com.alibaba.wasp.meta.FMetaUtil.java Source code

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Here is the source code for com.alibaba.wasp.meta.FMetaUtil.java

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/**
 * 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;
    }
}