leiless commented on issue #10832:
URL: https://github.com/apache/pulsar/issues/10832#issuecomment-858341525
Code example
```java
List<CompletableFuture<MessageId>> sendFutureList =
Lists.newArrayList();
for (int i = 0; i < numMsgs; i++) {
byte[] message = ("msg-" + i).getBytes();
sendFutureList.add(producer.sendAsync(message));
if ((i + 1) % numMsgsInBatch == 0) {
producer.flush();
LOG.info("Flush {} messages", (i + 1));
}
}
FutureUtil.waitForAll(sendFutureList).get();
```
https://github.com/apache/pulsar/blob/master/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/BatchMessageTest.java#L340-L349
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