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From "Ted Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4554) Allow set/unset arbitrary table attributes from shell.
Date Fri, 07 Oct 2011 21:56:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123241#comment-13123241
] 

Ted Yu commented on HBASE-4554:
-------------------------------

This would be a useful feature.
COPROCESSOR$1 needs to be defined as a constant if we follow example from src/main/ruby/hbase/admin.rb:
{code}
       if method == "table_att"
          htd.setMaxFileSize(JLong.valueOf(arg[MAX_FILESIZE])) if arg[MAX_FILESIZE]
{code}
I think table_att method targets known table attributes.
For HBASE-4554, we can introduce new method, e.g. table_dyn_att, which accepts two parameters:
KEY and VALUE:
{code}
hbase> alter 't1', {METHOD => 'table_dyn_att', KEY => 'COPROCESSOR$1', VALUE =>
'hdfs://cp/foo.jar|org.apache.hadoop.hbase.sample|1|' }
{code}
                
> Allow set/unset arbitrary table attributes from shell.
> ------------------------------------------------------
>
>                 Key: HBASE-4554
>                 URL: https://issues.apache.org/jira/browse/HBASE-4554
>             Project: HBase
>          Issue Type: Improvement
>          Components: coprocessors
>            Reporter: Mingjie Lai
>            Assignee: Mingjie Lai
>             Fix For: 0.92.0
>
>
> Table/region level coprocessor -- RegionObserver -- can be configured by setting a HTD's
attribute which matches Coprocessor$*. 
> Current shell -- alter -- cannot support to set/unset a table's arbitrary attribute.
We need it in order to configure region level coprocessors to a table. 
> Proposed new shell:
> {code}
> hbase shell > alter 't1', METHOD => 'table_att', COPROCESSOR$1 => 'hdfs://cp/foo.jar|org.apache.hadoop.hbase.sample|1|'
> hbase shell > describe 't1'
>  {NAME => 't1', COPROCESSOR$1 => 'hdfs://cp/foo.jar|org.apache.hadoop.hbase.sample|1|',
MAX_FILESIZE => '134217728', ...}
> hbase shell > alter 't1', METHOD => 'table_att_unset', COPROCESSOR$1
> hbase shell > describe 't1'
>  {NAME => 't1', MAX_FILESIZE => '134217728', ...}
> {code}

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