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Posted to issues@hbase.apache.org by "stack (Commented) (JIRA)" <ji...@apache.org> on 2012/04/03 00:47:22 UTC
[jira] [Commented] (HBASE-5335) Dynamic Schema Configurations
[ https://issues.apache.org/jira/browse/HBASE-5335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244780#comment-13244780 ]
stack commented on HBASE-5335:
------------------------------
Can you make a patch for trunk Nicolas. Lets get this in.....
Should you doc this new behavior:
{code}
+ if (value == null) {
+ remove(Bytes.toBytes(key));
{code}
Should this be hasReservedKeywords rather than hasAdvancedKeys?
{code}
+ if (!RESERVED_KEYWORDS.contains(k)) {
+ hasAdvancedKeys = true;
{code}
Yeah, whats ADVANCED vs RESERVER_KEYWORDS?
> 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, 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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