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Documentation for 1.x is archived here

FST 1.x is somewhat faster, 2.x pays a small price for an overall better abstraction and additional features.

changes from 1.x to 2.x:

• renamed package :-)
• Removed some old classes (rarely used stuff like OffHeap/Compressed Objects classes) + some annotations & flags in order to get fst easier to maintain.
• Added limited versioning support
• KSon: easy text => object mapping with an extension of JSon. [config files, testdata]
• New implementation of OffHeap support: Easy to use OffHeap Map, persistant Map's (based on memory mapped files). Focus is on convenience, ease of use + fast iteration (leverages fast-serialization for that).
• MinBin binary codec to enable cross-platform serialization (currently only javascript reader implemented). Also enables reading serialized streams without the need to have the original classes.
• cleaned up test mess.

Documentation:

How to use Fast-Serialization