Add properties filed for batch container

[wolfstudy]

Signed-off-by: xiaolongran [email protected]

Motivation

Currently, when we disable batch in Producer, in handleSend() of serverCnx.java, the msgMetadata.hasNumMessagesInBatch() is true and msgMetadata.getNumMessagesInBatch() is 1.

At this point, if we get the Properties object we set on the producer side on the broker side, the display is empty.

Go SDK set Properties:

// disable batch
producer, err := client.CreateProducer(pulsar.ProducerOptions{
	Topic: "topic-1",
	DisableBatching: true,
})

// set properties for every message
producer.Send(ctx, &pulsar.ProducerMessage{
	Payload: []byte(fmt.Sprintf("hello-%d", i)),
	Properties: map[string]string{
		"key-1": "value-1",
	},
});

Broker get message properties from entry metadata is null:

ByteBuf metadataAndPayload = entry.getDataBuffer();

MessageMetadata msgMetadata = Commands.peekMessageMetadata(metadataAndPayload, subscription.toString(), -1);

And msgMetadata.getPropertiesCount() <= 0.

Modifications

Add properties filed in Add single message to batchContainer