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Resin Application Server
                        Paul Cowan - InfoQ
                             Interview
Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
InfoQ - Paul Cowan Discusses the Resin
                  Application Server and Cloud
Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
About Paul Cowan
     • Software Engineer working on the Resin
          application server at Caucho Technology

     • Focusing on dependency injection,
          concurrency, high-speed messaging, and
          distributed caching

     • 11 years of experience
          • Started with NetDynamics
          • Prior to Caucho worked as Senior Architect
                with NAVTEQ
                • Traffic.com division


Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“Where do you see Resin
              in terms of the wider
                Cloud landscape?”



Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Resin and the Cloud
                     Landscape
     • Resin fits on the elastic JEE application layer
     • We don’t sell the service or provide it to you
          • Not PaaS
          • Not SaaS
     • We are a infrastructure provider/vendor
          • You get the Resin software
          • You build your Cloud on it




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“Can you tell us a little bit
          about how your Cloud
         support is architected?”



Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Resin Cloud Support
                         Architected
     • Triad hub-and-spoke
          architecture

     • Hub
          • Three Primary Servers
                • Constantly
                    communicating with
                    each other

     • Spoke
          • Elastic Spoke Servers
                • Add or Remove as


Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“Why did you go for a
           hub-and-spoke rather
          than say a peer-to-peer
                 cluster?”

Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Hub-and-Spoke vs. Peer-
                to-Peer
     • Most cases easier to have 3 primary servers
          • IP addresses are known
                • No need for auto-discovery
                    • Creates problems in EC2 environments

     • Hub architecture with 3 primary servers
          • Responsible for caching data
          • Maintaining the knowledge of Cloud architecture
          • Eliminates a lot of issues you get with true peer-to-
                peer network




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Basic Hub-and-Spoke
                          Configuration

                                                                     Dynamic&&
                                                                      Spoke&
                                                                      Server&
                   Triad&                  Triad&
                                                                        A&
                  Server&                 Server&
                     1&                      2&


                               Triad&
                              Server&                                Dynamic&&
                                 3&                                   Spoke&
                                                                      Server&
                                                                        B&




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Basic Hub-and-Spoke
                          Configuration
                                                                                             Load(increases.(
                                                                                             Spin(a(new(server((
                                                                     Dynamic&&   Dynamic((   up(
                                                                      Spoke&      Spoke(
                                                                      Server&     Server(
                   Triad&                  Triad&
                                                                        A&          C(
                  Server&                 Server&
                     1&                      2&


                               Triad&
                              Server&                                Dynamic&&
                                 3&                                   Spoke&
                                                                      Server&
                                                                        B&




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“How do you keep the network
       traffic to a reasonable level as
       the number of spikes grows?”




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Keeping Network Traffic at
         Reasonable Level as Spikes
                        Grow
     • Messaging based on Hessian Network Protocol
          (HMTP)

     • During distributed sessions
          • Only update your session data when the data
                changes
          •     Hashing session
                • Triad master will have a hash of what current data is
          • Spoke server verifies latest data
                • “Here is my hash, do I have the latest data?”
                • If hashes match very little data needs to be sent


Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
New Server Dynamically Joining
                     Cloud



                                                            Dynamic((
                                                             Spoke(
             Triad&Server&1&                                 Server(
              192.168.1.10&                                    A(

                                   Triad&Server&2&
                                    192.168.1.11&




                 Triad&Server&3&
                  192.168.1.12&




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
New Server Dynamically Joining
                     Cloud
            Spin up a new VM instance and add it to the cluster. It talks to the triad to
            join




                                                            Dynamic((
                                                             Spoke(
                                                                        Dynamic((
                                                                         Spoke(
                                                                                    Ask for latest
             Triad&Server&1&
              192.168.1.10&
                                                             Server(     Server(
                                                                           B(
                                                                                    application
                                                                                    versions
                                                               A(

                                   Triad&Server&2&
                                    192.168.1.11&




                 Triad&Server&3&
                  192.168.1.12&




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“How do I configure the
         typology of the cluster?”




