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Implement a per-exporter flow cache with active timeout expiration. Add columns "cache_active_timeout" and "cache_max_flows" into table "IPFIX" to configure each cache. Add per-flow elements "octetDeltaSumOfSquares", "minimumIpTotalLength", and "maximumIpTotalLength" to replace "ethernetTotalLength". Add per-flow element "flowEndReason" to indicate whether a flow has expired because of an active timeout, the cache size limit being reached, or the exporter being stopped. Signed-off-by: Romain Lenglet <rlenglet@vmware.com> Signed-off-by: Ben Pfaff <blp@nicira.com>