System and method for supporting patching in a multitenant application server environment
In accordance with an embodiment, described herein is a system and method for supporting patching in a multi-tenant application server environment. The system can associate one or more partitions with a tenant, for use by that tenant, wherein a partition is a runtime and administrative subdivision or slice of a domain. A patching process can take advantage of high-availability features provided by an application server clustering environment, to apply patches in a controlled, rolling restart, which maintains a domain's ability to operate without interruption, or with zero downtime. The process can be used to automate complex or long running tasks, including preserving an unpatched or prior version of an application server, application, or other software component for possible rollback, or providing automatic reversion in the event of an unrecoverable error.
1. A system for supporting patching in a multitenant application server environment, comprising:
at least one computer and an application server environment executing thereon; and
a plurality of managed server instances that operate within the application server environment as part of a domain that supports a plurality of partitions, wherein each partition, of the plurality of partitions, provides a subdivision of the domain that provides a runtime for use by that partition, and wherein the system uses a patching process that is performed by the application server environment to update the plurality of managed server instances in a controlled manner that maintains operations of the domain without interruption, including:
creating a patched home directory, and
performing a rollout of the patched home directory to the plurality of managed server instances, including for each managed server instance of the plurality of managed server instances:
shutting down the managed server instance,
updating the managed server instance to use an instance of the patched home directory, and
restarting the managed server instance to cause the managed server instance to be updated according to the instance of the patched home directory.
2. The system of claim 1 , further comprising a traffic director that is configured for use with the multitenant application server environment including that, when a particular managed server instance of the plurality of managed server instances becomes unavailable, the traffic director receives a message indicative of the particular managed server instance of the plurality of managed server instances being unavailable, and attempts to contact another managed server instance of the plurality of managed server instances.
3. The system of claim 1 , further comprising one or more resource groups, which include groupings of deployable resources for use by a partition within a domain, including that each partition, of the plurality of partitions, includes at least one resource group for use by that partition.
4. The system of claim 1 , wherein the system is provided within a cloud environment to support multiple tenants operating within the cloud environment, including that each partition, of the plurality of partitions, is enabled to be associated with a tenant of the cloud environment.
5. The system of claim 1 , wherein each partition, of a plurality of partitions, is enabled to be associated with a tenant of the application server environment.
6. The system of claim 1 , wherein the system is configured to, during the patching process:
receive, at a load balancer, a request for a session,
attempt to load the requested session at a first managed server instance of the plurality of managed server instances, and
if the first managed server instance of the plurality of managed server instances cannot load the requested session, then load the requested session at a second managed server instance of the plurality of managed server instances.
7. The system of claim 6 , wherein directing of requests associated with sessions to particular managed server instances of the plurality of managed server instances enables requests associated with particular versions of at least one application server, application, or other component to be directed to managed server instances handling those particular versions.
8. A method for supporting patching in a multitenant application server environment, comprising:
executing, on at least one computer, an application server environment, together with a plurality of managed server instances that operate within the application server environment as part of a domain that supports a plurality of partitions, wherein each partition, of the plurality of partitions, provides a subdivision of the domain that provides a runtime for use by that partition; and
performing, by the application server environment, a patching process to update the plurality of managed server instances in a controlled manner that maintains operations of the domain without interruption, including:
creating a patched home directory, and
performing a rollout of the patched home directory to the plurality of managed server instances, including for each managed server instance of the plurality of managed server instances:
shutting down the managed server instance,
updating the managed server instance to use an instance of the patched home directory, and
restarting the managed server instance to cause the managed server instance to be updated according to the instance of the patched home directory.
9. The method of claim 8 , further comprising providing a traffic director that is configured for use with the multitenant application server environment including that, when a particular managed server instance of the plurality of managed server instances becomes unavailable, the traffic director receives a message indicative of the particular managed server instance of the plurality of managed server instances being unavailable, and attempts to contact another managed server instance of the plurality of managed server instances.
10. The method of claim 8 , further comprising providing one or more resource groups, which include groupings of deployable resources for use by a partition within a domain, including that each partition, of the plurality of partitions, includes at least one resource group for use by that partition.
11. The method of claim 8 , wherein the method is provided within a cloud environment to support multiple tenants operating within the cloud environment, including that each partition, of the plurality of partitions, is enabled to be associated with a tenant of the cloud environment.
12. The method of claim 8 , wherein each partition, of a plurality of partitions, is enabled to be associated with a tenant of the application server environment.
13. The method of claim 8 , wherein the application server environment is configured to, during the patching process:
receive, at a load balancer, a request for a session,
attempt to load the requested session at a first managed server instance of the plurality of managed server instances, and
if the first managed server instance of the plurality of managed server instances cannot load the requested session, then load the requested session at a second managed server instance of the plurality of managed server instances.
14. The method of claim 13 , wherein directing of requests associated with sessions to particular managed server instances of the plurality of managed server instances enables requests associated with particular versions of at least one application server, application, or other component to be directed to managed server instances handling those particular versions.
15. A non-transitory computer readable storage medium, including instructions stored thereon which when read and executed by one or more computers cause the one or more computers to perform a method comprising:
executing, on at least one computer, an application server environment, together with a plurality of managed server instances that operate within the application server environment as part of a domain that supports a plurality of partitions, wherein each partition, of the plurality of partitions, provides a subdivision of the domain that provides a runtime for use by that partition; and
performing, by the application server environment, a patching process to update the plurality of managed server instances in a controlled manner that maintains operations of the domain without interruption, including:
creating a patched home directory, and
performing a rollout of the patched home directory to the plurality of managed server instances, including for each managed server instance of the plurality of managed server instances:
shutting down the managed server instance,
updating the managed server instance to use an instance of the patched home directory, and
restarting the managed server instance to cause the managed server instance to be updated according to the instance of the patched home directory.
16. The non-transitory computer readable storage medium of claim 15 , further comprising providing a traffic director that is configured for use with the multitenant application server environment including that, when a particular managed server instance of the plurality of managed server instances becomes unavailable, the traffic director receives a message indicative of the particular managed server instance of the plurality of managed server instances being unavailable, and attempts to contact another managed server instance of the plurality of managed server instances.
17. The non-transitory computer readable storage medium of claim 15 , further comprising providing one or more resource groups, which include groupings of deployable resources for use by a partition within a domain, including that each partition, of the plurality of partitions, includes at least one resource group for use by that partition.
18. The non-transitory computer readable storage medium of claim 15 , wherein the method is provided within a cloud environment to support multiple tenants operating within the cloud environment, including that each partition, of the plurality of partitions, is enabled to be associated with a tenant of the cloud environment.
19. The non-transitory computer readable storage medium of claim 15 , wherein the application server environment is configured to, during the patching process:
receive, at a load balancer, a request for a session,
attempt to load the requested session at a first managed server instance of the plurality of managed server instances, and
if the first managed server instance of the plurality of managed server instances cannot load the requested session, then load the requested session at a second managed server instance of the plurality of managed server instances.
20. The non-transitory computer readable storage medium of claim 19 , wherein directing of requests associated with sessions to particular managed server instances of the plurality of managed server instances enables requests associated with particular versions of at least one application server, application, or other component to be directed to managed server instances handling those particular versions.