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Configuring Typology of
                   Cluster
     • Resin keeps it simple
          • Primarily a single JAR file with configuration file
          • Same configuration file
                •   Triad
                •   Web tier
                •   Any cluster tiers
                •   Spokes

     • Triad servers spun up
          • Usually static on different machines



Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Configuring Typology of
                   Cluster
     • Elastic servers spun up
                          (continued)

          • Using single command line
     • Easy to bring them up and down as needed




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“How does Resin support Cloud
        deployment and distributed
               versioning?”




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Cloud Deployment and
        Distributed Versioning on Resin
     • Based on HMTP messaging system
          • Forms basis for distributed cache
          • Distributed versioning based in Git
     • Internal version of Git library
          • Pushing a WAR or an application to Triad servers
                    • Git is used to internally push out to all other servers




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Cloud Deployment and
        Distributed Versioning on Resin
                                                         (continued)
     • Sessions in Cloud are tied to Git version of
          application
          • A number of sessions running off one version of
                application
          •     Push a new version
          •     Resin keeps that version of application until all
                sessions are over
          •     New sessions coming in will get new version of
                application




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“You’ve got replicated session
         state across the machines?
        What’s the overhead like for
      that; for actually replicating the
                  session?”


Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Overhead for Replicated Session
            State Across Machines
     • Pretty low
                • Only need to replicate to the server that is handling that
                    session

     • Using sticky sessions
                • With a lease
                • Same session goes to the same server and push session
                    update to Triad

     • Configurable
                • When to Push
                • Push after every update


Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Overhead for Replicated Session
         State Across Machines (continued)
     • Hashing sessions and comparison with master
          and spoke servers
          • Cuts down on network traffic




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“What’s the Watchdog
            system and why is that
              important for Cloud
                 deployment?”

Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Watchdog System
     • Resin always runs with two processes
     • Watchdog is the secondary process that
          controls Resin

     • When you start up a Resin server
          • Watchdog starts up first and starts up Resin for you
     • Monitors health of Resin system
          • Automatically restarts if there is an issue




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Watchdog System
                                                         (continued)


     • Cloud environment advantage
          • Watchdog system maintains health of servers
                • Prevents losing track of elastic servers
                • Reports any noticed issues
          • Health system is external process
                • Can detect when Resin is having issues




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“Can you describe some
        of the other reports I can
          get out of the health
        system? You have post-
           mortem reports for
                instance.”
Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Health System Reports
     • Watchdog Report
          • Prior to or leading up to a restart
                • Produce a report from the data we were tracking at the
                    time

     • PDF Report
                •   Tread dump
                •   Heap dump
                •   Stack dump
                •   JMX dump




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Health System Reports
                                                         (continued)


     • PDF Report (continued)
                • Goes through all JMX
                    • Dump out attributes and values
                    • Can do profiling if you want
                      • Internal native profiling library
                         • Can profile for a period of time
                •   Monitoring other attributes in system, for example:
                    • CPU Usage
                    • Memory usage
                    • File descriptors
                • Produces a “snapshot” PDF



Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“And you do JIT profiling
     as well, I think I’m right in
               saying?”



Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
JIT Profiling
     • Health system is very configurable
          • Any period of time
                • From a certain end response to a certain issue




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“How does what you offer
        compare to some of the other
        JavaEE vendors? WebLogic has
          some similar features, for
                  instance.”


Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Comparing Resin to other
                       JavaEE Vendors
     • Positioned between Tomcat and WebLogic
     • Enterprise quality server
          •     Elastic
          •     Health System
          •     Administration System
          •     More lightweight
                • Only 23 MB download
                • 6 second start-up time




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Comparing Resin to other
                     JavaEE Vendors (continued)
     • For customers who want enterprise quality that
          don’t need the heavyweight full JEE stack

     • Support JEE 6 Web Profile




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
“You also have an
          anomaly detection
      feature. Could you tell us
     a bit about that and where
        that idea came from?”
Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Anomaly Detection
                             Feature
     • Organically rose from need to support
          customers
          • As well as a lot of our health system
     • Result from an actual customer having thread
          spike issues
          • Noticed the issue in produced graphs
          • Unable to tell what was happening
          • Needed a snapshot at the time of issue




