mysql增量恢复报错，请高人帮忙指点

zhancat200801

[root@zhancat200807 full]# innobackupex --apply-log-only --redo-only /tmp/mysql/full/2015-12-20_19-55-10/ --incremental-dir=/tmp/mysql/full/2015-12-20_20-30-26/
151220 20:59:38 innobackupex: Starting the backup operation

IMPORTANT: Please check that the backup run completes successfully.
           At the end of a successful backup run innobackupex
           prints "completed OK!".

151220 20:59:38  version_check Connecting to MySQL server with DSN 'dbi:mysql:;mysql_read_default_group=xtrabackup' (using password: NO).
Failed to connect to MySQL server: DBI connect(';mysql_read_default_group=xtrabackup','',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at - line 1314
151220 20:59:38 Connecting to MySQL server host: localhost, user: (null), password: not set, port: 0, socket: (null)
Failed to connect to MySQL server: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2).

哪位高人帮忙瞧瞧，提示是什么意思？我这是恢复，不是备份，本来是要断开mysql服务器的，为何报错还要提示无法连接？多谢！