Cache eviction messages

Guidewire does not guarantee the delivery of cache eviction messages in a PolicyCenter cluster. However, with that said, the following is true:

Message plugin type Notes

ClusterBroadcastTransportFactory It is unlikely for there to be a missed eviction message with this type of message transport as the message plugin reads the messages in order from the database. It is possible in extreme circumstances such as losing database connectivity for a time period longer than the configured cleaning interval for the broadcast table. However, it is not likely.

ClusterFastBroadcastTransportFactory If enabled, PolicyCenter typically uses this type of cluster transport for broadcasting cache eviction notices to cluster members. As this type of message transport uses UDP packets, it is possible to drop a UDP packet during transmission. Is is also possible for PolicyCenter to miss a packet if a garbage collection operation takes longer than the wait time for retransmitting a packet. If dropped packets become an issue, try setting the retransmitIntervals parameter on the plugin to a smaller value than its 10 second default value.

Message plugin type	Notes
`ClusterBroadcastTransportFactory`	It is unlikely for there to be a missed eviction message with this type of message transport as the message plugin reads the messages in order from the database. It is possible in extreme circumstances such as losing database connectivity for a time period longer than the configured cleaning interval for the broadcast table. However, it is not likely.
`ClusterFastBroadcastTransportFactory`	If enabled, PolicyCenter typically uses this type of cluster transport for broadcasting cache eviction notices to cluster members. As this type of message transport uses UDP packets, it is possible to drop a UDP packet during transmission. Is is also possible for PolicyCenter to miss a packet if a garbage collection operation takes longer than the wait time for retransmitting a packet. If dropped packets become an issue, try setting the `retransmitIntervals` parameter on the plugin to a smaller value than its 10 second default value.