Recovery for Service-Oriented Applications

is -0533625 betty Salzberg salzberg@ccs.neu.eduNortheastern面向服务的应用程序的大学恢复本研究项目的目标是在现实环境中提供应用程序恢复。服务器软件称为SOA或面向服务的应用程序，它被实现为一个过程，并通过由应用程序方法组成的接口提供服务。客户端（终端客户端应用程序或另一个SOA）通过对应用程序方法的远程过程调用来使用SOAservice。许多关键任务的电子业务应用服务器都适合这个模型。恢复模式是分层的。最内层由共享内存（由服务器进程的不同线程共享的应用程序变量）组成。中间层称为服务域，由紧密耦合的soa组成。乐观日志记录在服务域中使用。乐观日志记录不会在预测消息之前将日志记录写入磁盘，因此开销很低。服务域外的通信使用悲观日志记录，在发送消息之前将日志记录写入磁盘。特殊结果日志记录用于与事务性系统（如dbms）通信。这项研究的结果将有助于为使用web服务的应用程序提供可用性。由于许多关键任务的电子业务应用服务器都符合此模型，因此本研究的最大价值在于提高这些服务器的可用性，从而提高依赖于这些服务器的应用程序的可用性。此外，该项目还将用于培养计算机科学博士。学生，目前是国家优先考虑的问题。这个项目的代码和手稿将通过项目网站http://www.ccs.neu.edu/home/salzberg/soa/发布

IIS-0533625Betty Salzberg salzberg@ccs.neu.eduNortheastern UniversityRecovery for Service-Oriented ApplicationsThe goal of this research project is to provide application recoveryin a realistic setting. The server software, called an SOA, orService-Oriented Application, is realized as a process and providesits service through an interface consisting of application methods. Aclient, either an end client application or another SOA, uses the SOAservice via remote procedure call to application methods. Manymission-critical electronic business application servers fit thismodel.The recovery model is tiered. The innermost tier consists of sharedmemory (application variables shared by the different threads of theserver process). The middle tier, called a service domain, consists oftightly-coupled SOAS. Optimistic logging is used within the servicedomain. Optimistic logging does not write log records to disk beforesending messages and is thus low-overhead. Communication outside theservice domain uses pessimistic logging, where log records are writtento disk before messages are sent. Special result logging is used tocommunicate with transactional systems such as DBMSs.The results of this research will help provide availability forapplications which use web services. Since many mission-criticalelectronic business application servers fit this model, the greatestimpact of this research will be in increasing availability for thoseservers and hence for the applications which depend on them. Inaddition, the project will be used in training of Computer SciencePh.D. students, currently a national priority. The code andmanuscripts for this project will be disseminated via the project website http://www.ccs.neu.edu/home/salzberg/soa/