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Anomaly Detection
                             Feature
     • Monitors virtually any statistic in your JMS
                          (continued)

          • i.e. number of threads
                • Sees unusual spike in amount of threads
                    • Snapshot report is triggered

     • Invaluable in providing support
          • Detecting something unusual happening while its
                happening
          •     Creating a snapshot of the system to use for
                debugging




Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
Title
 • Caucho Technology | Home Page
 • Resin | Application Server
 • Resin | Java EE Web Profile Application Server
 • Resin - Cloud Support | 3G - Java Clustering
 • Resin | Java CDI | Dependency Injection / IoC
 • Resin - Health System | Java Monitoring and Server
      Monitoring

 • Download Resin | Application Server
 • Watch Resin | Application Server Featured Video
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Resin Application Server and Cloud discussed by Paul Cowan

  • 1. Resin Application Server Paul Cowan - InfoQ Interview Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 2. InfoQ - Paul Cowan Discusses the Resin Application Server and Cloud Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 3. About Paul Cowan • Software Engineer working on the Resin application server at Caucho Technology • Focusing on dependency injection, concurrency, high-speed messaging, and distributed caching • 11 years of experience • Started with NetDynamics • Prior to Caucho worked as Senior Architect with NAVTEQ • Traffic.com division Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 4. “Where do you see Resin in terms of the wider Cloud landscape?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 5. Resin and the Cloud Landscape • Resin fits on the elastic JEE application layer • We don’t sell the service or provide it to you • Not PaaS • Not SaaS • We are a infrastructure provider/vendor • You get the Resin software • You build your Cloud on it Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 6. “Can you tell us a little bit about how your Cloud support is architected?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 7. Resin Cloud Support Architected • Triad hub-and-spoke architecture • Hub • Three Primary Servers • Constantly communicating with each other • Spoke • Elastic Spoke Servers • Add or Remove as Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 8. “Why did you go for a hub-and-spoke rather than say a peer-to-peer cluster?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 9. Hub-and-Spoke vs. Peer- to-Peer • Most cases easier to have 3 primary servers • IP addresses are known • No need for auto-discovery • Creates problems in EC2 environments • Hub architecture with 3 primary servers • Responsible for caching data • Maintaining the knowledge of Cloud architecture • Eliminates a lot of issues you get with true peer-to- peer network Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 10. Basic Hub-and-Spoke Configuration Dynamic&& Spoke& Server& Triad& Triad& A& Server& Server& 1& 2& Triad& Server& Dynamic&& 3& Spoke& Server& B& Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 11. Basic Hub-and-Spoke Configuration Load(increases.( Spin(a(new(server(( Dynamic&& Dynamic(( up( Spoke& Spoke( Server& Server( Triad& Triad& A& C( Server& Server& 1& 2& Triad& Server& Dynamic&& 3& Spoke& Server& B& Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 12. “How do you keep the network traffic to a reasonable level as the number of spikes grows?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 13. Keeping Network Traffic at Reasonable Level as Spikes Grow • Messaging based on Hessian Network Protocol (HMTP) • During distributed sessions • Only update your session data when the data changes • Hashing session • Triad master will have a hash of what current data is • Spoke server verifies latest data • “Here is my hash, do I have the latest data?” • If hashes match very little data needs to be sent Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 14. New Server Dynamically Joining Cloud Dynamic(( Spoke( Triad&Server&1& Server( 192.168.1.10& A( Triad&Server&2& 192.168.1.11& Triad&Server&3& 192.168.1.12& Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 15. New Server Dynamically Joining Cloud Spin up a new VM instance and add it to the cluster. It talks to the triad to join Dynamic(( Spoke( Dynamic(( Spoke( Ask for latest Triad&Server&1& 192.168.1.10& Server( Server( B( application versions A( Triad&Server&2& 192.168.1.11& Triad&Server&3& 192.168.1.12& Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 16. “How do I configure the typology of the cluster?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 17. Configuring Typology of Cluster • Resin keeps it simple • Primarily a single JAR file with configuration file • Same configuration file • Triad • Web tier • Any cluster tiers • Spokes • Triad servers spun up • Usually static on different machines Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 18. Configuring Typology of Cluster • Elastic servers spun up (continued) • Using single command line • Easy to bring them up and down as needed Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 19. “How does Resin support Cloud deployment and distributed versioning?