Sangjin Lee commented on YARN-4053:

And I do think that we need to support floating type values.

Another scenario to think about is what if users write metric values in an 
inconsistent manner. Suppose the user stored an integral value for a metric 
initially, but later attempted to store a floating value for the same metric. 
It sounds like it could be a silent failure? This should be a rare occurrence, 
but I think we need to give it some thought...

> 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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