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This is a version of code that runs on Facebook's data warehouse clusters and is powered by Apache Hadoop. The size of the biggest single cluster is 30 PB and has 3000 nodes. This code is based on Apache Hadoop 0.20. FB-CHANGES.txt contains the additional pathches that have been committed to the original code base. PLEASE NOTE: * This distribution includes cryptographic software that is subject to U.S. export control laws and applicable export and import laws of other countries. BEFORE using any software made available from this site, it is your responsibility to understand and comply with these laws. This software is being exported in accordance with the Export Administration Regulations. As of June 2009, you are prohibited from exporting and re-exporting this software to Cuba, Iran, North Korea, Sudan, Syria and any other countries specified by regulatory update to the U.S. export control laws and regulations. Diversion contrary to U.S. law is prohibited.