Installing Python2 on the Impala Client

Issue

Error information similar to the following is displayed when a user runs the Impala client.

Cause Analysis

The latest MRS cluster uses EulerOS 2.9 or later, which provides only Python 3. However, the Impala client is implemented based on Python 2 and is incompatible with some syntax of Python 3. As a result, an error occurs when the Impala client is running. You can manually install Python 2 to solve this problem.

Procedure

1. Log in to the Impala node as user root and run the following command to check its Python version:

   python --version

   

2. Run the yum install make command to check whether yum is available.
   • If the following error is reported, the yum configuration is incorrect. Go to 3.

     

   • If no error is reported, go to 4.

3. Run the cat /etc/yum.repos.d/EulerOS-base.repo command to check whether the yum source matches the system version. If they do not match, modify them.

   Before modification

   

   After modification

   

4. Run the following command to check for the software whose name starts with python2 in the yum source:

   yum list python2*

   

5. Run the following command to install Python 2:

   yum install python2

   

   Python 3 has been installed in the current system. If you directly install Python 2, a conflict message is displayed.

   You can select --allowerasing or --skip-broken for the installation. For example:

   yum install python2 --skip-broken

   

   After the installation is complete, the Python version is automatically changed to python2, as shown in the following figure.

   

   If Python 2 is installed successfully but the displayed Python version is incorrect, run the following command to create the /usr/bin/python soft link for /usr/bin/python2:

   ln -s /usr/bin/python2 /usr/bin/python

6. Verify that the Impala client is available.