HBASE-29950 Add a shell command for reopen table regions

hbase-shell/src/main/ruby/hbase/admin.rb

@@ -615,6 +615,34 @@ def move(encoded_region_name, server = nil)
       @admin.move(encoded_region_name.to_java_bytes, server ? server.to_java_bytes : nil)
     end
 
+    #----------------------------------------------------------------------------------------------
+    # Reopen regions of a table
+    def reopen_regions(table_name, regions = nil)
+      table_name_obj = TableName.valueOf(table_name)
+      if regions.nil? || regions.empty?
+        @admin.reopenTableRegions(table_name_obj)
+      else
+        # Get all regions of the table
+        all_regions = @admin.getRegions(table_name_obj)
+        target_regions = java.util.ArrayList.new
+
+        regions.each do |r|
+          # r could be encoded name or full name
+          found = false
+          all_regions.each do |region_info|
+            if region_info.getEncodedName == r || region_info.getRegionNameAsString == r
+              target_regions.add(region_info)
+              found = true
+              break
+            end
+          end
+          raise ArgumentError, "Region #{r} not found in table #{table_name}" unless found
+        end
+
+        @admin.reopenTableRegions(table_name_obj, target_regions)
+      end
+    end
+
     #----------------------------------------------------------------------------------------------
     # Merge multiple regions
     def merge_region(regions, force)

hbase-shell/src/main/ruby/shell.rb

@@ -451,6 +451,7 @@ def self.exception_handler(hide_traceback)
     normalizer_enabled
     is_in_maintenance_mode
     clear_slowlog_responses
+    reopen_regions
     close_region
     compact
     compaction_switch

hbase-shell/src/main/ruby/shell/commands/reopen_regions.rb

@@ -0,0 +1,37 @@
+#
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+module Shell
+  module Commands
+    class ReopenRegions < Command
+      def help
+        <<-EOF
+Reopen all regions of a table or specific regions of a table.
+Examples:
+  hbase> reopen_regions 'TABLE_NAME'
+  hbase> reopen_regions 'TABLE_NAME', ['REGION_NAME1', 'REGION_NAME2']
+EOF
+      end
+
+      def command(table_name, regions = nil)
+        admin.reopen_regions(table_name, regions)
+      end
+    end
+  end
+end

hbase-shell/src/test/ruby/hbase/reopen_regions_test_cluster.rb

@@ -0,0 +1,66 @@
+#
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'hbase_shell'
+require 'stringio'
+require 'hbase_constants'
+require 'hbase/hbase'
+require 'hbase/table'
+
+module Hbase
+  class ReopenRegionsTest < Test::Unit::TestCase
+    include TestHelpers
+
+    def setup
+      setup_hbase
+      # Create test table if it does not exist
+      @test_name = "hbase_reopen_regions_test_table"
+      create_test_table(@test_name)
+    end
+
+    def teardown
+      shutdown
+    end
+
+    define_test "reopen_regions should work for all regions" do
+      assert_nothing_raised do
+        command(:reopen_regions, @test_name)
+      end
+    end
+
+    define_test "reopen_regions should work for specific regions" do
+      # Get Java Admin to fetch regions
+      java_admin = admin.instance_variable_get(:@admin)
+      regions = java_admin.getRegions(org.apache.hadoop.hbase.TableName.valueOf(@test_name))
+
+      assert(regions.size > 0, "Test table should have regions")
+      region_encoded_name = regions.get(0).getEncodedName
+
+      assert_nothing_raised do
+        command(:reopen_regions, @test_name, [region_encoded_name])
+      end
+    end
+
+    define_test "reopen_regions should raise error for non-existent region" do
+      assert_raise(ArgumentError) do
+        command(:reopen_regions, @test_name, ['non-existent-region'])
+      end
+    end
+  end
+end