dubbo:protocol

dubbo:protocol element

Service provider protocol configuration. The corresponding class is org.apache.dubbo.config.ProtocolConfig. If you need to support multiple protocols, you could declare multiple <dubbo:protocol> tags, and specify the protocol via protocol property.

Attribute	Corresponding URL parameter	Type	Required	Default Value	Function	Description	Compatibility
id		string	False	dubbo	Configuration association	Bean Id of the protocol, can be referenced in <dubbo:service protocol=""> The default value is equal to the value of `name` attribute while `id` is not filled. If `name` value has already existed, it will add index to it’s suffix.	Above 2.0.5
name	<protocol>	string	True	dubbo	Performance optimize	Protocol name	Above 2.0.5
port	<port>	int	False	The default port of dubbo protocol is 20880, rmi protocol is 1099, http and hessian protocol are 80；It will allocate the default port if `port` is not filled; It will allocate an unused port if `port` equals `-1`. To ensure the ports scope is controllable, the port will increase based on the corresponding protocol default port after Dubbo 2.4.0+	Service discovery	Service port	Above 2.0.5
host	<host>	string	False	Find local IP automatically	Service discovery	-The host name of services, to specify VIP and domain, or having multiple network cards. If null, it will find local IP automatically- It’s recommended to let Dubbo find local IP automatically	Above 2.0.5
threadpool	threadpool	string	False	fixed	Performance optimize	The type of Thread Pool, fixed/cached are available	Above 2.0.5
threads	threads	int	False	200	Performance optimize	The size of the services’ Thread Pool(Fixed)	Above 2.0.5
iothreads	threads	int	False	The count of CPU + 1	Performance optimize	The size of io Thread Pool(Fixed)	Above 2.0.5
accepts	accepts	int	False	0	Performance optimize	The maximum connection count of the service provider	Above 2.0.5
payload	payload	int	False	8388608(=8M)	Performance optimize	The length limit of request and response, unit is byte	Above 2.0.5
codec	codec	string	False	dubbo	Performance optimize	Protocol encoding	Above 2.0.5
serialization	serialization	string	False	The default serialization of dubbo protocol is hessian2, rmi protocol is java, http protocol is json	Performance optimize	Protocol serialization, It’s used when a protocol has multiple serializations. For example, `dubbo` protocol has 4 serializations, they are `dubbo`, `hessian2`, `java` and `compactedjava`.	Above 2.0.5
accesslog	accesslog	string/boolean	False		Service discovery	`true` will write access log to logger. Specifying it to a log path, you can write access logs to special log file.	Above 2.0.5
path	<path>	string	False		Service discovery	Context path, the prefix of the service path	Above 2.0.5
transporter	transporter	string	False	The default value of dubbo protocol is netty	Performance optimize	The server and client implements of the protocol. For example, mina and netty for dubbo protocol. You can configure server or client side separately.	Above 2.0.5
server	server	string	False	The default value of dubbo protocol is netty, http protocol is servlet	Performance optimize	The server implement of the protocol. For example, mina and netty for dubbo ptotocol, jetty and servlet for http protocol.	Above 2.0.5
client	client	string	False	The default value of dubbo protocol is netty	Performance optimize	The client implement of the protocol. For example, mina and netty for dubbo protocol.	Above 2.0.5
dispatcher	dispatcher	string	False	The default value of dubbo protocol is all	Performance optimize	specify the thread model of the way to dispatching. Such as `all`, `direct`, `message`, `execution`, and `connection` for dubbo protocol.	Above 2.1.0
queues	queues	int	False	0	Performance optimize	The queue size of the Thread Pool. It’s recommended not to specify it in order to invoke other provides rather than queueing unless you have special requirement.	Above 2.0.5
charset	charset	string	False	UTF-8	Performance optimize	Serialization encoding	Above 2.0.5
buffer	buffer	int	False	8192	Performance optimize	The buffer size of networking IO	Above 2.0.5
heartbeat	heartbeat	int	False	0	Performance optimize	Heartbeat interval. For long connection, it’s difficult to receive closing event while the physical layer is disconnected. So heartbeat is necessary to help checking the connection quality	Above 2.0.10
telnet	telnet	string	False		Service discovery	Supported telnet commands, use `,` to separate commands.	Above 2.0.5
register	register	boolean	False	true	Service discovery	Whether registering the corresponding services to registry center	Above 2.0.8
contextpath	contextpath	String	False	Default value is an empty string	Service discovery		Above 2.0.6

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