将远程文件放入 hadoop 而不将其复制到本地磁盘 [英] putting a remote file into hadoop without copying it to local disk

问题描述

我正在编写一个 shell 脚本，以便在生成数据后立即将其放入 hadoop.我可以 ssh 到我的主节点，将文件复制到那里的文件夹，然后将它们放入 hadoop.我正在寻找一个 shell 命令来摆脱将文件复制到主节点上的本地磁盘.为了更好地解释我需要什么，您可以在下面找到我目前所拥有的:

I am writing a shell script to put data into hadoop as soon as they are generated. I can ssh to my master node, copy the files to a folder over there and then put them into hadoop. I am looking for a shell command to get rid of copying the file to the local disk on master node. to better explain what I need, here below you can find what I have so far:

1) 将文件复制到主节点的本地磁盘:

1) copy the file to the master node's local disk:

scp test.txt username@masternode:/folderName/

我已经使用密钥建立了 SSH 连接.因此无需密码即可执行此操作.

I have already setup SSH connection using keys. So no password is needed to do this.

2) 我可以使用 ssh 远程执行 hadoop put 命令:

2) I can use ssh to remotely execute the hadoop put command:

ssh username@masternode "hadoop dfs -put /folderName/test.txt hadoopFolderName/"

我正在寻找的是如何将这两个步骤通过管道/组合成一个步骤并跳过 masterNode 本地磁盘上文件的本地副本.

what I am looking for is how to pipe/combine these two steps into one and skip the local copy of the file on masterNode's local disk.

谢谢

换句话说，我想以一种我可以的方式传递几个命令

In other words, I want to pipe several command in a way that I can

推荐答案

试试这个(未经测试):

Try this (untested):

cat test.txt | ssh username@masternode "hadoop dfs -put - hadoopFoldername/test.txt"

我使用了类似的技巧来复制目录:

I've used similar tricks to copy directories around:

tar cf - . | ssh remote "(cd /destination && tar xvf -)"

这会将 local-tar 的输出发送到 remote-tar 的输入中.

This sends the output of local-tar into the input of remote-tar.

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