I could connect to local MySQL successfully:
gf@li741-164 ~> mysql -uroot -S /run/mysqld/mysqld.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 202
Server version: 5.6.21-70.1 Source distribution
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Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
but when using pt-kill,it seems hangs to connect to MySQL,I waited for 5 minutes ,but it still hangs:
gf@li741-164 ~> pt-kill --busy-time 6 --user root --print --socket /run/mysqld/mysqld.sock