### Eclipse Workspace Patch 1.0
#P apache-trunk
Index: src/docbkx/book.xml
===================================================================
--- src/docbkx/book.xml (revision 1460103)
+++ src/docbkx/book.xml (working copy)
@@ -2175,7 +2175,21 @@
+
+
+ Region Merges
+ Master and Regionserver both participate in the event of region merges.
+ Client sends merge RPC to master, then master moves the regions together to the
+ same regionserver where the more heavily loaded region resided, finally master
+ send merge request to the regionserver and regionserver run the region merges.
+ Similar with process of region splits, region merges run as a local transaction
+ on the regionserver, offlines the regions and then merges two regions on the file
+ system, atomically delete merging regions from META and add merged region to the META,
+ opens merged region on the regionserver and reports the merge to Master at last.
+
+
+
Store
A Store hosts a MemStore and 0 or more StoreFiles (HFiles). A Store corresponds to a column family for a table for a given region.