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Ignite uses page memory organization to store a cache information. To use a memory more effectively a free list data structure are 1 are using.
The free list is a doubly linked list that stores a reference to memory pages of approximately equal free space. For example, a free list has a different link to stores all the data pages that have up to 75% free space, and a list that keeps track of the index pages with 25% free space. Data and index pages are tracked in separate free lists.
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// Links to various reference documents, if applicable.
1 https://apacheignite.readme.io/docs/memory-architecture#section-free-lists
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