Server connection capacity management
Dynamic management of concurrent client connections to a server is achieved by a server, in that the server monitors its load state and when the server's maximum permitted number of concurrent requests has been exceeded it reduces the clients' maximum numbers of permitted concurrent requests until such time as the overloading situation no longer persists. In this way, the capacity of each of multiple connections can be controlled by the server individually or as a group, wherein the control is dynamic, so that the client-server connections do not have to be accurately configured in advance.
1. A method for managing concurrent client connections to a transaction processing server, the method being performed by the server and comprising:
establishing a set of individual connections to a server, the individual connections being client-server connections;
maintaining each individual connection to the server wherein each individual connection is capable of transmitting a client request to the server and each connection is configured to support a certain number of concurrent requests, the certain number being a default, maximum permitted number;
processing a client request in a transaction processing component of the server;
issuing a response to the client request to an originating client;
monitoring in a connection capacity controller how many client-server connections are current;
recording in a log the certain number of concurrent requests permitted by a client-server connection;
monitoring in a server capacity monitor a loading of the server having regard to the certain number of concurrent requests the server is configured to support;
detecting in the server capacity monitor that the server is in an overloaded state;
issuing a command from the server capacity monitor to the connection capacity controller to reduce the certain number concurrent requests to a reduced number of concurrent requests;
transmitting from the connection capacity controller to at least one of the clients with a current client-server connection the reduced number of concurrent requests; and
responsive to the client-server connection operating with the reduced number of concurrent requests and the server capacity monitor detecting that the server has recovered from its overloaded state, the server capacity monitor issuing a command to the connection capacity controller to increase the reduced number of concurrent requests to a higher number of concurrent requests for the client-server connection.
2. The method of claim 1 , wherein the connection capacity controller rejects a client-server request received on the client-server connection when the client-server connection reaches the certain number of concurrent requests.
3. The method of claim 2 , wherein the connection capacity controller rejects a client request on the client-server connection when the client-server connection is operating with a reduced number of concurrent requests.
4. The method of claim 1 , wherein:
client requests for the server are queued in a queue when the server has no capacity to accept them, and
the server capacity monitor monitors loading of the server by monitoring a fill state of the queue.
5. The method of claim 1 , wherein the server capacity monitor monitors loading of the server by monitoring activity within the server.
6. The method of claim 1 , wherein the server capacity monitor monitors loading of the server by comparing how many client requests the server is processing with the certain number of concurrent requests.
7. The method of claim 1 , further comprising:
terminating the client-server connection to the server.