Comment 8 for bug 1183322

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Raghavendra D Prabhu (raghavendra-prabhu) wrote :

"This means 'nofile' (which is the file descriptor limit for that user) is not unlimited but limited to 65535."

Since, xtrabackup doesn't check that mysqld variable (from my.cnf, lp:1183793 is for that), so in this case only the shell's ulimits should apply here.