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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5335) Dynamic Schema Configurations
Date Sun, 08 Apr 2012 00:01:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249427#comment-13249427
] 

stack commented on HBASE-5335:
------------------------------

Did a quick scan.  +1 on commit (Its hard to look at this patch w/ fresh eyes. I've looked
at it a good few times already).  Tests look great.  Good stuff  Nicolas.   Lars, you want
this for 0.94?
                
> 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
>             Fix For: 0.96.0
>
>         Attachments: D2247.1.patch, D2247.2.patch, D2247.3.patch, D2247.4.patch, D2247.5.patch,
D2247.6.patch, D2247.7.patch, D2247.8.patch, HBASE-5335-trunk-2.patch, HBASE-5335-trunk-3.patch,
HBASE-5335-trunk-3.patch, HBASE-5335-trunk-4.patch, HBASE-5335-trunk.patch
>
>
> 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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