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Facebook's Realtime Distributed FS based on Apache Hadoop 0.20-append

branch: master
This is a version of code that runs on Facebook's clusters and is powered by
Apache Hadoop. It is used for both the warehouse workloads and the realtime
HBase/Scribe workloads.

This code is based on Apache Hadoop 0.20/Apache Hadoop 0.20-append.

FB-CHANGES.txt contains the additional pathches that have been committed to
the original code base.

For instructions on starting a Corona cluster, see


 * This distribution includes cryptographic software that
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   are prohibited from exporting and re-exporting this
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   the U.S. export control laws and regulations. Diversion
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