Synchronize update across cluster

Question

I have a web application that maintains a version flag as a ServletContext.setAttribute('flag', flagValue)

A Filter uses this flagValue in its doFilter method applied to diff servlets.

There is a notification service which toggles the value of the 'flag'.

Now I need to deploy this app in a clustered environment. Given the fact that ServletContext is per JVM, how do I propagate the update received on the notification url across the multiple servers in the cluster?

Not exactly the same, but similar question here: http://stackoverflow.com/questions/8745049/j2ee-application-scoped-variables-in-a-clustered-environment-websphere — dbreaux, May 11 '12 at 14:19
@dbreaux I am thinking on similar lines - notifying individual AppServer urls... unless someone has a better idea. — Nirmal Patel, May 14 '12 at 07:40

score 0 · Answer 1 · answered May 12 '12 at 11:17

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You can use Dynacaches DistributedMap to share the value across the cluster, then the other servers just need to check for changes when they would be affected by it.

answered May 12 '12 at 11:17

covener

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score 0 · Accepted Answer · answered Jun 19 '12 at 06:37

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Ended up notifying individual AppServer urls.

answered Jun 19 '12 at 06:37

Nirmal Patel

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Synchronize update across cluster

2 Answers2