Refactored and streamlined of cluster infrastructure
- base the API new new cluster infrastructure (including memoize-flush, server_cluster_peer_hosts, etc.) - improved handling for multiple IP addresses and IPv6 - removed assumptions of local vs. global network drivers - server_cluster_httpget_from_peers not used anymore
Provide a default timeout of 5m to all ns_cache besed caches created via the acs-cache infrastructure
Background: in case, a db entry is to be cached, where the db query does not finish (e.g. runs into a deadlock), subsequent attempts for the same value will be blocked as well by the mutex protecting the entry to be cached. Therefore, later requests to this entry might queue up in the server. By providing a timeout, this mutex will terminate latest when the timeout is reached.
The default value for the timeout is set to 5m. In case a certain cache might issue requests running longer than this, the cache has to be configured with a larger timeout value.
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