src/java/org/apache/cassandra/db/migration/Migration.java
/** send this migration immediately to existing nodes in the cluster.  apply() must be called first. */
send this migration immediately to existing nodes in the cluster.  apply() must be called first.
send this migration immediately to existing nodes in the cluster . apply () must be called first .
public final void announce()
    {
        assert !StorageService.instance.isClientMode();
        assert column != null;
        MigrationManager.announce(column);
        passiveAnnounce(); 
    }
public final void announce ( ) { assert ! StorageService . instance . isClientMode ( ) ; assert column != null ; MigrationManager . announce ( column ) ; passiveAnnounce ( ) ; }
send this migration immediately to existing nodes in the cluster.
send this migration immediately to existing nodes in the cluster .
// keeps gossip in sync w/ what we just told everyone