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Adaptable Object Migration: Concept and Implementation

机译：适应性对象迁移：概念和实现

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摘要

Migration is one example of the insufficiently used potentials of distributed systems. Although migration can enhance the efficiency and the reliability of distributed systems, it is still rarely used. Two limitations contained in nearly all existing migration implementations prevent a widespread usage: migration is restricted to processes and the migration mechanism, i.e. the way state is transferred, is not adaptable to changing requirements. In our approach, migration is an operation provided by every object of any type. Triggered by higher level migration policies, the object migrates itself using an object-specific migration mechanism. Changing requirements are handled by higher level migration policies that adapt migration by exchanging the object's mechanisms. Adaptable migration was implemented within the BirliX operating system. Different migration mechanisms are accomplished by different meta objects, which can be attached to other objects. If an object has to be migrated, the meta object does the migration. Changing environmental requirements are handled by exchanging the meta object. As a result, each object has its own migration mechanism. The approach has been examined by implementing a couple of well-known migration mechanisms via meta objects. This paper describes the meta object implementation of the Charlotte migration mechanism.
机译：迁移是分布式系统潜力不足的一个例子。尽管迁移可以提高分布式系统的效率和可靠性，但仍然很少使用。几乎所有现有的迁移实现中都包含两个限制，无法广泛使用：迁移仅限于流程，并且迁移机制（即状态转移的方式）不适应不断变化的需求。在我们的方法中，迁移是任何类型的每个对象提供的操作。由更高级别的迁移策略触发，对象使用特定于对象的迁移机制进行自身迁移。不断变化的需求由更高级别的迁移策略处理，这些策略通过交换对象的机制来适应迁移。可适应的迁移是在BirliX操作系统中实现的。不同的迁移机制由不同的元对象完成，这些元对象可以附加到其他对象。如果必须迁移对象，则元对象将进行迁移。通过交换元对象来处理不断变化的环境要求。结果，每个对象都有其自己的迁移机制。该方法已通过通过元对象实现几个众所周知的迁移机制进行了检验。本文介绍了Charlotte迁移机制的元对象实现。

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