摘要:
A method, system and program product maintains consistency of data across a hierarchy of caches. Under the present invention, each data entry in the hierarchy of caches is assigned its own dependency identifier as well as the dependency identifiers of any data entries on which it depends. Thus, the present invention allows corresponding data entries to be linked for automatic invalidation.
摘要:
A method, system and apparatus for on-demand application resource allocation. In accordance with the method of the invention, an anticipated workload can be compared to a measured capacity for an application cluster in one or more server computing nodes in a server farm. If the measured capacity warrants a re-configuration of the application clusters, a new placement can be computed for application server instances in individual ones of the server computing nodes. Subsequently, the new placement can be applied to the server computing nodes in the server farm. In this regard, the applying step can include starting and stopping selected ones of the application server instances in different ones of the server computing nodes to effectuate the new placement.
摘要:
A method and apparatus route hypertext protocol requests to one of a plurality of application servers, which share a database through a backend database management system. The application servers store session data in the database. Hence, if a subsequent request is routed to a different application server, the session data is available through the backend database management system. One or more web servers perform routing of requests to the application server. When a request is received that is accompanied by a session ID, routing is performed by utilizing a hash function on the session ID. The resulting hash value is mapped to an application server. A hash function on a session ID will always result in the same hash value; therefore, the request will always be routed to the same application server. However, if an application server is non-functional, a new hash based on the previous hash is computed until a functional application server is selected.
摘要:
The present invention provides a method, system, and computer program product for supporting a large number of intermittently used application clusters without consuming all the resources needed to run server processes for all the application clusters all the time. A method in accordance with the present invention comprises: holding an application request for a dormant application cluster in a holding zone; changing a status of the dormant application cluster to active; changing a status of an unused active application cluster to dormant; stopping server processes for the newly dormant application cluster; starting server processes for the newly active application cluster; and directing the application request held in the holding zone to the server processes for the newly active application cluster.
摘要:
A method and apparatus route hypertext protocol requests to one of a plurality of application servers, which share a database through a backend database management system. The application servers store session data in the database. Hence, if a subsequent request is routed to a different application server, the session data is available through the backend database management system. One or more web servers perform routing of requests to the application server. When a request is received that is accompanied by a session ID, routing is performed by utilizing a hash function on the session ID. The resulting hash value is mapped to an application server. A hash function on a session ID will always result in the same hash value; therefore, the request will always be routed to the same application server. However, if an application server is non-functional, a new hash based on the previous hash is computed until a functional application server is selected.
摘要:
Controlling a cache of distributed data is provided by dynamically determining whether and/or where to cache the distributed data based on characteristics of the data, characteristics of the source of the data and characteristics of the cache so as to provide an indication of whether to cache the data. The data may be selectively cached based on the indication.
摘要:
A method, system, and computer program product, by which portions of the session information that page-content is dependent upon are “pushed” to the client from the origin server in a way such that auxiliary servers, e.g. other application servers and edge-servers, have access to the session information and fragment dependancy data to generate auxiliary-server cache-IDs for the custom pages. This enables distribution of the load away from the origin server, allowing better application distribution and scalability through more effective caching.
摘要:
A method, system, and computer program product, by which portions of the session information that page-content is dependent upon are “pushed” to the client from the origin server in a way such that auxiliary servers, e.g. other application servers and edge-servers, have access to the session information and fragment dependancy data to generate auxiliary-server cache-IDs for the custom pages. This enables distribution of the load away from the origin server, allowing better application distribution and scalability through more effective caching.
摘要:
A method, system, and computer program product, by which portions of the session information that page-content is dependent upon are “pushed” to the client from the origin server in a way such that auxiliary servers, e.g. other application servers and edge-servers, have access to the session information and fragment dependancy data to generate auxiliary-server cache-IDs for the custom pages. This enables distribution of the load away from the origin server, allowing better application distribution and scalability through more effective caching.
摘要:
Methods, systems, computer program products, and methods of doing business by caching dynamic content fragments in a distributed cache and assembling requested content using these fragments. The disclosed techniques are non-invasive, and enable the benefits of distributed fragment caching to be extended to more applications, without regard to the programming model used when designing the application. An application developer specifies dependencies among content creating components (or, in alternative embodiments, it may be possible to infer this information), and if one of these components may be called upon to generate a content fragment dynamically, correlator data is programmatically created and attached to a message that references the component. A subsequent content generation request to the component then automatically carries the correlator data, and that data is programmatically restored.