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https://issues.apache.org/jira/browse/YARN-3041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14323157#comment-14323157
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Naganarasimha G R commented on YARN-3041:
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# After having HierarchicalTimelineEntity do we require isRelatedToEntities &
relatesToEntities in TimelineEntity or vice versa?
{quote}
private Set<TimelineEntity> isRelatedToEntities = new HashSet<>();
private Set<TimelineEntity> relatesToEntities = new HashSet<>();
{quote}
# If any Entity data cannot be updated on subsequent posts of time line
Entities better to capture it before hand. for example
if we are inserting configs of timeline entity only during creation of new
TimelineEntity...
# Regarding metrics ; TimelineEntity has set of TimelineMetric and
TimelineMetric has
{quote}
private String id;
private Map<String, Object> info = new HashMap<>();
private Object singleData;
private Map<Long, Object> timeSeries = new LinkedHashMap<>();
{quote}
#* whats the purpose of info ? can we name it as metadata ?
#* Are all objects stored in backend by serialization and deserialization or as
json strings ?
#* If metric value is object then how aggregations (primary) are done ? is info
responsible for capturing this information?
#* IIUC if time series metric then {{singleData}} will be null and
{{timeSeries}} will have values and if its non time series then vice versa.
> [Data Model] create the ATS entity/event API
> --------------------------------------------
>
> Key: YARN-3041
> URL: https://issues.apache.org/jira/browse/YARN-3041
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Sangjin Lee
> Assignee: Zhijie Shen
> Attachments: Data_model_proposal_v2.pdf, YARN-3041.2.patch,
> YARN-3041.preliminary.001.patch
>
>
> Per design in YARN-2928, create the ATS entity and events API.
> Also, as part of this JIRA, create YARN system entities (e.g. cluster, user,
> flow, flow run, YARN app, ...).
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