-569511329 > What happens if I run java -jar openwhisk-standalone.jar without '--kafka' switch? Then OpenWhisk runs in [lean mode][1] (#4216) without Kafka. With `--kafka` it uses [embedded kafka][2]. See #4628 for details on what all was done for this mode. Note that it uses Kafka 2.1.1. So basic stuff works as expected with this Kafka version. To make standalone connect to existing running Kafka would need some work as current approach was implemented with embedded mode and has to adapt the listeners to workaround the Docker networking. May be try launching Standalone without `--kafka` switch and instead set following system properties ``` -Dwhisk-config.kafka.hosts=localhost:9093 -Dwhisk.spi.MessagingProvider=org.apache.openwhisk.connector.kafka.KafkaMessagingProvider -Dwhisk.spi.LoadBalancerProvider=org.apache.openwhisk.standalone.KafkaAwareLeanBalancer ``` Change the port as per your setup. I have not tried it so cannot comment if it works as expected! [1]: https://medium.com/openwhisk/lean-openwhisk-open-source-faas-for-edge-computing-fb823c6bbb9b [2]: https://github.com/embeddedkafka/embedded-kafka
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