Okay, I see that the ATS puts the logs in /ats/done directory in HDFS and this is configured by property yarn.timeline-service.entity-group-fs-store.done-dir 1. What is the difference between  org.apache.hadoop.yarn.server.timeline.LeveldbTimelineStore and  org.apache.hadoop.yarn.server.timeline.EntityGroupFSTimelineStore ? Does the ATS generate logs in path /ats/done only if  yarn.timeline-service.entity-group-fs-store.summary-store is set to the EntityGroupFSTimelineStore ?  2. Do all three versions of the Application Timeline Server (1.0, 1.5, 2.0) generate logs in /ats/done or there is a difference in versions? 3. For some executed queries, I see that only single entity, summary logs get generated whereas for other executed queries I see multiple entity, summary logs getting generated. Is there any structure to this? Like when do we expect a single entity or summary logs or multiple? TIA ... View more