Map<D,B>Map<D,B>MapDB provides Java Maps, Sets, Lists, Queues and other collections backed by off-heap or on-disk storage. It is a hybrid between java collection framework and embedded database engine. It is free and open-source under Apache license.
GitHub - xerial/larray: Large off-heap arrays and mmap files for Scala and Java
LArray can create arrays with more than 2G(2^31) entries. 2^31 -1 (2G) is the limitation of the default Java/Scala array size, because these arrays use 32-bit signed integer (int) as indexes. LArray uses long type indexes of 64-bit signed integers to resolve this limitation. For example, the entire human genome data (3GB) can be stored in LArray. LArray can be released immediately from the memory.
Byte Buffers and Non-Heap Memory
Byte Buffers and Non-Heap Memory Originally published: 2010-04-04 Last updated: 2017-01-22 Most Java programs spend their time working with objects on the JVM heap, using getter and setter methods to retrieve or change the data in those objects. A few programs, however, need to do something different. Perhaps they're exchanging data with a program written in C. Or they need to manage large chunks
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