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