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  1. PO
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    <p>I will try to present here possible solution from Infinispan point of view.</p> <p>In your use case I would suggest to use cluster of Infinispan standalone nodes (client-server access, for example via HotRod) with configured underlying cache store.</p> <p><a href="https://docs.jboss.org/author/display/ISPN/Infinispan+Server" rel="nofollow">https://docs.jboss.org/author/display/ISPN/Infinispan+Server</a> &amp; <a href="https://docs.jboss.org/author/display/ISPN/Using+Hot+Rod+Server" rel="nofollow">https://docs.jboss.org/author/display/ISPN/Using+Hot+Rod+Server</a></p> <p>Now more specifically to your questions:</p> <blockquote> <p>What I need to know is how this cache will be repopulated when the individual nodes or the entire application restarts.</p> </blockquote> <p>That's why I suggest you to use let's say "independent" cluster with remote client-server access. Your caching layer does not depend directly on your application. When application restarts, crash, redeploying... you still have cached data in Infinispan cluster and simply connect to it once your app lives again.</p> <blockquote> <p>All the data that a node requires is present in the underlying database. So can each node simply load the data from its database and populate the cache after restarts? </p> </blockquote> <p>In Infinispan, yes. Nodes are able to load data from cache store. Please see this section: <a href="https://docs.jboss.org/author/display/ISPN/Cache+Loaders+and+Stores" rel="nofollow">https://docs.jboss.org/author/display/ISPN/Cache+Loaders+and+Stores</a> and especially <strong>preload</strong> configuration element which is there for pre-loading data from store to the cache after cache start.</p> <blockquote> <p>How will the cache then bring the cluster nodes to a single state? </p> </blockquote> <p>There is a <em>state transfer</em> in Infinispan. This new implementation (<a href="https://community.jboss.org/wiki/Non-BlockingStateTransferV2" rel="nofollow">https://community.jboss.org/wiki/Non-BlockingStateTransferV2</a>) even doesn't block your cluster any more during new nodes joining. State transfer simply takes care about your data distribution across the cluster after join/leave changes. </p> <blockquote> <p>Is there a way an app can reload the cache with all the data at restart and have all the caches do the same and sync up the deltas?</p> </blockquote> <p>Yes, according to all mentioned above. You can simply use replication so entries are replicated to all nodes and the state is consistent. However, this case is better for heavy-read scenario. In your case, I suppose, distribution mode with respective numberOfOwner should be enough.</p>
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    1. POHow is re-population of replicated caches handled after system restarts
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    1. UStsykora
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      1. VTUpMod
    1. COthank you for the reply. The 4 concerns i have about the proposal are 1) Will it be suitable for fast lookups (see the edit i have made about how the cache will be used) 2) Does it support locking access / transactions 3) Does the independent cluster require a custom server and licenses? 4) How suitable is this model to WAN deployments?
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      1. UScomputinglife
    2. COSorry for late response. Unfortunately I can't properly answer most of your more specific questions. I hope someone from developers will react soon here.
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