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https://issues.apache.org/jira/browse/KAFKA-5187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16019332#comment-16019332
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Rajini Sivaram commented on KAFKA-5187:
---------------------------------------
{{Producer#send}} is asynchronous. If you want to wait for send to complete,
you can wait on the {{Future}} returned by {{send}}. That will also give you
the error if send fails. {{Producer#close}} waits for pending sends to
complete. Hence the timeout you are seeing is the send timing out.
> producer.close() times out at 30 seconds
> ----------------------------------------
>
> Key: KAFKA-5187
> URL: https://issues.apache.org/jira/browse/KAFKA-5187
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 0.10.1.1
> Reporter: Somnath Choudhuri
>
> In the code below, send() is successful and returns immediately. However
> producer.close() hangs and times out after 30 seconds.
> producer.send(new ProducerRecord<String, String>(topic, "0",
> "test string 0"));
> System.out.println("Send successful");
>
> long start_time = System.currentTimeMillis();
> producer.close();
> long end_time = System.currentTimeMillis();
>
> System.out.println("Time spent in closing Producer: " +
> (end_time - start_time));
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