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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-1730) Near-instantaneous online schema and table state updates
Date Sat, 03 Sep 2011 05:17:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096582#comment-13096582
] 

Hudson commented on HBASE-1730:
-------------------------------

Integrated in HBase-TRUNK #2175 (See [https://builds.apache.org/job/HBase-TRUNK/2175/])
    HBASE-1730 Online schema changes for HBase

nspiegelberg : 
Files : 
* /hbase/trunk/CHANGES.txt
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/executor/EventHandler.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/ipc/HMasterInterface.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/BulkReOpen.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/handler/ClosedRegionHandler.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/handler/TableAddFamilyHandler.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/handler/TableEventHandler.java
* /hbase/trunk/src/main/ruby/hbase/admin.rb
* /hbase/trunk/src/main/ruby/shell.rb
* /hbase/trunk/src/main/ruby/shell/commands/alter.rb
* /hbase/trunk/src/main/ruby/shell/commands/alter_async.rb
* /hbase/trunk/src/main/ruby/shell/commands/alter_status.rb
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/client/TestAdmin.java


> Near-instantaneous online schema and table state updates
> --------------------------------------------------------
>
>                 Key: HBASE-1730
>                 URL: https://issues.apache.org/jira/browse/HBASE-1730
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>            Assignee: Nicolas Spiegelberg
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: 1730-v2.patch, 1730-v3.patch, 1730.patch, HBASE-1730-2.patch, HBASE-1730.patch
>
>
> We should not need to take a table offline to update HCD or HTD. 
> One option for that is putting HTDs and HCDs up into ZK, with mirror on disk catalog
tables to be used only for cold init scenarios, as discussed on IRC. In this scheme, regionservers
hosting regions of a table would watch permanent nodes in ZK associated with that table for
schema updates and take appropriate actions out of the watcher. In effect, schema updates
become another item in the ToDo list.
> {{/hbase/tables/<table-name>/schema}}
> Must be associated with a write locking scheme also handled with ZK primitives to avoid
situations where one concurrent update clobbers another. 

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