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From "Li Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3914) Entity created time should be part of the row key of entity table
Date Mon, 18 Jul 2016 20:11:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-3914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15382970#comment-15382970
] 

Li Lu commented on YARN-3914:
-----------------------------

I'm checking through the JIRA list of YARN-5355 and saw this. Right now the schema of HBase
tables are pretty much finalized, right? Personally I'd prefer the current way since it supports
much easier query for (entityID, entityType). Also, determining the "start time" of a timeline
entity is error pruning (something like YARN-5340, we spent quite a while to accurately locate
the problem). 

My question here is, given the fact that this issue has been hanging for a year, shall we
close it or work out some alternative solutions? 

> Entity created time should be part of the row key of entity table
> -----------------------------------------------------------------
>
>                 Key: YARN-3914
>                 URL: https://issues.apache.org/jira/browse/YARN-3914
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>              Labels: YARN-5355
>
> Entity created time should be part of the row key of entity table, between entity type
and entity Id. The reason to have it is to index the entities. Though we cannot index the
entities for all kinds of information, indexing them according to the created time is very
necessary. Without it, every query for the latest entities that belong to an application and
a type will scan through all the entities that belong to them. For example, if we want to
list the 100 latest started containers in an YARN app.



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