百亿级存储架构： ElasticSearch+HBase 海量存储架构与实现

以下是一个简化的代码示例，展示如何在ElasticSearch和HBase中创建索引和表，并展示如何将数据从HBase导入到ElasticSearch。

import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.elasticsearch.client.RestHighLevelClient;
 
// 配置HBase和ElasticSearch客户端
public class HBaseToElasticSearch {
 
    // 创建HBase表
    public static void createHBaseTable(String tableName, String... columnFamilies) throws IOException {
        // 初始化HBase配置
        Configuration config = HBaseConfiguration.create();
        // 建立连接
        try (Connection connection = ConnectionFactory.createConnection(config); Admin admin = connection.getAdmin()) {
            // 定义HBase表描述器
            TableDescriptorBuilder tableDescriptor = TableDescriptorBuilder.newBuilder(TableName.valueOf(tableName));
            for (String columnFamily : columnFamilies) {
                // 添加列族到表描述器
                tableDescriptor.setColumnFamily(ColumnFamilyDescriptorBuilder.of(columnFamily));
            }
            // 创建表
            admin.createTable(tableDescriptor.build());
        }
    }
 
    // 创建ElasticSearch索引
    public static void createElasticSearchIndex(RestHighLevelClient client, String indexName, String mappings) throws IOException {
        // 创建索引请求
        CreateIndexRequest request = new CreateIndexRequest(indexName);
        // 设置索引映射
        request.mapping(mappings, XContentType.JSON);
        // 执行创建索引操作
        client.indices().create(request, RequestOptions.DEFAULT);
    }
 
    // 将数据从HBase导入到ElasticSearch
    public static void importDataToElasticSearch(RestHighLevelClient client, String indexName, String hbaseTableName) throws IOException {
        // 初始化HBase配置
        Configuration config = HBaseConfiguration.create();
        // 建立连接
        try (Connection connection = ConnectionFactory.createConnection(config); 
             Admin admin = connection.getAdmin()) {
            // 扫描HBase表数据
            Table table = connection.getTable(TableName.valueOf(hbaseTableName));
            // 遍历数据并导入到ElasticSearch
            // ...
        }
    }
 
    public static void main(String[] args) {
        // 假设已经初始化了ElasticSearch和HBase客户端