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，使可分发的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，但是EncoreJ在加载包时自动重写编译过的Java代码，增加了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时的弹性。EncoreJ进一步与各种持久性机制（例如，数据库）接口，既提供基本的弹性（保存/恢复信息），又与外部数据库的机制协调恢复。EncoreJ利用弹性支持，使得随着主机平台的发展，可以轻松地重新配置应用程序，动态地添加和删除资源；例如，一个虚拟节点可能会停机并被另一个虚拟节点取代，以迫使工作转移到一个新的可用系统上。程序员“在旁边”（不修改源代码）描述如何放置、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，没有硬编码的分布或弹性细节。EncoreJ工具和原型是一个供更广泛的社区研究网格系统中迁移、复制、调度等策略/算法的平台。重点是一个方便和灵活的平台，强大和可扩展，没有过度承诺任何特定的策略或策略。EncoreJ构建在现成的标准系统（Java虚拟机和包）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基金。

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.