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https://issues.apache.org/jira/browse/HBASE-10183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850958#comment-13850958
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Jeffrey Zhong commented on HBASE-10183:
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Andrew raised a good point that Java byte value range is [-128, 127]. Since we
use tag type in equal comparison, if we reserve 0-64 then a user tag could use
any value from range [-128,-1] and [65,127]. Reserving 0-31 as system range
should be also sufficient.
The problem here is how we can enforce the system range because our internal
code and client code both use same interface.
Option 1: The easiest option is to document what's the value range can be used
by clients
Option 2: Creating factory methods such as createUserTag and createSystemTag so
that it's easy for users to know
Any good suggestion? Thanks.
> Need enforce a reserved range of system tag types
> -------------------------------------------------
>
> Key: HBASE-10183
> URL: https://issues.apache.org/jira/browse/HBASE-10183
> Project: HBase
> Issue Type: Task
> Components: HFile
> Affects Versions: 0.98.0
> Reporter: Jeffrey Zhong
> Priority: Critical
> Fix For: 0.98.0
>
>
> If we don't reserve a system tag types now, let's say 0-64(total tag type
> range is 0-255). We'll have a hard time when introducing a new system tag
> type in the future because the new tag type may collide with an existing user
> tag type as tag is open to users as well.
> [~ram_krish], [~anoop.hbase] How do you guys think?
> Thanks!
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