title: Mysql Replicate, Master updates lock Slaves selects
body: <p>I have have a classifieds site with tons of traffic, have 1 master and 3 slaves.  Every slave is a web server and uses his localhost mysql for select queries and master for writes.  The app is developed in Rails 3.0.7 (Octopus for replicate) with MySQL 5.0.77 and I have a huge problem: </p>
  
  <p>In moments of high traffic, the master replication (inserts, updates and deletes) locks completely the table that he is writing to.  This is normal, I know, but query takes like 15 seconds some times locking every select, and it hurts me bad.</p>