// Static Map object to store the ID and name relationship of an employee.
// If a session uses multiple partitions, empMap is shared across all partitions.
private static Map <Integer, String> empMap = new HashMap <Integer, String> ();

// Static lock object to synchronize the access to empMap across partitions.
private static Object lock = new Object();

// Boolean to track whether to generate an output row based on validity of the
// input data.
private boolean generateRow;

// Boolean to track whether the employee is root.
private boolean isRoot;