HADOOP-2240 Truncate for hbase
git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk/src/contrib/hbase@609256 13f79535-47bb-0310-9956-ffa450edef68
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/**
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* Copyright 2007 The Apache Software Foundation
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*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hbase.shell;
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import java.io.IOException;
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import java.io.Writer;
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import org.apache.hadoop.hbase.HBaseAdmin;
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import org.apache.hadoop.hbase.HBaseConfiguration;
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import org.apache.hadoop.hbase.HColumnDescriptor;
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import org.apache.hadoop.hbase.HConnection;
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import org.apache.hadoop.hbase.HConnectionManager;
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import org.apache.hadoop.hbase.HTableDescriptor;
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import org.apache.hadoop.io.Text;
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/**
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* Truncate table is used to clean all data from a table.
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*/
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public class TruncateCommand extends BasicCommand {
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private Text tableName;
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public TruncateCommand(Writer o) {
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super(o);
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}
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public ReturnMsg execute(final HBaseConfiguration conf) {
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if (this.tableName == null)
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return new ReturnMsg(0, "Syntax error : Please check 'Truncate' syntax.");
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try {
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HConnection conn = HConnectionManager.getConnection(conf);
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HBaseAdmin admin = new HBaseAdmin(conf);
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if (!conn.tableExists(this.tableName)) {
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return new ReturnMsg(0, "Table not found.");
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}
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HTableDescriptor[] tables = conn.listTables();
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HColumnDescriptor[] columns = null;
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for (int i = 0; i < tables.length; i++) {
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if (tables[i].getName().equals(this.tableName)) {
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columns = tables[i].getFamilies().values().toArray(
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new HColumnDescriptor[] {});
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break;
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}
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}
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println("Truncating a '" + tableName + "' table ... Please wait.");
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admin.deleteTable(tableName); // delete the table
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HTableDescriptor tableDesc = new HTableDescriptor(tableName.toString());
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for (int i = 0; i < columns.length; i++) {
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tableDesc.addFamily(columns[i]);
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}
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admin.createTable(tableDesc); // re-create the table
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} catch (IOException e) {
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return new ReturnMsg(0, "error msg : " + e.toString());
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}
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return new ReturnMsg(0, "'" + tableName + "' is successfully truncated.");
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}
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public void setTableName(String tableName) {
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this.tableName = new Text(tableName);
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}
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@Override
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public CommandType getCommandType() {
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return CommandType.DDL;
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}
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}
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