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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/MasterRewrite" by stack
Date Tue, 20 Oct 2009 05:11:46 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=5&rev2=6

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

  
  == Problems with current Master ==
   * Balancer is not testable unless you spin up full cluster
-  * State transitions are not atomic; various messaging sequences can produce confused cluster
state.
+  * And here is a small selection of the issues a rewrite should address...
+   * HBASE-1422 Refactor to Server Manager
+   * HBASE-1750 Region opens and assignment running independent of shutdown processing
+   * HBASE-1439 race between master and regionserver after missed heartbeat
+   * HBASE-1736 If RS can't talk to master, pause; more importantly, don't split (Currently
we do and splits are lost and table is wounded)
+   * HBASE-869 On split, if failure updating of .META., table subsequently broke
+   * HBASE-934 Assigning all regions to one server only
+   * HBASE-1666 'safe mode' is broken; MetaScanner initial scan completes without scanning
.META.
+   * HBASE-1679 Flapping DNS does us more harm than it need to
+   * HBASE-1700 Regionserver should be parsimonious regards messages sent master
+   * HBASE-1676 load balancing on a large cluster doesn't work very well
+   * HBASE-1742 Region lost (disabled) when -ROOT- offline or hosting server dies just before
it tells master successful
+   * HBASE-1364 [performance] Distributed splitting of regionserver commit logs
+   * HBASE-451 Remove HTableDescriptor from HRegionInfo
+   * HBASE-1111 [performance] Crash recovery takes way too long
+   * HBASE-1730 online schema updates
+   * HBASE-1502 Remove need for heartbeats in HBase
+   * HBASE-1451 Redo master management of state transitions coalescing and keeping transition
state over in ZK
+ 	  
  
  == Design ==
  

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