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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3909) Add dynamic config
Date Sat, 21 May 2011 05:02:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037265#comment-13037265
] 

Todd Lipcon commented on HBASE-3909:
------------------------------------

I'm always skeptical of the suggestion to store configuration in ZooKeeper. Here's my reasoning:

- we already require at least one piece of configuration in the client itself in order to
connect to ZooKeeper (ie the ZK quorum info and session timeouts, etc)
- operations teams are very good at managing text-based configuration files with tools like
puppet, cfengine, etc. It's also easy to version-control these kinds of configs, add <!--
comments -->, etc. Moving to ZK makes these tasks more difficult -- we'd need lots of tooling,
etc.
- If we keep both the text-based and ZK-based, it's easy to accidentally change something
in ZK but forget to update in text, so it would revert on next restart.
- we currently have the somewhat nice property that nothing in ZK is "critical" - even if
the ZK cluster is completely wiped out, we dont lose any info. This would be a change.

> Add dynamic config
> ------------------
>
>                 Key: HBASE-3909
>                 URL: https://issues.apache.org/jira/browse/HBASE-3909
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>
> 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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