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Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2009/10/19 20:44:27 UTC
[Hadoop Wiki] Trivial Update of "Hbase/MasterRewrite" by stack
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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
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== 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