CCA-500 Cluster Practice Questions

You have a Hadoop cluster HDFS, and a gateway machine external to the cluster from which clients submit jobs. What do you need to do in order to run Impala on the cluster and submit jobs from the command line of the gateway machine?

• AA. Install the impalad daemon statestored daemon, and daemon on each machine in the cluster, and the impala shell on your gateway machine
• BB. Install the impalad daemon, the statestored daemon, the catalogd daemon, and the impala shell on your gateway machine
• CC. Install the impalad daemon and the impala shell on your gateway machine, and the statestored daemon and catalogd daemon on one of the nodes in the cluster
• DD. Install the impalad daemon on each machine in the cluster, the statestored daemon and catalogd daemon on one machine in the cluster, and the impala shell on your gateway machine
• EE. Install the impalad daemon, statestored daemon, and catalogd daemon on each machine in the cluster and on the gateway node

You are planning a Hadoop cluster and considering implementing 10 Gigabit Ethernet as the network fabric. Which workloads benefit the most from faster network fabric?

• AA. When your workload generates a large amount of output data, significantly larger than the amount of intermediate data
• BB. When your workload consumes a large amount of input data, relative to the entire capacity if HDFS
• CC. When your workload consists of processor-intensive tasks
• DD. When your workload generates a large amount of intermediate data, on the order of the input data itself

Your Hadoop cluster contains nodes in three racks. You have not configured the dfs.hosts property in the NameNode’s configuration file. What results?

• AA. The NameNode will update the dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with the command dfsadmin–refreshNodes
• BB. No new nodes can be added to the cluster until you specify them in the dfs.hosts file
• CC. Any machine running the DataNode daemon can immediately join the cluster
• DD. Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster

Assuming a cluster running HDFS, MapReduce version 2 (MRv2) on YARN with all settings at their default, what do you need to do when adding a new slave node to cluster?

• AA. Nothing, other than ensuring that the DNS (or/etc/hosts files on all machines) contains any entry for the new node.
• BB. Restart the NameNode and ResourceManager daemons and resubmit any running jobs.
• CC. Add a new entry to /etc/nodes on the NameNode host.
• DD. Restart the NameNode of dfs.number.of.nodes in hdfs-site.xml