CSR-AES Collaborative: Encore/J: Transparently Recoverable Java for Resilient Distributed Computing

EncoreJ项目正在开发用于透明重写Java代码的工具和库，使分布式Java应用程序在面对执行节点重新配置和故障时具有弹性。 开发人员控制系统，但EncoreJ会在加载包时自动重写编译的Java代码，增加对本地和远程对象的创建，访问和计算的支持，以及面对系统故障和重新配置的弹性。 Encore J还与各种持久性机制（例如，数据库），既用于提供基本的弹性（保存/恢复信息），又用于协调与外部数据库的机制的恢复。EncoreJ利用弹性支持来使得随着主机平台的发展而容易地重新配置应用，动态地添加和移除资源;例如，一个虚拟节点可能会关闭，并被另一个虚拟节点取代，以迫使工作转移到新的可用系统。 程序员描述“在一边”（不修改源代码），如何放置，移动和复制对象和计算;源代码仍然是清晰表达算法的主要机制，而没有硬编码的分布或弹性细节。EncoreJ工具和原型是更广泛的社区研究迁移，复制，调度等策略/算法的平台，在网格系统中。 Focus是一个方便灵活的平台，功能强大且可扩展，无需过度承诺任何特定的策略或策略。 EncoreJ建立在现成的标准系统（Java虚拟机和软件包）上，以确保广泛的适用性和易于分发和采用。该奖项是项目开发的种子资金。

The EncoreJ project is developing tools and libraries for transparent rewriting of Java code, making distributable Java applications resilient in the face of execution node reconfiguration and failure. Developers control the system, but EncoreJ automatically rewrites compiled Java code, as packages are loaded, adding support for creating, accessing, and computing upon local and remote objects, and for resilience in the face of system failures and reconfigurations. EncoreJ further interfaces with a variety of persistence mechanisms (e.g., databases), both for providing fundamental resilience (saving/restoring information) and for coordinating recovery with the mechanisms of the external database.EncoreJ exploits resiliency support to make it easy to reconfigure applications as the host platform evolves, adding and removing resources dynamically; e.g., a virtual node might go down and be replaced by another, in order to force work to move to a newly available system. Programmers describe "on the side" (without modifying source code), how to place, move, and replicate objects and computations; the source code remains the primary mechanism for expressing algorithms clearly without hard-coded details of distribution or resilience.The EncoreJ tools and prototype are a platform for research by the wider community working on policies/algorithms for migration, replication, scheduling, etc., in Grid systems. The focus is a convenient and flexible platform, powerful and extensible, without over-commitment to any particular policies or strategies. EncoreJ builds on readily available and standard systems (Java virtual machines and packages) to ensure wide applicability and easy distribution and adoption.This award is seed funding for project development.