Problems with Dubbo Service Group and version versions when registering for services

problem

Dubbo 2.5.3 version Use Group Group for registration with a bug, in the use of ZK registration or logoff, Dubbo is based on the name of the interface to create ZK node, did not set the grouping node and version node, in the cluster larger, grouped more cases, once the project registration or cancellation of more services, Dubbo will frequently read the same node (interface only), which causes ZK to have a large amount of repetitive output traffic, resulting in a rapid decline in the ability to deliver services. Solution

The fix is to register and look up the service, with a grouping of ZK nodes, so that you can pinpoint specific services instead of finding all the services below the interface. The following is the results of the testing of the test environment testing the validation data

The test material is as follows

Instance	Number of interfaces	Number of groups	Number of Dubbo Services
Service Side 4 Units	1	60	Single Register 60 Services
Consumption End 4 units	1	60	60 service for single station consumption

Comparison of test results before and after repair (PS: Flow monitoring using nload):
Initial start:

Number of servers started at the same time	ZK flow (before repair)	ZK traffic (after repair)	Flow duration (before repair)	Traffic duration (after repair)
1 Sets of providers	12mbit/s	0.3mbit/s	5s	5s
2 sets of providers	25mbit/s	0.3mbit/s	5s	5s
1 consumers	7mbit/s	0.4mbit/s	8s	5s
2 consumers	9mbit/s	0.4mbit/s	10s	10s

Restart the service side:

Start the number of services at the same time	logoff service when ZK traffic (before repair)	logoff service ZK traffic (after repair)	logoff service Time flow Duration (before)	logoff traffic duration (after)	registering service traffic (front)	registering service (after)	registering service traffic duration (pre	The traffic duration (after) when registering the service
1 service side	19mbit/s	1.1mbit/s	4s	1s	82mbit/s	1.1mbit/s	30s	1s
2 server	34mbit/s	1.5mbit/s	6s	1s /td>	110mbit/s	1.2mbit/s	180s	1s