Jürgen Kress

WebLogic Server Continuous Availability in 12.2.1.1 by Monica Riccelli

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We have made enhancements to the Continuous Availability Offering in WebLogic 12.2.1.1 in the areas of Zero Downtime Patching, Cross Site Transaction Recovery, Coherence Federated Caching and Coherence Persistence. We have also enhanced the documentation to provide design considerations for the multi-data center Maximum Availability Architectures (MAA) that are supported for WebLogic Server Continuous Availability.

Zero Downtime Patching Enhancements

Enhancements in Zero Downtime Patching support updating applications running in a multitenant partition without affecting other partitions that run in the same cluster. Coherence applications can now be updated while maintaining high availability of the Coherence data during the rollout process. We have also removed the dependency on NodeManager to upgrade the WebLogic Administration Server.

    • Multitenancy support
    • Application updates can use partition shutdown instead of server shutdowns.
    • Can update an application in a partition on a server without affecting other partitions.
    • Can update an application referenced by a ResourceGroupTemplate.
  • Coherence support – User can supply minimum safety mode for rollout to Coherence cluster.
  • Removed Administration Server dependency on NodeManager – The Administration Server no longer needs to be started by NodeManager.

Cross-Site Transaction Recovery

We introduced a “Site Leasing” mechanism to do auto recovery when there is a site failure or mid-tier failure. With site leasing we provide a more robust mechanism to failover and failback transaction recovery without imposing dependencies on the TLog which affect the health of the Servers hosting the Transaction Manager.

Every server in a site will update their lease. When the lease expires for all servers running in a cluster in Site 1, servers running in a cluster in a remote site assume ownership of the TLogs, and recover the transactions while still continuing their transaction work. Read the complete article here.

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Published by Jürgen Kress

As a middleware expert Jürgen works at Oracle EMEA Alliances and Channels, responsible for Oracle’s EMEA Fusion Middleware partner business. He is the founder of the Oracle SOA & BPM and the WebLogic Partner Communities and the global Oracle Partner Advisory Councils. With more than 5000 members from all over the world the Middleware Partner Community is the most successful and active community at Oracle. Jürgen manages the community with monthly newsletters, webcasts and conferences. He hosts his annual Fusion Middleware Partner Community Forums and the Fusion Middleware Summer Camps, where more than 200 partners get product updates, roadmap insights and hands-on trainings. Supplemented by many web 2.0 tools like twitter, discussion forums, online communities, blogs and wikis. For the SOA & Cloud Symposium by Thomas Erl, Jürgen is a member of the steering board. He is also a frequent speaker at conferences like the SOA & BPM Integration Days, JAX, UKOUG, OUGN, or OOP.

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