The release of HDP 2.3.4 offers a newer version of the ATS which is version 1.5. Part of configuring this new ATS version includes providing the following property if Tez is used: <property> <name>yarn.timeline-service.entity-group-fs-store.group-id-plugin-classes</name> <value>org.apache.tez.dag.history.logging.ats.TimelineCachePluginImpl</value> <description>Plugins that can translate a timeline entity read request into a list of timeline cache ids, separated by commas. </description> </property> If this property is included but the tez-client is not present, a message will be seen in the ATS log stating ClassNotFound and the ATS server will fail shortly after issuing a startup. The full documentation for configuring ATS 1.5 is located here: http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.4/bk_yarn_resource_mgt/content/ch08s02.html A documentation bug has been filed as the only reference to this in the configuration section is this: "The Tez cache plugin class must be in the timeline server’s classpath." ... View more