CCA-505 무료 덤프문제 온라인 액세스

In CDH4 and later, which file contains a serialized form of all the directory and files inodes in the filesystem, giving the NameNode a persistent checkpoint of the filesystem metadata?

• A.VERSION
• B.Edits_N-M (Where N-M specifies transactions between transactions ID N and transaction ID N)
• C.Fsimage_N (Where N reflects all transactions up to transaction ID N)
• D.fstime

Which is the default scheduler in YARN?

• A.YARN doesn't configure a default scheduler. You must first assign a appropriate scheduler class in yarn-site.xml
• B.Capacity Scheduler
• C.FIFO Scheduler
• D.Fair Scheduler

During the execution of a MapReduce v2 (MRv2) job on YARN, where does the Mapper place the intermediate data each Map task?

• A.The Mapper stores the intermediate data in HDFS on the node where the MAP tasks ran in the HDFS /usercache/&[user]sppcache/application_&(appid) directory for the user who ran the job
• B.The Mapper transfers the intermediate data immediately to the Reducers as it generated by the Map task
• C.The Mapper stores the intermediate data on the underlying filesystem of the local disk in the directories yarn.nodemanager.local-dirs
• D.The Mapper stores the intermediate data on the mode running the job's ApplicationMaster so that is available to YARN's ShuffleService before the data is presented to the Reducer
• E.YARN holds the intermediate data in the NodeManager's memory (a container) until it is transferred to the Reducers

You want a node to only swap Hadoop daemon data from RAM to disk when absolutely necessary. What should you do?

• A.Set vm.swappiness to o in /etc/sysctl.conf
• B.Delete the /etc/swap file on the node
• C.Set the ram.swap parameter to o in core-site.xml
• D.Delete the /dev/vmswap file on the node
• E.Delete the /swapfile file on the node

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.Sample the web server logs web servers and copy them into HDFS using curl
• C.Ingest the server web logs into HDFS using Flume
• D.Import all users clicks from your OLTP databases into Hadoop using Sqoop
• E.Channel these clickstream into Hadoop using Hadoop Streaming