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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3256) Coprocessors: Coprocessor host and observer for HMaster
Date Mon, 22 Nov 2010 20:13:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934581#action_12934581

Gary Helmling commented on HBASE-3256:

Some additional details on the code changes here:

# add a {{org.apache.hadoop.hbase.coprocessor.MasterObserver}} interface defining pre/post
methods for createTable, deleteTable, modifyTable, addColumn, modifyColumn, deleteColumn,
enable/disable, move, balance, and shutdown
# extract a common base class from the current {{org.apache.hadoop.hbase.regionserver.CoprocessorHost}}
to {{org.apache.hadoop.hbase.coprocessor.CoprocessorHost}}
# rename the existing region-specific {{org.apache.hadoop.hbase.regionserver.CoprocessorHost}}
to {{RegionCoprocessorHost}}
# add a new {{org.apache.hadoop.hbase.master.MasterCoprocessorHost}} for HMaster integration
# refactor the current {{org.apache.hadoop.hbase.coprocessor.CoprocessorEnvironment}} into
a base interface with {{RegionCoprocessorEnvironment}} and {{MasterCoprocessorEnvironment

> Coprocessors: Coprocessor host and observer for HMaster
> -------------------------------------------------------
>                 Key: HBASE-3256
>                 URL: https://issues.apache.org/jira/browse/HBASE-3256
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Andrew Purtell
>            Assignee: Gary Helmling
>             Fix For: 0.92.0
> Implement a coprocessor host for HMaster. Hook observers into administrative operations
performed on tables: create, alter, assignment, load balance, and allow observers to modify
base master behavior. Support automatic loading of coprocessor implementation. 
> Consider refactoring the master coprocessor host and regionserver coprocessor host into
a common base class. 

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