Zhijie Shen commented on YARN-3908:

1. TimelineEvent has a timestamp associated with it. It tells us when the event 
happened. We should have this information persisted, but unfortunately it seems 

2. Metric doesn't have a timestamp because the timestamp is associated with 
each individual value.

3. I also realized that the metric type is not persisted too. Now I just assume 
if size(metric) > 1 => time series, else => single value in reader 
implementation. But it may not be guaranteed.

> Bugs in HBaseTimelineWriterImpl
> -------------------------------
>                 Key: YARN-3908
>                 URL: https://issues.apache.org/jira/browse/YARN-3908
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Vrushali C
> 1. In HBaseTimelineWriterImpl, the info column family contains the basic 
> fields of a timeline entity plus events. However, entity#info map is not 
> stored at all.
> 2 event#timestamp is also not persisted.

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