public java.lang.String getDesiredMasterVersion() {
    java.lang.Object ref = desiredMasterVersion_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      desiredMasterVersion_ = s;
      return s;
    }
  }
public java . lang . String getDesiredMasterVersion ( ) { java . lang . Object ref = desiredMasterVersion_ ; if ( ref instanceof java . lang . String ) { return ( java . lang . String ) ref ; } else { com . google . protobuf . ByteString bs = ( com . google . protobuf . ByteString ) ref ; java . lang . String s = bs . toStringUtf8 ( ) ; desiredMasterVersion_ = s ; return s ; } }
<pre>
The Kubernetes version to change the master to.
Users may specify either explicit versions offered by
Kubernetes Engine or version aliases, which have the following behavior:
- "latest": picks the highest valid Kubernetes version
- "1.X": picks the highest valid patch+gke.N patch in the 1.X version
- "1.X.Y": picks the highest valid gke.N patch in the 1.X.Y version
- "1.X.Y-gke.N": picks an explicit Kubernetes version
- "-": picks the default Kubernetes version
</pre>

<code>string desired_master_version = 100;</code>