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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]])
