### 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.