9. Tools and Troubleshooting : Troubleshooting and Log Files : Hortonworks and Hadoop Client Installation
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Hortonworks and Hadoop Client Installation
If using Hortonworks, some versions of Ambari do not install some of the required JAR files on all DataNodes. Correct operation requires the Hadoop Client and Hadoop DataNode JARs to be installed.
The following command should return details similar to the following:
rpm -aq | grep hadoop | grep "client\|datanode"
If these JARs are not installed on your installation by default, install them manually.