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There is a newer version: 3.8.2.9

package water.api;

import water.H2O;
import water.MRTask;
import water.util.Log;

public class LogAndEchoHandler extends Handler {
  @SuppressWarnings("unused") // called through reflection by RequestServer
  public LogAndEchoV3 echo(int version, final LogAndEchoV3 u) {
    new MRTask(H2O.MIN_HI_PRIORITY) { @Override public void setupLocal() { Log.info(u.message); } }.doAllNodes();
    return u;
  }
}