This setting indicates to the Session Reaper how aggressively it must work. ![]() This length of the reaping cycle is specified by the coherence-reaperdaemon-cycle-seconds context parameter. The Session Reaper is configured to scan the entire set of sessions over a certain period, called a reaping cycle, which defaults to five minutes. During this time, only its own sessions are reaped. ![]() Also, the reaping ownership does not circulate over the nodes in the cluster in a controlled way one node can be the reaping node for a long time before it is taken over by another node. This means that it will take longer for sessions to be reaped as more nodes are added to the cluster. Because only one server at a time performs the reaping, sessions owned by other nodes cannot be reaped. The coherence-reaperdaemon-cluster-coordinated context parameter should not be used if sticky optimization ( coherence-sticky-sessions) is also enabled. The coherence-reaperdaemon-cluster-coordinated context parameter causes the cluster to coordinate reaping so that only one server at a time performs the actual reaping the use of this option is not suggested, and it cannot be used with the Coherence*Web over Coherence*Extend topology. That means that if Coherence is configured to provide a separate cache tier (made up of cache servers), then the Session Reaper does not run on those cache servers.īy default, the Session Reaper runs concurrently on all of the application servers, so that all of the servers share the workload of identifying and cleaning up expired sessions. The Coherence*Web Session Reaper scans for sessions that have expired, and when it finds expired sessions it destroys them.Įvery application server running Coherence*Web runs the Session Reaper. Session expiration is passiveâoccurring only due to the passing of time. As long as requests continue to arrive related to that session, it is kept active, but when a period of inactivity occurs longer than that specified by the MaxInactiveInterval property, then the session expires. The MaxInactiveInterval property defaults to the value configured for Coherence*Web, but it can be modified on a session-by-session basis.Įach time that an HTTP request is received by the server, if there is an HTTP session associated with that request, then the LastAccessedTime property of the session is automatically updated to the current time. The second is the MaxInactiveInterval property of the session, which specifies how long the session is kept active without any activity a typical value for this property is 30 minutes. The first is the LastAccessedTime property of the session, which is the time stamp of the most recent activity involving the session. The Session Reaper provides a service similar to the JVM Garbage Collection (GC) capability: the Session Reaper is responsible for destroying any session that is no longer used, which is determined by when that session has timed out.Įach HTTP session contains two pieces of information that determine when it has timed out. Understanding Session Invalidation Exceptions for the Session ReaperĪs part of Coherence*Web Session Management Module, HTTP sessions that have expired are eventually cleaned up by the Session Reaper. Getting Session Reaper Performance Statistics This chapter contains the following sections: The Session Reaper is responsible for destroying any session that is no longer used, which is determined by when that session has timed out. This chapter describes how to configure and use the Session Reaper.
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