void init(JobConf jconf, AbstractMapOperator mapOp, KeyValueReader reader) throws IOException { execContext = mapOp.getExecContext(); this.mapOp = mapOp; if (reader instanceof KeyValueInputMerger) { KeyValueInputMerger kvMerger = (KeyValueInputMerger) reader; kvMerger.setIOCxt(execContext.getIoCxt()); } this.reader = reader; }