Changes between Initial Version and Version 1 of waue/2011/0426_4

Timestamp:

Apr 25, 2011, 3:54:10 PM (15 years ago)

Author:

waue

Comment:

--

waue/2011/0426_4

@@ +1 @@
+{{{
+#!html
+<div style="text-align: center; color:#151B8D"><big style="font-weight: bold;"><big><big>
+ITRI HBase 進階課程 
+</big></big></big></div> <div style="text-align: center; color:#7E2217"><big style="font-weight: bold;"><big>
+HBase 範例
+</big></big></div>
+}}}
+
+[wiki:waue/2011/0426 回課程大綱 << ] 第一關 [wiki:waue/2011/0426_4_2 > 下一關 ] 
+
+= 注意 = 
+
+ * 請將以下給個 hbase 重要的檔複製到 hadoop lib 目錄下，並且重新啟動 hbase 與 hadoop
+
+{{{
+$ cd /opt/hbase
+$ cp hbase-*.jar lib/zookeeper-3.2.2.jar contrib/transactional/hbase-0.20.6-transactional.jar /opt/hadoop/lib/
+$ /opt/hbase/bin/stop-hbase.sh
+$ /opt/hadoop/bin/stop-all.sh
+$ /opt/hadoop/bin/start-all.sh
+$ /opt/hbase/bin/start-hbase.sh
+}}}
+
+ * 若編譯以下範例的環境為console 端，請設定完整的classpath，詳細方法請看教材投影片
+ * 若開發是透過 eclipse ，請將 hbase-core.jar , zookeeper*.jar , hbase-*-transactional.jar 匯入到 project library 中，詳細方法請看教材投影片
+
+ * 注意: 若此程式執行於 eclipse ，則方便起見，請將程式的 eclipse only 的後兩行的註解取消，如：
+
+{{{
+#!java
+    // eclipse only
+          String[] args = {"ex1Table","Detail"};
+          argv = args;
+}}}
+
+= 範例一：新增Table =
+
+{{{
+bin/hadoop jar ItriMenu.jar CreateTable ex1Table Detail
+}}}
+
+= !CreateTable.java =
+{{{
+#!java
+package itri;
+
+import java.io.IOException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.client.HBaseAdmin;
+import org.apache.hadoop.util.GenericOptionsParser;
+
+public class CreateTable {
+        public static void createHBaseTable(String tablename, String family)
+                        throws IOException {
+                // HTableDescriptor contains the name of an HTable, and its column
+                // families
+                // HTableDescriptor 用來描述table的屬性
+                HTableDescriptor htd = new HTableDescriptor(tablename);
+                // HColumnDescriptor HColumnDescriptor contains information about a
+                // column family such as the number of versions, compression settings,
+                // etc.
+                // HTableDescriptor 透過 add() 方法來加入Column family
+
+                htd.addFamily(new HColumnDescriptor(family));
+
+                // HBaseConfiguration 能接收 hbase-site.xml 的設定值
+                HBaseConfiguration config = new HBaseConfiguration();
+                // 檔案的操作則使用 HBaseAdmin
+                HBaseAdmin admin = new HBaseAdmin(config);
+                // 檢查
+                if (admin.tableExists(tablename)) {
+                        System.out.println("Table: " + tablename + "Existed.");
+                } else {
+                        System.out.println("create new table: " + tablename);
+                        // 建立
+                        admin.createTable(htd);
+                }
+        }
+
+        static public void main(String argv[]) throws IOException {
+//              String[] argc = {"t1","f1"};argv = argc;
+                String[] otherArgs = new GenericOptionsParser(new Configuration(), argv)
+                                .getRemainingArgs();
+                if (otherArgs.length < 2) {
+                        System.out.println("CreateTable <newTableName> <Family>");
+                        return;
+                }
+                
+                String tablename = otherArgs[0];
+                String family = otherArgs[1];
+
+                System.out.println("1. create table :" + tablename);
+
+                createHBaseTable(tablename, family);
+        }
+}
+
+}}}
+
+ * 執行結果
+
+{{{
+1. create table :ex1Table
+ex1Table created.
+}}}