@Override public void init(SortedKeyValueIterator<Key,Value> source, Map<String,String> options, IteratorEnvironment env) throws IOException { super.init(source, options, env); parseOptions(options); parseScope(env); summer = new SummingCombiner(); IteratorSetting itset = new IteratorSetting(1, SummingCombiner.class); SummingCombiner.setCombineAllColumns(itset, true); SummingCombiner.setEncodingType(itset, LongCombiner.Type.STRING); summer.init(null, itset.getOptions(), env); }