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From "Nicolas Spiegelberg (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5335) Dynamic Schema Configurations
Date Mon, 06 Feb 2012 15:41:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201351#comment-13201351

Nicolas Spiegelberg commented on HBASE-5335:

@Lars: the original idea was to allow users to arbitrarily set KVs in the HTableDescriptor
and HColumnDescriptor, but make it so users know that what they're doing is not checked. 
Need some sort of format to distinguish between reserved keywords and non-reserved (thinking
of doing this on the client side).  As a config value becomes more well-known, we can enforce
limitations like you stated.

I'd rather have this evolve by having a handful of users who want to set a config value, learn
over the long-term that this is useful, and incrementally refactor the code to ease support
for that config.  I don't want to get into a spot where we have to do a large refactor to
support this feature & do extensive sanity checking, only to determine that we only need
20% of the config values.
> 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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