stack commented on HBASE-16134:

When do we ever want to emit tags? When debugging?

WAL write time is 'write time' so when Cell comes in the front door, we use a 
write-time Cell that will include tags when we call write. Otherwise, when we 
pull from hfile, we use a Cell type that does not include tags?  If debug, pass 
a flag and then use a different Cell type, one that will do debug things 
including emitting Tags?

> Introduce Cell extension for server side.
> -----------------------------------------
>                 Key: HBASE-16134
>                 URL: https://issues.apache.org/jira/browse/HBASE-16134
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0
>         Attachments: HBASE-16134.patch, HBASE-16134.patch, 
> HBASE-16134_V2.patch
> Came after the discussion under HBASE-15721 and HBASE-15879.
> InternalCell is a Cell extension. We do have Cell extensions across different 
> interfaces now.
> SettableSeqId
> SettableTimestamp
> Streamable.
> And demand for this keep growing.
> So let us include everything into one Interface.

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