Bottom-Up Fault Management in Composite Web Services - Advanced Information Systems Engineering - page 608

design complex [13]. Efforts have recently been made to add self-healing capabilities
to SOAs (e.g., [6]). However, these efforts mostly focus on monitoring service level
agreements and quality of service.
6 Conclusion
In this paper, we proposed a soft-state approach for managing bottom-up faults in
composite services. The approach includes techniques for fault detection, propaga-
tion, and reaction. We then focused on describing a fault propagation protocol. The
protocol inherits the advantages of the soft-state concept: implicit error recovery and
easier fault management resulting in high availability. A future extension of our pro-
tocol is to combine soft-state with hard-state signaling. For instance, if WS i provider
is scheduling a shut-down, SS-S i sends an explicit Shutdown() message to SS-R j ; this
allows SS-R j to differentiate between physical faults and status changes and hence,
detect status changes as soon as they occur. Another possible extension is to transmit
Refresh() reliably (e.g., via the use of ACK timers) and integrate a notification
mechanism through which receivers inform senders about their view (in terms of
failure) on those senders.
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