hadoop fs -put 和 hadoop fs -copyFromLocal 的区别 [英] Difference between hadoop fs -put and hadoop fs -copyFromLocal
问题描述
-put
和 -copyFromLocal
记录为相同,而大多数示例使用详细变体 -copyFromLocal.为什么?
-put
and -copyFromLocal
are documented as identical, while most examples use the verbose variant -copyFromLocal. Why?
-get
和 -copyToLocal
推荐答案
-copyFromLocal
与 -put
命令类似,只是来源限制为本地文件引用.
-copyFromLocal
is similar to -put
command, except that the source is restricted to a local file reference.
所以基本上,你可以用 put 来做,所有你用 -copyFromLocal
做的事情,但反之亦然.
So basically, you can do with put, all that you do with -copyFromLocal
, but not vice-versa.
同样,
-copyToLocal
类似于 get 命令,除了目标仅限于本地文件引用.
-copyToLocal
is similar to get command, except that the destination is restricted to a local file reference.
因此,您可以使用 get 代替 -copyToLocal
,但不能反过来.
Hence, you can use get instead of -copyToLocal
, but not the other way round.
参考:Hadoop 的文档.
更新:有关截至 2015 年 10 月的最新信息,请参阅下面的此答案.
Update: For the latest as of Oct 2015, please see this answer below.
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