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Terracotta’s OffHeap Explained by Chris Dennis

1,729 views · Published 13 November 2015 · 49:50 · Indexed 17 October 2026

Channel: Devoxx · 2015 · People & Blogs

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Terracotta open sourced it’s core offheap library earlier this year. Despite being a Terracotta project, it:

doesn’t use byte code engineering,
doesn’t require running a modified JVM.
Despite being an offheap library, it:

doesn’t use non-standard APIs or JNI,
doesn’t do reflection on core JDK types.
It does however:

provide a library of maps and caches with significantly sub-linear per key heap overheads,
scale up to 6TB in a single node and 1TB in a single map.
What follows will be an explanation of how well understood CS concepts from managed and unmanaged programing environments combine to produce a stable, reliable, and useful library. There is no secret sauce here, and the source is no longer secret.

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