please set $hadoop_mapred_home to the root of your hadoop mapreduce installa

tion.

To set the `hadoop_mapred_home` environment variable to the root of your Hadoop MapReduce installation, you can follow these steps:

1. Determine the location of your Hadoop MapReduce installation. This could be `/usr/local/hadoop` or another directory where Hadoop is installed.

2. Set the `hadoop_mapred_home` environment variable to the root of your Hadoop MapReduce installation by running the following command in your terminal:

   export hadoop_mapred_home=/path/to/hadoop

Replace `/path/to/hadoop` with the actual path to your Hadoop MapReduce installation.

3. To make this environment variable persistent across terminal sessions, you can add the above command to your shell profile file (e.g. `~/.bashrc` for Bash shell).

   echo 'export hadoop_mapred_home=/path/to/hadoop' >> ~/.bashrc
   source ~/.bashrc

Replace `/path/to/hadoop` with the actual path to your Hadoop MapReduce installation.