How does am sharing happens in the env cluster

can someone indicate topics... Thank you.

In general, the links ADF layer creates a JboDataControl object and stores it in the HTTP session. (This is not stored directly in the HttpSession, but in a container called DataControl Frame object. We're going for simplicity to skip those details). The HTTP session is replicated to another server in the cluster (which is done by the WLS cluster) and the JboDataControl is replicated as part of session replication. The JboDataControl contains an instance of a class of SessionCookie (there is a related class of the ADF, do not be fooled by its name and get an association wrong with HTTP cookies, which have nothing to do here). The SessionCookie contains the ID of the State AM passive of the instance of AOS, which was used by the DataControl last time. When comes the next HTTP request (it can happen on the same server or on a secondary server in the cluster, where the HTTP session is replicated), the JboDataControl allocates an instance AM pool (which could be an arbitrary instance of AM to the pool) and activates its State according to the ID of the report of the SessionCookie (using the passive of the passivation AM store state).

Necessary AOS configuration to be configured to make "Tipping Transaction State on managed Release" so that this mechanism to work. This indicates the instance AM doing passivation of mandatory State at the end of each request. This must be done so that the application of ADF activate State AM on the other server in the cluster, if the failure of the principal server and the next request arrives on the secondary server. This mandatory passivation puts considerable achievements to the application. On the other hand, if the application is not clustered, passivation State AM happen only when a particular instance of AM of the pool is recycled in another user session. The performance overhead is the trade-off between the clusters and applications ADF nonclustered indexes.

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Tags: Java

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