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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5335) Dynamic Schema Configurations
Date Sat, 04 Feb 2012 04:45:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13200330#comment-13200330
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Lars Hofhansl commented on HBASE-5335:
--------------------------------------

We were just discussing here at SFDC to add a generalized way to serialized Configurations
into a HTableDescriptor. What you propose is much cleaner than what we had in mind. So +1
:)

Are you planning some kind of classification theme to distinguish config settings that only
make sense globally from those that make sense per CF/Table?

Short term I was planning to add the ability to set arbitrary HTableDescriptor value through
the shell, I'll hold of on 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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