Github user koeninger commented on the issue:
https://github.com/apache/spark/pull/17308
Just to throw in my two cents, a change like this is definitely needed, as
is made clear by the second sentence of the docs
http://kafka.apache.org/0102/javadoc/index.html?org/apache/kafka/clients/producer/KafkaProducer.html
"The producer is thread safe and sharing a single producer instance across
threads will generally be faster than having multiple instances."
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