[infinispan-issues] [JBoss JIRA] (ISPN-5515) Purge store if there is another node already running

[Sanne Grinovero (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-5515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13073161#comment-13073161 ] 

Sanne Grinovero commented on ISPN-5515:
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{quote}We already discussed this on the mailing list, and the conclusion was to implement graceful restart. {quote}
Right, I'm exactly concerned about that metodology: we agreed to do something else on the mailing list!

{quote}This issue is not really about implementing new functionality, it's about automating a recommendation we already have for users who want it.{quote}
I'll have to trust you on that as I have no idea which recommendations you are referring to. The only one recommendation which I would give, is don't use a shared cachestore unless it's for temporary passivation (and wipe them all clean at boot).

> Purge store if there is another node already running
> ----------------------------------------------------
>
>                 Key: ISPN-5515
>                 URL: https://issues.jboss.org/browse/ISPN-5515
>             Project: Infinispan
>          Issue Type: Enhancement
>          Components: Core, Loaders and Stores
>    Affects Versions: 7.2.2.Final, 8.0.0.Alpha1
>            Reporter: Dan Berindei
>            Assignee: Dan Berindei
>             Fix For: 8.0.0.Alpha2
>
>
> Preloading happens before communicating with other nodes that might already have the cache running. When joining the existing members, the cache then waits to receive the first CH in which it is a member, and then deletes only the entries in the segments that it doesn't own in that CH.
> The intention of this was to remove as little as possible from the existing data, e.g. if the first node to start up is not the one that was stopped last. But the preloaded entries are not replicated to the other nodes, so this can lead to inconsistencies.
> It would be better to delay preloading until we know we are the first node to start up, but failing that we could clear the data container and the store before receiving the initial state.
> Note that this will only allow preloading data from one node. Restoring data from more nodes is harder to do, and we will implement it as part of graceful restart.



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