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https://issues.apache.org/jira/browse/IGNITE-1789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15324894#comment-15324894
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Dmitriy Setrakyan commented on IGNITE-1789:
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Michael, why do you need 2 identical data sets in memory? What you are asking
for can be done with a simple iteration through one cache and putting data into
another. However, you would have to make sure that when changing keys, the
key-affinity remains the same, so it stays on the same node. Please see
{{AffinityKeyMapped}} and {{AffinityKeyMapper}} interfaces to control affinity
mapping.
> Data Snapshots for Ignite caches
> --------------------------------
>
> Key: IGNITE-1789
> URL: https://issues.apache.org/jira/browse/IGNITE-1789
> Project: Ignite
> Issue Type: New Feature
> Components: cache
> Reporter: Raúl Kripalani
> Assignee: Saikat Maitra
>
> There was a discussion in the dev forum about Data Snapshots in Ignite as a
> way to obtain a consistent and "frozen" view of one or multiple caches in
> order to execute a set of SQL queries, distributed closures, map reduce, etc.
> without having to worry about data slippage (or moving data).
> The discussion is here:
> http://apache-ignite-developers.2346864.n4.nabble.com/Data-Snapshots-in-Ignite-td4183.html
> and we still need to mature the idea, but several users chimed in and
> considered it interesting.
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