HBASE-3437 : Support Explict Split Points from the Shell

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1057799 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java

@@ -1059,6 +1059,11 @@ public class HBaseAdmin implements Abortable {
     split(tableNameOrRegionName, null);
   }
 
+  public void split(final String tableNameOrRegionName,
+    final String splitPoint) throws IOException, InterruptedException {
+    split(Bytes.toBytes(tableNameOrRegionName), Bytes.toBytes(splitPoint));
+  }
+
   /**
    * Split a table or an individual region.
    * Asynchronous operation.

src/main/java/org/apache/hadoop/hbase/regionserver/Store.java

@@ -1319,12 +1319,11 @@ public class Store implements HeapSize {
   StoreSize checkSplit(final boolean force) {
     this.lock.readLock().lock();
     try {
-      // Iterate through all store files
+      // sanity checks
-      if (this.storefiles.isEmpty()) {
+      if (!force) {
+        if (storeSize < this.desiredMaxFileSize || this.storefiles.isEmpty()) {
           return null;
         }
-      if (!force && (storeSize < this.desiredMaxFileSize)) {
-        return null;
       }
 
       if (this.region.getRegionInfo().isMetaRegion()) {

src/main/ruby/hbase/admin.rb

@@ -61,8 +61,12 @@ module Hbase
 
     #----------------------------------------------------------------------------------------------
     # Requests a table or region split
-    def split(table_or_region_name)
+    def split(table_or_region_name, split_point)
+      if split_point == nil
         @admin.split(table_or_region_name)
+      else
+        @admin.split(table_or_region_name, split_point)
+      end
     end
 
     #----------------------------------------------------------------------------------------------

src/main/ruby/shell/commands/split.rb

@@ -23,13 +23,19 @@ module Shell
     class Split < Command
       def help
         return <<-EOF
-Split table or pass a region row to split individual region
+Split entire table or pass a region to split individual region.  With the 
+second parameter, you can specify an explicit split key for the region.  
+Examples:
+    split 'tableName'
+    split 'regionName' # format: 'tableName,startKey,id'
+    split 'tableName', 'splitKey'
+    split 'regionName', 'splitKey'
 EOF
       end
 
-      def command(table_or_region_name)
+      def command(table_or_region_name, split_point = nil)
         format_simple_command do
-          admin.split(table_or_region_name)
+          admin.split(table_or_region_name, split_point)
         end
       end
     end