Index: src/docbkx/book.xml =================================================================== --- src/docbkx/book.xml (revision 1175882) +++ src/docbkx/book.xml (working copy) @@ -1247,9 +1247,7 @@ -
- Daemons -
Master +
Master HMaster is the implementation of the Master Server. The Master server is responsible for monitoring all RegionServer instances in the cluster, and is the interface for all metadata changes. @@ -1275,13 +1273,15 @@
Processes The Master runs several background threads: - - LoadBalancer periodically reassign regions in the cluster. - - CatalogJanitor periodically checks and cleans up the .META. table. - - +
LoadBalancer + Periodically, and when there are not any regions in transition, + a load balancer will run and move regions around to balance cluster load. + See for configuring this property. +
+
CatalogJanitor + Periodically checks and cleans up the .META. table. See for more information on META. +
@@ -1302,24 +1302,25 @@
Processes The RegionServer runs a variety of background threads: - - CompactSplitThread checks for splits and handle minor compactions. - - MajorCompactionChecker checks for major compactions. - - MemStoreFlusher periodically flushes in-memory writes in the MemStore to StoreFiles. - - LogRoller periodically checks the RegionServer's HLog. - - +
CompactSplitThread + Checks for splits and handle minor compactions. +
+
MajorCompactionChecker + Checks for major compactions. +
+
MemStoreFlusher + Periodically flushes in-memory writes in the MemStore to StoreFiles. +
+
LogRoller + Periodically checks the RegionServer's HLog. +
-
Regions - This chapter is all about Regions. + This section is all about Regions. Regions are comprised of a Store per Column Family. @@ -1379,14 +1380,13 @@ splits (and for why you might do this)
-
- Region Load Balancer +
+ Region Load Balancing - Periodically, and when there are not any regions in transition, - a load balancer will run and move regions around to balance cluster load. - The period at which it runs can be configured. + Regions can be periodically moved by the . +
Index: src/docbkx/configuration.xml =================================================================== --- src/docbkx/configuration.xml (revision 1175882) +++ src/docbkx/configuration.xml (working copy) @@ -1095,7 +1095,16 @@
+
Other Configurations +
Balancer + The balancer is periodic operation run on the master to redistribute regions on the cluster. It is configured via + hbase.balancer.period and defaults to 300000 (5 minutes). + See for more information on the LoadBalancer. + +
+ +
Bloom Filter Configuration