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About the only impact I noticed was I had problems with Reddit. Apparently there were some issues with Java and some Linux servers, but I'm not sure how widespread they were. There was also a bug report from Mozilla that said they were having problems with Hadoop, which makes since in light of the Java issues. On the positive side, to correct the problem was apparently pretty straight forward for many of those having issues - reboot the servers. These kind of things happen every few years because it doesn't take precisely 24 hours for each rotation of the earth; I always find it mildly surprising that it continues to cause problems.