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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10950) Add a configuration point for MaxVersion of Column Family
Date Thu, 17 Apr 2014 21:51:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973461#comment-13973461
] 

Nick Dimiduk commented on HBASE-10950:
--------------------------------------

I'm suggesting a pattern more like other config access

{noformat}
public static final DEFAULT_VERSIONS = 1;
...
int myMaxVersions = conf.getInt("hbase.column.max.version", DEFAULT_VERSIONS);
{noformat}

However, looking at how DEFAULT_VERSIONS is used consumed in the codebase, it's mostly in
static initializers and not convenient for configuration override. For instance, it's use
in HColumnDescriptor(byte[]) isn't amiable to a local configuration context.

bq. They can just add it to hbase-site.xml and it will get parsed in won't it?

Yes, this is true for deployments. I'm thinking in mind of tests and other runtime scenarios
where it may be desirable to override this value. When the configs are read statically at
class load time, there's no opportunity to inject an override to this behavior.

In light of that, I revoke my objection to this approach.

Why is the test in package org.apache.hadoop.hbase.master.handler? I think it should be in
org.apache.hadoop.hbase. Test name should be Test*H*ColumnDescriptorDefaultVersions.

Cleanup those two nits and I think you're good to go.

> Add  a configuration point for MaxVersion of Column Family
> ----------------------------------------------------------
>
>                 Key: HBASE-10950
>                 URL: https://issues.apache.org/jira/browse/HBASE-10950
>             Project: HBase
>          Issue Type: Improvement
>          Components: Admin
>    Affects Versions: 0.98.0, 0.96.0
>            Reporter: Demai Ni
>            Assignee: Enoch Hsu
>             Fix For: 0.99.0, 0.98.2, 0.96.3
>
>         Attachments: HBASE_10950.patch, HBASE_10950_v2.patch
>
>
> Starting on 0.96.0.  HColumnDescriptor.DEFAULT_VERSIONS change to 1 from 3. So a columnfamily
will be default have 1 version of data. Currently a user can specifiy the maxVersion during
create table time or alter the columnfam later. This feature will add a configuration point
in hbase-sit.xml so that an admin can set the default globally. 
> a small discussion in [HBASE-10941|https://issues.apache.org/jira/browse/HBASE-10941]
lead to this jira



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