sijie opened a new issue #4642: producer#flush doesn't work as expected URL: https://github.com/apache/pulsar/issues/4642 **Describe the bug** The following code example should produce two message batches. but only one message batch is produced. ``` producer.sendAsync("message1"); producer.sendAsync("message2"); producer.flush(); producer.sendAsync("message3"); producer.sendAsync("message4"); producer.flush(); ``` **To Reproduce** Use the example code to reproduce **Expected behavior** When `flush` is triggered, it should flush out all the messages. **Additional context** The problem is due to following logic. if the connection is not connected, it doesn't send the batch. ``` private void processOpSendMsg(OpSendMsg op) { try { batchMessageContainer.clear(); pendingMessages.put(op); ClientCnx cnx = cnx(); if (isConnected()) { // If we do have a connection, the message is sent immediately, otherwise we'll try again once a new // connection is established op.cmd.retain(); cnx.ctx().channel().eventLoop().execute(WriteInEventLoopCallback.create(this, cnx, op)); stats.updateNumMsgsSent(op.numMessagesInBatch, op.batchSizeByte); } else { if (log.isDebugEnabled()) { log.debug("[{}] [{}] Connection is not ready -- sequenceId {}", topic, producerName, op.sequenceId); } } } catch (InterruptedException ie) { Thread.currentThread().interrupt(); semaphore.release(op.numMessagesInBatch); if (op != null) { op.callback.sendComplete(new PulsarClientException(ie)); } } catch (Throwable t) { semaphore.release(op.numMessagesInBatch); log.warn("[{}] [{}] error while closing out batch -- {}", topic, producerName, t); if (op != null) { op.callback.sendComplete(new PulsarClientException(t)); } } } ```
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