Sergey Chugunov created IGNITE-12439:
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Summary: 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
Fix For: 2.9
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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