Sangjin Lee commented on YARN-4053:

Thanks [~varun_saxena] for pointing out an important issue. I would agree with 
[~gtCarrera9] that this is bit lower in priority compared to YARN-3814, but 
it's an important issue nonetheless.

I'm just curious (and perhaps this is a totally dumb question for a HBase 
newbie), is there a way to specify that the value type is a numeric type when 
we create the table or the column family? Does HBase itself support something 
like that?

> Change the way metric values are stored in HBase Storage
> --------------------------------------------------------
>                 Key: YARN-4053
>                 URL: https://issues.apache.org/jira/browse/YARN-4053
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>         Attachments: YARN-4053-YARN-2928.01.patch
> Currently HBase implementation uses GenericObjectMapper to convert and store 
> values in backend HBase storage. This converts everything into a string 
> representation(ASCII/UTF-8 encoded byte array).
> While this is fine in most cases, it does not quite serve our use case for 
> metrics. 
> So we need to decide how are we going to encode and decode metric values and 
> store them in HBase.

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