At @328:?<https://github.com/apache/hive/blob/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/mr/MapRedTask.java>
if (environmentVariables.get(HIVE_DEBUG_RECURSIVE).equals("y")) { // swap debug options in HADOOP_CLIENT_OPTS to those that the child JVM should have assert environmentVariables.containsKey(HIVE_CHILD_CLIENT_DEBUG_OPTS) && environmentVariables.get(HIVE_MAIN_CLIENT_DEBUG_OPTS) != null : HIVE_CHILD_CLIENT_DEBUG_OPTS? Thanks, ~Remus