| Package | Description | 
|---|---|
| org.apache.hadoop.yarn.server.timelineservice.collector | Package org.apache.hadoop.yarn.server.timelineservice.collector contains
 classes which can be used across collector. | 
| org.apache.hadoop.yarn.server.timelineservice.reader | Package org.apache.hadoop.yarn.server.timelineservice.reader contains classes
 which can be used across reader. | 
| org.apache.hadoop.yarn.server.timelineservice.storage | Package org.apache.hadoop.yarn.server.timelineservice.storage contains
 classes which define and implement reading and writing to backend storage. | 
| Class and Description | 
|---|
| TimelineWriter This interface is for storing application timeline information. | 
| Class and Description | 
|---|
| TimelineAggregationTrack specifies the tracks along which an entity
 info is to be aggregated on. | 
| TimelineReader ATSv2 reader interface. | 
| TimelineReader.Field Possible fields to retrieve for  TimelineReader.getEntities(org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderContext, org.apache.hadoop.yarn.server.timelineservice.reader.TimelineEntityFilters, org.apache.hadoop.yarn.server.timelineservice.reader.TimelineDataToRetrieve)andTimelineReader.getEntity(org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderContext, org.apache.hadoop.yarn.server.timelineservice.reader.TimelineDataToRetrieve). | 
| TimelineStorageMonitor.Storage Different Storages supported by ATSV2. | 
| TimelineWriter This interface is for storing application timeline information. | 
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