CCAH-CCA-500-2题:what is the maximum number of NameNode daemons.....

2.Assuming you’re not running HDFS Federation, what is the maximum number of NameNode daemons

you should run on your cluster in order to avoid a “split-brain” scenario with your NameNode

when running HDFS High Availability (HA) using Quorum-based storage?

A. Two active NameNodes and two Standby NameNodes

B. One active NameNode and one Standby NameNode

C. Two active NameNodes and on Standby NameNode

D. Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of 

NameNodes you can deploy

问题:

 当集群没有配置HDFS Federation时,而配置HDFS HA时,集群的会有几个NameNode进程？

解析:

  搭建过Apache Hadoop分布式集群(HDFS HA),就知道只有两个NameNode进程,一个是active,另外一个是standby。

官方解释如图: