Vrushali C created YARN-4025:

             Summary: Deal with byte representations of Longs in writer code
                 Key: YARN-4025
                 URL: https://issues.apache.org/jira/browse/YARN-4025
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Vrushali C
            Assignee: Vrushali C

Timestamps are being stored as Longs in hbase by the HBaseTimelineWriterImpl 
code. There seem to be some places in the code where there are conversions 
between Long to byte[] to String for easier argument passing between function 
calls. Then these values end up being converted back to byte[] while storing in 

It would be better to pass around byte[] or the Longs themselves  as 

This may result in some api changes (store function) as well in adding a few 
more function calls like getColumnQualifier which accepts a pre-encoded byte 
array. It will be in addition to the existing api which accepts a String and 
the ColumnHelper to return a byte[] column name instead of a String one. 

Filing jira to track these changes.

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