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https://issues.apache.org/jira/browse/IGNITE-12439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17016865#comment-17016865
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Ivan Bessonov commented on IGNITE-12439:
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[~sergey-chugunov] looks good to me, please proceed with merge.
> More descriptive message in situation of IgniteOutOfMemoryException, warning
> message if risk of IOOME is found
> --------------------------------------------------------------------------------------------------------------
>
> Key: IGNITE-12439
> URL: https://issues.apache.org/jira/browse/IGNITE-12439
> Project: Ignite
> Issue Type: Improvement
> Reporter: Sergey Chugunov
> Assignee: Sergey Chugunov
> Priority: Major
> Fix For: 2.9
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In persistent mode starting many caches in a data region of a small size may
> lead to IgniteOutOfMemoryException being thrown.
> The root cause is that each partition requires allocation of one or more
> metapages that should be stored during checkpoint and cannot be replaced by
> other types of pages.
> As a result when too many metapages occupy significant portion of data
> region's space a request to replace a page in memory (with one on disk) may
> not be able to find clean page for replacement. In this situation
> IgniteOutOfMemoryException is thrown.
> It is not easy to prevent IOOME in general case, but we should provide more
> descriptive message when the exception is thrown and/or print out warning to
> logs when too many caches (or one cache with huge number of partitions) are
> started in the same data region.
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