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 20. Cloud Deployment and Distributed Versioning on Resin • Based on HMTP messaging system • Forms basis for distributed cache • Distributed versioning based in Git • Internal version of Git library • Pushing a WAR or an application to Triad servers • Git is used to internally push out to all other servers Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 21. Cloud Deployment and Distributed Versioning on Resin (continued) • Sessions in Cloud are tied to Git version of application • A number of sessions running off one version of application • Push a new version • Resin keeps that version of application until all sessions are over • New sessions coming in will get new version of application Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 22. “You’ve got replicated session state across the machines? What’s the overhead like for that; for actually replicating the session?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 23. Overhead for Replicated Session State Across Machines • Pretty low • Only need to replicate to the server that is handling that session • Using sticky sessions • With a lease • Same session goes to the same server and push session update to Triad • Configurable • When to Push • Push after every update Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 24. Overhead for Replicated Session State Across Machines (continued) • Hashing sessions and comparison with master and spoke servers • Cuts down on network traffic Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 25. “What’s the Watchdog system and why is that important for Cloud deployment?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 26. Watchdog System • Resin always runs with two processes • Watchdog is the secondary process that controls Resin • When you start up a Resin server • Watchdog starts up first and starts up Resin for you • Monitors health of Resin system • Automatically restarts if there is an issue Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 27. Watchdog System (continued) • Cloud environment advantage • Watchdog system maintains health of servers • Prevents losing track of elastic servers • Reports any noticed issues • Health system is external process • Can detect when Resin is having issues Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 28. “Can you describe some of the other reports I can get out of the health system? You have post- mortem reports for instance.” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 29. Health System Reports • Watchdog Report • Prior to or leading up to a restart • Produce a report from the data we were tracking at the time • PDF Report • Tread dump • Heap dump • Stack dump • JMX dump Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 30. Health System Reports (continued) • PDF Report (continued) • Goes through all JMX • Dump out attributes and values • Can do profiling if you want • Internal native profiling library • Can profile for a period of time • Monitoring other attributes in system, for example: • CPU Usage • Memory usage • File descriptors • Produces a “snapshot” PDF Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 31. “And you do JIT profiling as well, I think I’m right in saying?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 32. JIT Profiling • Health system is very configurable • Any period of time • From a certain end response to a certain issue Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 33. “How does what you offer compare to some of the other JavaEE vendors? WebLogic has some similar features, for instance.” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 34. Comparing Resin to other JavaEE Vendors • Positioned between Tomcat and WebLogic • Enterprise quality server • Elastic • Health System • Administration System • More lightweight • Only 23 MB download • 6 second start-up time Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 35. Comparing Resin to other JavaEE Vendors (continued) • For customers who want enterprise quality that don’t need the heavyweight full JEE stack • Support JEE 6 Web Profile Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 36. “You also have an anomaly detection feature. Could you tell us a bit about that and where that idea came from?” Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 37. Anomaly Detection Feature • Organically rose from need to support customers • As well as a lot of our health system • Result from an actual customer having thread spike issues • Noticed the issue in produced graphs • Unable to tell what was happening • Needed a snapshot at the time of issue Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 38. Anomaly Detection Feature • Monitors virtually any statistic in your JMS (continued) • i.e. number of threads • Sees unusual spike in amount of threads • Snapshot report is triggered • Invaluable in providing support • Detecting something unusual happening while its happening • Creating a snapshot of the system to use for debugging Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server
  • 39. Title • Caucho Technology | Home Page • Resin | Application Server • Resin | Java EE Web Profile Application Server • Resin - Cloud Support | 3G - Java Clustering • Resin | Java CDI | Dependency Injection / IoC • Resin - Health System | Java Monitoring and Server Monitoring • Download Resin | Application Server • Watch Resin | Application Server Featured Video Caucho Home | Contact Us | Caucho Blog | Wiki | Application Server

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