/**
* 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.
*/
package com.alibaba.wasp.meta;
import com.alibaba.wasp.FConstants;
import com.alibaba.wasp.MasterNotRunningException;
import com.alibaba.wasp.MetaException;
import com.alibaba.wasp.ZooKeeperConnectionException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import java.io.IOException;
/**
*
*
*/
public class FMetaUtil {
public static final Log LOG = LogFactory.getLog(FMetaUtil.class);
/**
* Use HBaseAdmin to check the meta table exists. if not exists create it. if
* exists just return.
*/
public static void checkAndInit(Configuration conf) throws MetaException {
try {
HBaseAdmin admin = new HBaseAdmin(conf);
String metaTable = conf.get(FConstants.METASTORE_TABLE,
FConstants.DEFAULT_METASTORE_TABLE);
if (!admin.tableExists(metaTable)) {
// if meta table don't exists just create it.
HTableDescriptor desc = new HTableDescriptor(metaTable);
HColumnDescriptor family = new HColumnDescriptor(
FConstants.CATALOG_FAMILY_STR);
family.setInMemory(true);
desc.addFamily(family);
admin.createTable(desc);
}
admin.close();
} catch (ZooKeeperConnectionException zce) {
throw new MetaException("FMeta could not connect to zookeeper ", zce);
} catch (MasterNotRunningException mnre) {
throw new MetaException("FMeta Could not connect to HBase Master ", mnre);
} catch (IOException e) {
throw new MetaException(e);
}
}
/**
* Use HBaseAdmin to delete the meta table .
*/
public static boolean clean(Configuration conf) {
try {
HBaseAdmin admin = new HBaseAdmin(conf);
String metaTable = conf.get(FConstants.METASTORE_TABLE,
FConstants.DEFAULT_METASTORE_TABLE);
if (admin.tableExists(metaTable)) {
admin.disableTable(metaTable);
admin.deleteTable(metaTable);
}
admin.close();
return true;
} catch (ZooKeeperConnectionException zce) {
LOG.error("Could not connect to zookeeper ", zce);
} catch (MasterNotRunningException mnre) {
LOG.error("Could not connect to HBase Master ", mnre);
} catch (IOException e) {
LOG.error(e);
}
return false;
}
}