# Row based replication lagging on 5.6.25-73

**URL:** <https://forums.percona.com/t/row-based-replication-lagging-on-5-6-25-73/4430>\
**Category:** Other MySQL® Questions\
**Created:** [October 2, 2015, 11:55pm UTC](https://forums.percona.com/t/row-based-replication-lagging-on-5-6-25-73/4430 "2015-10-02T23:55:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nobikenobi](https://avatars.discourse-cdn.com/v4/letter/n/eb8c5e/32.png) [@nobikenobi](https://forums.percona.com/u/nobikenobi)\
**Post date:** [October 2, 2015, 11:55pm UTC](https://forums.percona.com/t/row-based-replication-lagging-on-5-6-25-73/4430/1 "2015-10-02T23:55:21Z")

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Hi  
I did rebuild a slave recntly. the replication is row based. Many MyISAM tables.  
Just can’t catch up!

I treid the suggestions on this post, but still can not figure it out  
[url][https://www.percona.com/blog/2014/05/02/how-to-identify-and-cure-mysql-replication-slave-lag/[/url]](https://www.percona.com/blog/2014/05/02/how-to-identify-and-cure-mysql-replication-slave-lag/%5B/url%5D)

Basically, the IO\_thread is the issue, Relay\_Master\_Log\_File seems to be lagging a lot.  
The master and slave have same hardware.

Thnak you