HADOOP-2198 HTable should have method to return table metadata

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@599534 13f79535-47bb-0310-9956-ffa450edef68

src/contrib/hbase/CHANGES.txt

@@ -41,27 +41,29 @@ Trunk (unreleased changes)
                (Bryan Duxbury via Stack)
 
   IMPROVEMENTS
-    HADOOP-2401 Add convenience put method that takes writable
-                (Johan Oskarsson via Stack)
-    HADOOP-2074 Simple switch to enable DEBUG level-logging in hbase
-    HADOOP-2088 Make hbase runnable in $HADOOP_HOME/build(/contrib/hbase)
-    HADOOP-2126 Use Bob Jenkins' hash for bloom filters
-    HADOOP-2157 Make Scanners implement Iterable
-    HADOOP-2176 Htable.deleteAll documentation is ambiguous
-    HADOOP-2139 (phase 1) Increase parallelism in region servers.
-    HADOOP-2267 [Hbase Shell] Change the prompt's title from 'hbase' to 'hql'.
-                (Edward Yoon via Stack)
-    HADOOP-2139 (phase 2) Make region server more event driven
-    HADOOP-2289 Useless efforts of looking for the non-existant table in select
-                command.
-                (Edward Yoon via Stack)
-    HADOOP-2257 Show a total of all requests and regions on the web ui
-                (Paul Saab via Stack)
-    HADOOP-2261 HTable.abort no longer throws exception if there is no active update.
-    HADOOP-2287 Make hbase unit tests take less time to complete.
-    HADOOP-2262 Retry n times instead of n**2 times.
-    HADOOP-1608 Relational Algrebra Operators
-                (Edward Yoon via Stack)
+   HADOOP-2401 Add convenience put method that takes writable
+               (Johan Oskarsson via Stack)
+   HADOOP-2074 Simple switch to enable DEBUG level-logging in hbase
+   HADOOP-2088 Make hbase runnable in $HADOOP_HOME/build(/contrib/hbase)
+   HADOOP-2126 Use Bob Jenkins' hash for bloom filters
+   HADOOP-2157 Make Scanners implement Iterable
+   HADOOP-2176 Htable.deleteAll documentation is ambiguous
+   HADOOP-2139 (phase 1) Increase parallelism in region servers.
+   HADOOP-2267 [Hbase Shell] Change the prompt's title from 'hbase' to 'hql'.
+               (Edward Yoon via Stack)
+   HADOOP-2139 (phase 2) Make region server more event driven
+   HADOOP-2289 Useless efforts of looking for the non-existant table in select
+               command.
+               (Edward Yoon via Stack)
+   HADOOP-2257 Show a total of all requests and regions on the web ui
+               (Paul Saab via Stack)
+   HADOOP-2261 HTable.abort no longer throws exception if there is no active update.
+   HADOOP-2287 Make hbase unit tests take less time to complete.
+   HADOOP-2262 Retry n times instead of n**2 times.
+   HADOOP-1608 Relational Algrebra Operators
+               (Edward Yoon via Stack)
+   HADOOP-2198 HTable should have method to return table metadata
+
 
 Release 0.15.1
 Branch 0.15

src/contrib/hbase/src/java/org/apache/hadoop/hbase/HTable.java

@@ -163,6 +163,22 @@ public class HTable implements HConstants {
     return this.tableName;
   }
 
+  /**
+   * @return table metadata 
+   * @throws IOException
+   */
+  public HTableDescriptor getMetadata() throws IOException {
+    HTableDescriptor [] metas = this.connection.listTables();
+    HTableDescriptor result = null;
+    for (int i = 0; i < metas.length; i++) {
+      if (metas[i].getName().equals(this.tableName)) {
+        result = metas[i];
+        break;
+      }
+    }
+    return result;
+  }
+
   /**
    * Gets the starting row key for every region in the currently open table
    * @return Array of region starting row keys

src/contrib/hbase/src/test/org/apache/hadoop/hbase/TestHTable.java

@@ -71,6 +71,11 @@ public class TestHTable extends HBaseClusterTestCase implements HConstants {
     // put some data into table A
     
     HTable a = new HTable(conf, tableAname);
+    
+    // Assert the metadata is good.
+    HTableDescriptor meta = a.getMetadata();
+    assertTrue(meta.equals(tableAdesc));
+    
     long lockid = a.startUpdate(row);
     a.put(lockid, COLUMN_FAMILY, value);
     a.commit(lockid);