Cloudera Impala.

虽然现在，Hadoop社区一直在尝试为Hadoop平台带来低延迟，交互式SQL能力（更好地称为SQL-On-Hadoop）。This has led to a few open source systems such as Cloudera Impala, Apache Drill, Facebook’s Presto etc being developed actively through 2014. We think the SQL-on-Hadoop trend signals an important shift as it changes Hadoop's proposition from being a batch oriented technology that was complementary to databases into something that could compete with them.Cloudera Impala.是第一个SQL-On-Hadoop平台之一。它是一种分布式，庞大平行，基于C ++的查询引擎。该平台的核心组件是Impala守护程序，其协调跨Impala集群的一个或多个节点的SQL查询执行。Impala旨在以所有流行的文件格式从存储在HDF上的文件中读取数据。它利用Hive的元数据目录，以便在两个数据库平台之间共享数据库和表。Impala附带Shell以及JDBC和ODBC驱动程序，供应用程序使用。