使用Java API在Hadoop中移动文件? [英] Moving files in Hadoop using the Java API?
问题描述
我想使用Java API在HDFS中移动文件。我无法想出办法做到这一点。 FileSystem类似乎只想允许移入和移出本地文件系统......但我想将它们保存在HDFS中并将它们移动到那里。
我错过了一些基本的东西吗?我能想到的唯一方法就是从输入流中读取它并将其写回...然后删除旧副本(yuck)。
谢谢
public abstract boolean rename(Path src,Path dst)throws IOException
code>将Path
src
重命名为Pathdst
。可以在本地fs或远程DFS上进行。
参数:
src code> - 要重命名的路径
dst
- 重命名后的新路径
返回: strong>
true
如果重命名成功
抛出:
IOException - 失败时
I want to move files around in HDFS using the Java APIs. I cannot figure out a way to do this. The FileSystem class only seems to want to allow moving to and from the local file system.. but I want to keep them in HDFS and move them there.
Am I missing something basic? The only way I can figure to do it is to read it from the input stream and write it back out... and then delete the old copy (yuck).
thanks
Use FileSystem.rename():
public abstract boolean rename(Path src, Path dst) throws IOException
Renames Path
src
to Pathdst
. Can take place on local fs or remote DFS.Parameters:
src
- path to be renamed
dst
- new path after rename
Returns:
true
if rename is successful
Throws:
IOException - on failure
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