In this post i will explain some different replication mechanism.
NOTE: A common drawback of replication, like it's defined in the specs, is that only HttpSession#setAttribute(...) triggers replication.
This means that if you store a container object in the session and if you change a variable inside the object, you must HttpSession#setAttribute(...) again to replicate the modified object again.
Many frameworks implements a simple workaround for it - i will write about it another post.
All to all replication / DeltaManager
With this mode, Tomcat just replicates the session to all registered nodes.
Pro:
- No single point of failure at software level
- Every node holds all sessions
- In theory, all other nodes can be turned off
- No extra software is needed
- Synchronous or Asynchronous replication
- Open Source
- Enterprise-Support available
- High memory usage and network traffic because all nodes holds all sessions
- Objects which are stored in the session must be triggered manually to replicate again if a property has been changed
- Slower session serialization
Primary/Secondary Replication (Buddy Replication) / BackupManager
The sessions will be replicated to the next neighbor. If one Tomcat is not available anymore, the neighbor still holds the sessions.
Pro:
- No single point of failure at software level
- Lower memory usage and network traffic because the session is not stored on all nodes
- No extra software is needed
- Synchronous or Asynchronous replication
- Open Source
- Enterprise-Support available
- Not quite as battle tested as the All-to-all replication (see Tomcat documentation)
- Objects which are stored in the session must be triggered manually to replicate again if a property has been change
- Slower session serialization
Memcached-session-manager
Each Tomcat replicates all sessions to N (multiple) Memcached nodes.
If a session is not available on the local Tomcat, the memcached-session-manager tries to lookup the session from the Memcached nodes.
Pro:
- No single point of failure at software level
- More scalability
- Session will be replicated to N “Memcached” nodes – The sessions are still available if all webservers are down
- Automatically handles “Memcached” nodes failover
- Sticky mode: Lower memory usage because every node holds only the current used sessions
- Non-Sticky mode: Lowest memory usage because Tomcat does not hold the sessions anymore. Session will be received from memcached for each request
- MSM will automatically trigger replication if a property in a session stored object has been changed
- Faster session serialization – Changeable mechanism
- Synchronous or Asynchronous replication
- Open Source
- Enterprise-Support available for Tomcat
- Extra software needed (“Memcached” plugin and nodes)
- Cannot switch to another Java Webserver which does not automatically check changed values in the session - but only if the used framework has no implemented workaround
- AFAIK no Enterprise-Support available for the Memcached plugin but Martin Grotzke is very active on the mailing list
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