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by default Ignite 2.+ stores all data in off heap, but you can turn on on-heap too: https://apacheignite.readme.io/v2.1/docs/memory-configuration#on-heap-caching Looks like you use ignite 2.0, there was a bug about this: https://issues.apache.org/jira/browse/IGNITE-5461 visor just shows wrong values about "OffHeap allocated size" and "OffHeap Entries Count". According jira it should be fixed in 2.1 version. Thanks, Mikhail. -- View this message in context: http://apache-ignite-users.70518.x6.nabble.com/Need-some-clarification-about-cache-statistics-and-off-heap-memory-tp14992p15003.html Sent from the Apache Ignite Users mailing list archive at Nabble.com.