将一个远程文件放入hadoop而不复制到本地磁盘 [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，在数据生成后立即将数据放入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。以更好地解释我需要什么，下面你可以找到我到目前为止：
$ b $ 1）将文件复制到主节点的本地磁盘：

  scp test.txt用户名@ masternode：/文件夹名称/ 
  

我已经使用密钥设置了SSH连接。因此，不需要密码来执行此操作。

2）我可以使用ssh远程执行hadoop put命令：

  ssh username @ masternodehadoop dfs -put /folderName/test.txt hadoopFolderName /
  

我正在寻找的是如何将这两个步骤合并/合并为一个，并跳过masterNode本地磁盘上的本地副本。

感谢

换句话说，我想以某种方式输入几个命令，我可以

解决方案

试试这个（未经测试）：

  cat test.txt | ssh username @ masternodehadoop dfs -put-hadoopFoldername /
  

我使用了类似的技巧来复制目录周围：

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

本地 - tar 放入远程输入 - tar 。

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

scp test.txt username@masternode:/folderName/

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

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

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

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.

thanks

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

解决方案

Try this (untested):

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

I've used similar tricks to copy directories around:

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

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

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