@Override
  protected void toStringClassDetails(StringBuilder builder) {
    builder.append(getClass().getSimpleName()).append(", snapshot=").append(snapshot.getName());
    if (targetServer != null) {
      builder.append(", targetServer=").append(targetServer);
    }
  }
A remote procedure which is used to send verify snapshot request to region server.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/SnapshotVerifyProcedure.java