Apache-Hadoop-Developer 무료 덤프문제 온라인 액세스

In a MapReduce job, you want each of your input files processed by a single map task. How do you configure a MapReduce job so that a single map task processes each input file regardless of how many blocks the input file occupies?

• A.Increase the parameter that controls minimum split size in the job configuration.
• B.Write a custom FileInputFormat and override the method isSplitable to always return false.
• C.Set the number of mappers equal to the number of input files you want to process.
• D.Write a custom MapRunner that iterates over all key-value pairs in the entire file.

Analyze each scenario below and indentify which best describes the behavior of the default partitioner?

• A.The default partitioner computes the hash of the value and takes the mod of that value with the number of reducers. The result determines the reducer assigned to process the key-value pair.
• B.The default partitioner computes the hash of the key. Hash values between specific ranges are associated with different buckets, and each bucket is assigned to a specific reducer.
• C.The default partitioner implements a round-robin strategy, shuffling the key-value pairs to each reducer in turn. This ensures an event partition of the key space.
• D.The default partitioner computes the hash of the key and divides that valule modulo the number of reducers. The result determines the reducer assigned to process the key-value pair.
• E.The default partitioner assigns key-values pairs to reduces based on an internal random number generator.

You need to move a file titled "weblogs" into HDFS. When you try to copy the file, you can't. You know you have ample space on your DataNodes. Which action should you take to relieve this situation and store more files in HDFS?

• A.Decrease the block size on all current files in HDFS.
• B.Decrease the block size on your remaining files.
• C.Increase the block size on all current files in HDFS.
• D.Increase the block size on your remaining files.
• E.Increase the amount of memory for the NameNode.
• F.Increase the number of disks (or size) for the NameNode.

Which one of the following statements regarding the components of YARN is FALSE?

• A.The ResourceManager monitors and restarts any failed Containers
• B.A Container executes a specific task as assigned by the ApplicationMaster
• C.The ResourceManager is responsible for scheduling and allocating resources
• D.A client application submits a YARW job to the ResourceManager

Which one of the following statements describes the relationship between the ResourceManager and the ApplicationMaster?

• A.The ApplicationMaster starts an instance of the ResourceManager within each Container
• B.The ResourceManager monitors and restarts any failed Containers of the ApplicationMaster
• C.The ApplicationMaster starts a single instance of the ResourceManager
• D.The ApplicationMaster requests resources from the ResourceManager