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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/MasterRewrite" by stack
Date Wed, 01 Sep 2010 18:55:49 GMT
Dear Wiki user,

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The "Hbase/MasterRewrite" page has been changed by stack.
http://wiki.apache.org/hadoop/Hbase/MasterRewrite?action=diff&rev1=16&rev2=17

--------------------------------------------------

  = Design Notes for Master Rewrite =
+ 
+ '''MOST OF THE BELOW HAS BEEN DONE BY [[https://issues.apache.org/jira/browse/HBASE-2692|HBASE-2692]].
 OUTSTANDING IS MOVING SCHEMA UP TO ZK. -- St.Ack 20100901'''
+ 
  Initial Master Rewrite design came of conversations had at the hbase hackathon held at StumbleUpon,
August 5-7, 2009 ([[https://issues.apache.org/jira/secure/attachment/12418561/HBase+Hackathon+Notes+-+Sunday.pdf|Jon
Gray kept notes]]).  The umbrella issue for the master rewrite is [[https://issues.apache.org/jira/browse/HBASE-1816|HBASE-1816]].
 Timeline is hbase 0.21.0.
  
  == Table of Contents ==
@@ -53, +56 @@

  
  <<Anchor(moveall)>>
  === Move all state, state transitions, and schema to go via zookeeper ===
+ 
+ '''STATE TRANSITIONS VIA ZK IS DONE: See [[https://issues.apache.org/jira/browse/HBASE-2692|HBASE-2692]]'''
  Currently state transitions are done inside master shuffling between Maps triggered by messages
carried on the back of regionserver heartbeats.  Move all to zookeeper.
  
  (Patrick Hunt and Mahadev have been helping with the below via [[http://wiki.apache.org/hadoop/ZooKeeper/HBaseUseCases|HBase
Zookeeper Use Cases]])

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