关键词: 迁移工作流, 迁移实例, 监控, 恢复

Abstract: Migrating workflow is a workflow model with multi-executors working simultaneously and collaboratively.Migrating instances are susceptible to exterior environment and interior status since the characteristics of self-recognize and self-coordinate.The exception detector and fault recovery is key to guarantee the reliability.However，existing monitoring and processing scheme cannot provide effective measures.To solve above problems，a fault recovery scheme of migrating instances based on hierarchical monitoring model is presented based on the background of migrating workflow model.The scheme can monitor the execution status of migrating instances and implement consistent recovery when a migrating instance fails.The elementary experiments show that the scheme not only can monitor executing agents with collaborating actions effectively，but also can recover to a consistent system status.

Key words: migrating workflow, migrating instance, monitor, recovery