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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/MasterRewrite" by stack
Date Mon, 19 Oct 2009 18:44:27 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=3&rev2=4

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

  
  == Notes ==
  To be organized...
+ 
+ === Schema vs State ===
+ Chatting w/ Berk, Ryan, and J-D:
+ 
+ Two locations in zk; one for schema and then one for state.  For example, could have hierarchy
in zk as follows:
+ 
+ {{{/hbase/tables/name/schema/{family1, family2}
+ /hbase/tables/name/state/{attributes [read-only, enabled, nocompact, noflush]}
+ /hbase/regionservers/openregions/{list of regions...}
+ /hbase/regionserver/to_open/{list of regions....}
+ /hbase/regionservers/to_close/{list of regions...}
+ 
+ Open of a region does not change state -- do not compact or rewrite anything -- in case
when we go back to zk to report open, its been opened elsewhere.
+ 
+ Need to come up with state transitions.  Eliminate fuzzy state.
+ 
+ == More Notes ==
  
  For RS Worst case loading calculation
   * 200 regionservers

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