On the Challenges in Event Delivery
نویسندگان
چکیده
Complex Event Processing systems are dependent upon the collection of events from distributed systems. Without a dependent mechanism for event delivery, the inferencing of complex events is hampered and the reliability of the system quickly deteriorates. Determining the right method for collecting events may have a significant impact on system performance and resource utilization and therefore the design of event delivery mechanism should be done with care. As an example, consider the growing use of RSS feeds. A client can customize the rate of monitoring RSS feeds. The RSS 2.0 specification ([3]) also allows servers to specify some server capabilities, such as Time-To-Live (TTL) (specified by the XML tag), indicating when an RSS feed is expected to be refreshed by the server. The RSS 2.0 specification also allows servers to use XML tags such as that provides instructions for clients to skip probing the server during specified hours of the day, e.g., whenever a server is expected to be in maintenance, and therefore, a client probe would yield an old version of the RSS file from the server’s cache. The RSS 2.0 specification further supports a mechanism named RSS Clouds (specified by the XML tag ). Using the cloud mechanism a client can register a callback service method that the server can use in order to notify the client when the RSS feed gets updated. Upon notification, the client is still required to pull the RSS feed data from the server and filter data from the RSS feed. With the lack of a service level agreement (SLA) between the client and the server, there is no way the server can guarantee an upper bound on the delay of its notifications to the client. With the Google Alerts1 service a client can register to Web resources, e.g., RSS feeds and HTML files. The client can request to be notified as soon as an event occurs, yet there are no guarantees regarding the delay in notification. A more common way nowadays for accessing RSS feeds is using a feed aggregation client application that pulls the
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