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This is work by Fabrice Bellard, the author of a long list of technically impressive projects that includes FFMPEG and QEMU. It makes heavy use of typed arrays in order to achieve acceptably fast x86 emulation. Consult the technical notes for more details: http://bellard.org/jslinux/tech.html.
Spark is a MapReduce-like cluster computing framework designed for low-latency iterative jobs and interactive use from an interpreter (think about sequences of map, filter, reduce). It can load data from any Hadoop InputFormat, and can run on Apache Mesos or in standalone mode.