[infinispan-issues] [JBoss JIRA] (ISPN-4880) Distribution mode-friendly preloading

[Tristan Tarrant (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-4880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tristan Tarrant updated ISPN-4880:
----------------------------------
    Fix Version/s: 9.0.0.Alpha3
                       (was: 9.0.0.Alpha2)


> Distribution mode-friendly preloading
> -------------------------------------
>
>                 Key: ISPN-4880
>                 URL: https://issues.jboss.org/browse/ISPN-4880
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Core, Loaders and Stores
>    Affects Versions: 7.0.0.CR2
>            Reporter: Dan Berindei
>             Fix For: 9.0.0.Alpha3
>
>
> For non-shared stores, we need a graceful restart to make sure each node receives the exact same segments after restart, and that keys aren't readable/writable until re recover all the segments. 
> With a shared store, however, we could replace the implicit preload with an explicit preload that can be called by the user after the cluster is fully formed.
> Currently, preloading happens before the cache is a full member of the cluster, so it wants to load every key on every node. In a large cluster, that means most of the keys loaded by preload will be discarded as it joins and finds out it owns only a tiny slice of the data.
> Preloaded values might be out of date before the node becomes a full member (because writes on the existing nodes will update the shared store, but not the joiner's in-memory data). The only way to avoid that is to delete everything that was preloaded on join, meaning even more lost work.



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