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I have a Percona MySQL master-slave server configuration(5.6.20-68.0). The memory usage by MySQL on the slave server is constantly growing.

Now it reached 68G despite the fact that innodb_buffer_pool_size was set to 30720M. On the Master server memory is stable. Any idea?

I have checked the connections on both servers. But the results are strange. On the Master DB server there are more connections than on the slave:

Master

netstat | grep TIME_WAIT | wc -l

148

htop
mysql VIRT 44G RES 34,7G

Slave

netstat | grep TIME_WAIT | wc -l

78

htop
mysql VIRT 174G RES 68G

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