@Override
    public String toString() {
      return " { " +
        "'" + field1 + '\'' +
        "," + field2 +
        ",'" + field3 + '\'' +
        " }";
    }
check that transactions that have not heartbeated and timedout get properly aborted

@throws Exception
streaming/src/test/org/apache/hive/streaming/TestStreaming.java