title: Cassandra: I see ALTER TABLE ... in the logs but why ? Is it Cassandra internal
body: <p>I am monitoring a system, and in Cassandra I see lots of </p>
  
  <blockquote>
    <p>ALTER TABLE tbl-name ADD column-name type</p>
  </blockquote>
  
  <p>The legacy code I am going through I cannot see any ALTER TABLE
  So either Cassandra is synchronising somehow between nodes
  OR I have people in my env doing funky stuff </p>
  
  <p>Any ideas how to figure out from where these ALTER commands are coming from ?</p>
  
  <p>Using Cassandra 3.11, Scala, and Phantom DSL 1.28</p>