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https://issues.apache.org/jira/browse/HBASE-5335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203233#comment-13203233
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Nicolas Spiegelberg commented on HBASE-5335:
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@stack: that's true, but you'd need to do a large refactor to handle truly
online configuration transitions. we'd also need to add in locking primitives
for all config params. this is a good long-term goal, but the strategy
mentioned here would have almost no downtime and very little code change. Note
that, with your region server draining, you can change global config values in
an online fashion on a per-server basis by issuing a 'regionserver restart
--draining' or something like that.
> Dynamic Schema Configurations
> -----------------------------
>
> Key: HBASE-5335
> URL: https://issues.apache.org/jira/browse/HBASE-5335
> Project: HBase
> Issue Type: New Feature
> Reporter: Nicolas Spiegelberg
> Assignee: Nicolas Spiegelberg
> Labels: configuration, schema
>
> Currently, the ability for a core developer to add per-table & per-CF
> configuration settings is very heavyweight. You need to add a reserved
> keyword all the way up the stack & you have to support this variable
> long-term if you're going to expose it explicitly to the user. This has
> ended up with using Configuration.get() a lot because it is lightweight and
> you can tweak settings while you're trying to understand system behavior
> [since there are many config params that may never need to be tuned]. We
> need to add the ability to put & read arbitrary KV settings in the HBase
> schema. Combined with online schema change, this will allow us to safely
> iterate on configuration settings.
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