jiafu1115 commented on PR #20842:
URL: https://github.com/apache/kafka/pull/20842#issuecomment-3507756076
Attach the test result:
Send the same message to the same topic
```
//No preload metadata
long startTime = System.currentTimeMillis();
Future<RecordMetadata> future = producer.send(record);
System.out.println("take " + (System.currentTimeMillis() - startTime ) +
"ms" );
```
take 3053ms
```
//Preload the metadata
long startTime = System.currentTimeMillis();
producer.partitionsFor(topic);
System.out.println("take " + (System.currentTimeMillis() - startTime ) + "ms
to warmup" );
startTime = System.currentTimeMillis();
Future<RecordMetadata> future = producer.send(record);
System.out.println("take " + (System.currentTimeMillis() - startTime ) + "ms
to sent" );
```
take 3137ms to warmup
take 46ms to sent
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