A Lightweight Infrastructure for Reconfiguring Applications

We describe Lira, a lightweight infrastructure for managing dynamic reconfiguration that applies and extends the concepts of network management to component-based, distributed software systems. Lira is designed to perform both component-level reconfigurations and scalable applicationlevel reconfigurations, the former through agents associated with individual components and the latter through a hierarchy of managers. Agents are programmed on a component-by-component basis to respond to reconfiguration requests appropriate for that component. Managers embody the logic for monitoring the state of one or more components, and for determining when and how to execute reconfiguration activities. A simple protocol based on SNMP is used for communication among managers and agents. Report Documentation Page Form Approved OMB No. 0704-0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. 1. REPORT DATE DEC 2002 2. REPORT TYPE 3. DATES COVERED 4. TITLE AND SUBTITLE A Lightweight Infrastructure for Reconfiguring Applications 5a. CONTRACT NUMBER