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From "Nicolas Spiegelberg (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5335) Dynamic Schema Configurations
Date Wed, 08 Feb 2012 03:43:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203233#comment-13203233
] 

Nicolas Spiegelberg commented on HBASE-5335:
--------------------------------------------

@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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