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最新的 CCAH CCA-505 免費考試真題:

1. You have a 20 node Hadoop cluster, with 18 slave nodes and 2 master nodes running HDFS High Availability (HA). You want to minimize the chance of data loss in you cluster. What should you do?

A) Run the ResourceManager on a different master from the NameNode in the order to load share HDFS metadata processing
B) Set an HDFS replication factor that provides data redundancy, protecting against failure
C) Configure the cluster's disk drives with an appropriate fault tolerant RAID level
D) Add another master node to increase the number of nodes running the JournalNode which increases the number of machines available to HA to create a quorum
E) Run a Secondary NameNode on a different master from the NameNode in order to load provide automatic recovery from a NameNode failure

2. You want to understand more about how users browse you public website. For example, you want to know which pages they visit prior to placing an order. You have a server farm of 200 web servers hosting your website. Which is the most efficient process to gather these web server logs into your Hadoop cluster for analysis?

A) Write a MApReduce job with the web servers from mappers and the Hadoop cluster nodes reducers
B) Ingest the server web logs into HDFS using Flume
C) Sample the web server logs web servers and copy them into HDFS using curl
D) Import all users clicks from your OLTP databases into Hadoop using Sqoop
E) Channel these clickstream into Hadoop using Hadoop Streaming

3. On a cluster running CDH 5.0 or above, you use the hadoop fs -put command to write a 300MB file into a previously empty directory using an HDFS block of 64MB. Just after this command has finished writing 200MB of this file, what would another use see when they look in the directory?

A) They will see the file with its original name. if they attempt to view the file, they will get a ConcurrentFileAccessException until the entire file write is completed on the cluster
B) The directory will appear to be empty until the entire file write is completed on the cluster
C) They will see the file with a ._COPYING_ extension on its name. if they view the file, they will see contents of the file up to the last completed block (as each 64MB block is written, that block becomes available)
D) They will see the file with a ._COPYING_extension on its name. If they attempt to view the file, they will get a ConcurrentFileAccessException until the entire file write is completed on the cluster.

4. What processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A) You must restart all six DatNode daemon to apply the changes to the cluste
B) You must restart the NameNode daemon to apply the changes to the cluster
C) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
D) You don't need to restart any daemon, as they will pick up changes automatically
E) You must modify the configuration file on each of the six DataNode machines.

問題與答案：