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https://issues.apache.org/jira/browse/HBASE-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack reassigned HBASE-2960:
----------------------------
Assignee: Karthick Sankarachary
I made you a contributor karthick and assigned this issue to you.
> Allow Incremental Table Alterations
> -----------------------------------
>
> Key: HBASE-2960
> URL: https://issues.apache.org/jira/browse/HBASE-2960
> Project: HBase
> Issue Type: Wish
> Components: client
> Affects Versions: 0.89.20100621
> Reporter: Karthick Sankarachary
> Assignee: Karthick Sankarachary
> Attachments: HBASE-2960.patch
>
>
> As per the HBase shell help, the alter command will "Alter column family
> schema; pass table name and a dictionary specifying new column family
> schema." The assumption here seems to be that the new column family schema
> must be completely specified. In other words, if a certain attribute is not
> specified in the column family schema, then it is effectively defaulted. Is
> this side-effect by design?
> I for one assumed (wrongly apparently) that I can alter a table in
> "increments". Case in point, the following commands should've resulted in the
> final value of the VERSIONS attribute of my table to stay put at 1, but
> instead it got defaulted to 3. I guess there's no right or wrong answer here,
> but what should alter do by default? My expectation is that it only changes
> those attributes that were specified in the "alter" command, leaving the
> unspecified attributes untouched.
> hbase(main):003:0> create 't1', {NAME => 'f1', VERSIONS => 1}
> 0 row(s) in 1.7230 seconds
> hbase(main):004:0> describe 't1'
> DESCRIPTION
> {NAME => 't1', FAMILIES => [{NAME => 'f1', COMPRESSION => 'NONE', VERSIONS
> => '1', TTL => '2147483647', BLOCKSIZE => '65536', IN_MEMORY => ' false',
> BLOCKCACHE => 'true'}]}
> 1 row(s) in 0.2030 seconds
> hbase(main):006:0> disable 't1'
> 0 row(s) in 0.1140 seconds
> hbase(main):007:0> alter 't1', {NAME => 'f1', IN_MEMORY => 'true'}
> 0 row(s) in 0.0160 seconds
> hbase(main):009:0> describe 't1'
> DESCRIPTION
> {NAME => 't1', FAMILIES => [{NAME => 'f1', VERSIONS => '3', COMPRESSION =>
> 'NONE', TTL => '2147483647', BLOCKSIZE => '65536', IN_MEMORY => ' true',
> BLOCKCACHE => 'true'}]}
> 1 row(s) in 0.1280 seconds
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