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LZ4 compression can be a lot faster than gzip compression, so users may prefer it even if the compression ratio is not as good. We will want pg_basebackup to support LZ4 compression and decompression on the client side as well, and there is a pending patch for that, but it's by a different author, so I am committing this part separately for that reason. Jeevan Ladhe, reviewed by Tushar Ahuja and by me. Discussion: http://postgr.es/m/CANm22Cg9cArXEaYgHVZhCnzPLfqXCZLAzjwTq7Fc0quXRPfbxA@mail.gmail.com