Impala架构分析 Impala是Cloudera公司主导开发的新型查询系统,它提供SQL语义,能查询存储在Hadoop的HDFS和HBase中的PB级大数据.已有的Hive系统虽然也提供了SQL语义,但由于Hive底层执行使用的是MapReduce引擎,仍然是一个批处理过程,难以满足查询的交互性.相比之下,Impala的最大特点也是最大卖点就是它的快速.那么Impala如何实现大数据的快速查询呢?在回答这个问题前,需要先介绍Google的Dremel系统,因为Impala最开始是参照 Dre
一 架构 Impala is a massively-parallel query execution engine, which runs on hundreds of machines in existing Hadoop clusters. It is decoupled from the underlying storage engine, unlike traditional relational database management systems where the query
1.配置/etc/yum.repos.d clouder-kudu.repo [cloudera-kudu]# Packages for Cloudera's Distribution for kudu, Version 5, on RedHat or CentOS 6 x86_64name=Cloudera's Distribution for kudu, Version 5baseurl=http://archive.cloudera.com/kudu/redhat/6/x86_64/kud