HBASE-21689: Make table/namespace specific current quota info available in shell(describe_namespace & describe)

Signed-off-by: Guanghao Zhang <zghao@apache.org>

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

@@ -32,6 +32,7 @@ Alternatively, you can use the abbreviated 'desc' for the same thing.
 EOF
       end
 
+      # rubocop:disable Metrics/AbcSize, Metrics/MethodLength
       def command(table)
         column_families = admin.get_column_families(table)
 
@@ -40,9 +41,17 @@ EOF
         formatter.header(['COLUMN FAMILIES DESCRIPTION'])
         column_families.each do |column_family|
           formatter.row([column_family.to_s], true)
+          puts
         end
         formatter.footer
-      end
+        puts
+        formatter.header(%w[QUOTAS])
+        count = quotas_admin.list_quotas(TABLE => table.to_s) do |_, quota|
+          formatter.row([quota])
+        end
+        formatter.footer(count)
+      end
+      # rubocop:enable Metrics/AbcSize, Metrics/MethodLength
     end
   end
 end

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

@@ -27,12 +27,22 @@ Describe the named namespace. For example:
 EOF
       end
 
+      # rubocop:disable Metrics/AbcSize
       def command(namespace)
         desc = admin.describe_namespace(namespace)
 
         formatter.header(['DESCRIPTION'], [64])
         formatter.row([desc], true, [64])
-      end
+
+        puts
+        formatter.header(%w[QUOTAS])
+        ns = namespace.to_s
+        count = quotas_admin.list_quotas(NAMESPACE => ns) do |_, quota|
+          formatter.row([quota])
+        end
+        formatter.footer(count)
+      end
+      # rubocop:enable Metrics/AbcSize
     end
   end
 end

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

@@ -60,6 +60,7 @@ module Hbase
   end
 
   # Simple administration methods tests
+  # rubocop:disable Metrics/ClassLength
   class AdminMethodsTest < Test::Unit::TestCase
     include TestHelpers
 
@@ -267,8 +268,61 @@ module Hbase
       end
     end
 
-    define_test "describe should return a description" do
+    define_test 'describe should return a description and quotas' do
-      assert_not_nil admin.describe(@test_name)
+      drop_test_table(@create_test_name)
+      command(:create, @create_test_name, 'cf1', 'cf2')
+      command(:set_quota,
+              TYPE => SPACE,
+              LIMIT => '1G',
+              POLICY => NO_INSERTS,
+              TABLE => @create_test_name)
+      output = capture_stdout { command(:describe, @create_test_name) }
+
+      assert(output.include?("Table #{@create_test_name} is ENABLED"))
+      assert(output.include?('COLUMN FAMILIES DESCRIPTION'))
+      assert(output.include?("NAME => 'cf1'"))
+      assert(output.include?("NAME => 'cf2'"))
+      assert(output.include?('2 row(s)'))
+
+      assert(output.include?('QUOTAS'))
+      assert(output.include?('LIMIT => 1G'))
+      assert(output.include?('VIOLATION_POLICY => NO_INSERTS'))
+      assert(output.include?('TYPE => SPACE'))
+      assert(output.include?('1 row(s)'))
+
+      command(:set_quota,
+              TYPE => SPACE,
+              LIMIT => NONE,
+              TABLE => @create_test_name)
+      output = capture_stdout { command(:describe, @create_test_name) }
+      assert(output.include?('0 row(s)'))
+    end
+
+    define_test 'describe_namespace should return a description and quotas' do
+      ns = @create_test_name
+      command(:create_namespace, ns)
+      command(:set_quota,
+              TYPE => SPACE,
+              LIMIT => '1G',
+              POLICY => NO_INSERTS,
+              NAMESPACE => ns)
+      output = capture_stdout { command(:describe_namespace, ns) }
+
+      assert(output.include?('DESCRIPTION'))
+      assert(output.include?("NAME => '#{ns}'"))
+
+      assert(output.include?('QUOTAS'))
+      assert(output.include?('LIMIT => 1G'))
+      assert(output.include?('VIOLATION_POLICY => NO_INSERTS'))
+      assert(output.include?('TYPE => SPACE'))
+      assert(output.include?('1 row(s)'))
+
+      command(:set_quota,
+              TYPE => SPACE,
+              LIMIT => NONE,
+              NAMESPACE => ns)
+      output = capture_stdout { command(:describe_namespace, ns) }
+      assert(output.include?('0 row(s)'))
     end
 
     #-------------------------------------------------------------------------------
@@ -332,6 +386,7 @@ module Hbase
       end
     end
   end
+  # rubocop:enable Metrics/ClassLength
 
   # Simple administration methods tests
   class AdminCloneTableSchemaTest < Test::Unit::TestCase