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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3909) Add dynamic config
Date Thu, 14 Jun 2012 19:49:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295267#comment-13295267
] 

stack commented on HBASE-3909:
------------------------------

bq.  My understanding is that all configuration properties will be/must be defined in hbase-default.xml
with a default value. Some exceptions are possible in some corner cases but majority of properties
must be defined here.

IMO, on #1 in your first of two comments above Subbu, there are configs. that are do not have
to be in hbase-default.  Such configs. are those we think we'd never change but that we've
made configurable just-in-case.  This class of config can only be found by reading source
code.  We don't add them to hbase-default.xml because they detract from the important configs.
in the flat hbase-default xml file (Maybe this is less of an issue now we 'hide' hbase-default.xml
inside the jar and the book includes description).   If we do add these to hbase-default.xml,
I'd think we'd add an annotation saying like 'exotic' or 'not-for-the-faint-of-heart').

On #2, I think its fine that they have to read the source for esoterics.

On your second set of comments, I think yes, this is an important feature to have and I agree
many configs. will not be changeable without extensive refactoring server-side (and even then,
some may be just plain dangerous to change in mid-flight).  Perhaps we do a subset in this
case and if you stray outside of the subset, you get an exception.





                
> Add dynamic config
> ------------------
>
>                 Key: HBASE-3909
>                 URL: https://issues.apache.org/jira/browse/HBASE-3909
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.96.0
>
>         Attachments: 3909-v1.patch, 3909.v1, HBase Cluster Config Details.xlsx, patch-v2.patch
>
>
> I'm sure this issue exists already, at least as part of the discussion around making
online schema edits possible, but no hard this having its own issue.  Ted started a conversation
on this topic up on dev and Todd suggested we lookd at how Hadoop did it over in HADOOP-7001

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