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From "jiraposter@reviews.apache.org (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4213) Support for fault tolerant, instant schema updates with out master's intervention (i.e with out enable/disable and bulk assign/unassign) through ZK.
Date Mon, 12 Sep 2011 23:59:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103198#comment-13103198
] 

jiraposter@reviews.apache.org commented on HBASE-4213:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/1786/#review1863
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/src/main/java/org/apache/hadoop/hbase/zookeeper/SchemaChangeTracker.java
<https://reviews.apache.org/r/1786/#comment4261>

    Javadoc should explain the role of this class.



/src/main/java/org/apache/hadoop/hbase/zookeeper/SchemaChangeTracker.java
<https://reviews.apache.org/r/1786/#comment4262>

    I think this should be: ... SchemaChangeTracker


- Ted


On 2011-09-12 18:36:02, Ted Yu wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/1786/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2011-09-12 18:36:02)
bq.  
bq.  
bq.  Review request for hbase.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  From Subbu:
bq.  here is the latest patch that support alter_instant, an instant schema change command
that supports (Add, Modify, Delete column and Modify table) actions through ZK.
bq.  
bq.  1. This pattern capitalizes on the fact that HRI's are now in HDFS and need not be sent
over again from Master to RS cloud on every schema change event.
bq.  
bq.  2. Offers real time instant schema change as we bypass the explicit bulk reassign (unassign
+ assign) of regions from master to RS.
bq.  
bq.  3. Offers fault tolerant schema change support as schema changes now go through ZK. Secondary
master taking over a failed schema change will be addressed through a separate JIRA.
bq.  
bq.  
bq.  This addresses bug HBASE-4213.
bq.      https://issues.apache.org/jira/browse/HBASE-4213
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    /src/main/java/org/apache/hadoop/hbase/avro/AvroServer.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/executor/EventHandler.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/ipc/HMasterInterface.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/master/HMaster.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/master/MasterServices.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/master/handler/DeleteTableHandler.java 1169522

bq.    /src/main/java/org/apache/hadoop/hbase/master/handler/ModifyTableHandler.java 1169522

bq.    /src/main/java/org/apache/hadoop/hbase/master/handler/TableAddFamilyHandler.java 1169522

bq.    /src/main/java/org/apache/hadoop/hbase/master/handler/TableDeleteFamilyHandler.java
1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/master/handler/TableEventHandler.java 1169522

bq.    /src/main/java/org/apache/hadoop/hbase/master/handler/TableModifyFamilyHandler.java
1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/OnlineRegions.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/rest/SchemaResource.java 1169522 
bq.    /src/main/java/org/apache/hadoop/hbase/zookeeper/MasterSchemaChangeTracker.java PRE-CREATION

bq.    /src/main/java/org/apache/hadoop/hbase/zookeeper/SchemaChangeTracker.java PRE-CREATION

bq.    /src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java 1169522 
bq.    /src/main/ruby/hbase/admin.rb 1169522 
bq.    /src/main/ruby/shell.rb 1169522 
bq.    /src/test/java/org/apache/hadoop/hbase/client/TestAdmin.java 1169522 
bq.    /src/test/java/org/apache/hadoop/hbase/client/TestFromClientSide.java 1169522 
bq.    /src/test/java/org/apache/hadoop/hbase/client/TestInstantSchemaChange.java PRE-CREATION

bq.    /src/test/java/org/apache/hadoop/hbase/coprocessor/TestMasterObserver.java 1169522

bq.    /src/test/java/org/apache/hadoop/hbase/master/TestCatalogJanitor.java 1169522 
bq.    /src/test/java/org/apache/hadoop/hbase/regionserver/handler/MockRegionServerServices.java
1169522 
bq.  
bq.  Diff: https://reviews.apache.org/r/1786/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  Unit tests pass.
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Ted
bq.  
bq.



> Support for fault tolerant, instant schema updates with out master's intervention (i.e
with out enable/disable and bulk assign/unassign) through ZK.
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4213
>                 URL: https://issues.apache.org/jira/browse/HBASE-4213
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Subbu M Iyer
>            Assignee: Subbu M Iyer
>             Fix For: 0.92.0
>
>         Attachments: 4213-Instant_Schema_change_through_ZK.patch, 4213-V5-Support_instant_schema_changes_through_ZK.patch,
4213.v6, HBASE-4213-Instant_schema_change.patch, HBASE-4213_Instant_schema_change_-Version_2_.patch,
HBASE_Instant_schema_change-version_3_.patch
>
>
> This Jira is a slight variation in approach to what is being done as part of 
> https://issues.apache.org/jira/browse/HBASE-1730
> Support instant schema updates such as Modify Table, Add Column, Modify Column operations:
> 1. With out enable/disabling the table.
> 2. With out bulk unassign/assign of regions.

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