We begin by describing one simple approach to implementing the FUSE abstraction. Suppose every group member periodically pings every other group member with an “are you okay?” message. A group member that
is not okay for any reason, either because of node failure, network disconnect, network partition, or transient over- load, will fail to respond to some ping. The member that initiated this missed ping will ensure that a failure noti- fication propagates to the rest of the group by ceasing to respond itself to all pings for that FUSE group. Any in- dividual observation of a failure is thus converted into a group failure notification. This mechanism allows failure notifications to be delivered despite any pattern of discon- nections, partitions, or node failures. This specific FUSE implementation guarantees that failure notifications are propagated to every party within twice the periodic ping- ing interval. Our implementation uses a different liveness checking topology. It also uses a different ping retry policy; the retry policy and the guar- antees on failure notification latency
The name FUSE is derived from the analogy to “laying a fuse” between the group members. Whenever any group member wishes to signal failure it can light the fuse, and this failure notification will propagate to all other group members as the fuse burns. A connectivity failure or node crash at any intermediate location along the fuse will cause the fuse to be lit there as well, and the fuse will then start burning in every direction away from the failure. This ensures that communication failures will not stop the progress of the failure notification. Also, once the fuse has burnt, it cannot be relit, analogous to how the FUSE facility only notifies the application once per FUSE group.
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