摘要：
MapTask类 在MapTask类中找到run函数 if(useNewApi){ runNewMapper(job, splitMetaInfo, umbilical, reporter); } 再找到runNewMapper @SuppressWarnings("unchecked") priv 阅读全文
摘要：
Job类 /** * Define the comparator that controls which keys are grouped together * for a single call to * {@link Reducer#reduce(Object, Iterable, * org. 阅读全文
摘要：
Job类 /** * Define the comparator that controls * how the keys are sorted before they * are passed to the {@link Reducer}. * @param cls the raw compara 阅读全文