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【多选题】
有人改进了MapReduce的架构，Map函数的输出不写入本地磁盘，而是直接（通过网络）传递给Reduce任务，reduce任务收到所有Map的输入后，再开始Reduce的处理。关于这种改动，以下说法正确的是( )。A.
在某些情况下，整个任务的完成时间会缩短
B.
这种改动大大降低了 MapReduce 的容错性
C.
在没有错误的情况下，有时任务完成时间也会延长
D.
经过这样的改动， reduce 就不需要对输入进行专门的排序了，大大提升了系统运行效率（没有错误的情况下）
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