Node Recycling Mode
Recycling mode is Node's Advanced setting that controls how Sentinet Node restarts its hosted virtual services when they change. There are two recycling modes available:
Service Isolation mode -- this is the default configuration settings. In this mode Sentinet Node restarts only those virtual services that changed since the last Node's heartbeat. This may introduce few milliseconds delay in a virtual service availability while it is restarted.
Node recycling mode. In this mode, the Sentinet Node restarts the IIS Application Pool in which it runs, causing all Node's virtual services to be restarted, including those virtual services that have not been changed since the last heartbeat. The advantage of this recycling mode is that it will not introduce any delays in the availability of any of the hosted virtual services, despite the fact that all virtual services are restarted. This benefit is provided by the combination of how Microsoft IIS server and IIS Application Pools work together. A closing instance of an IIS Application Pool can gracefully finish processing all its in-flight messages while a new instance of the IIS Application Pool starts accepting all new messages. The disadvantage of this mode is that it may cancel existing message-level sessions for those virtual SOAP services that are session-full and are not meant to be disrupted by the changes of some other virtual services.
