CCD-333 Exam Questions

What is the difference between a failed task attempt and a killed task attempt?

What is a SequenceFile?

Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated file in HDFS.

To process input key-value pairs, your mapper needs to load a 512 MB data file in memory. What is the best way to accomplish this?

What types of algorithms are difficult to express MapReduce?

Your Custer's HOFS block size is 64MB. You have a directory containing 100 plain text files, each of which Is 100MB in size. The InputFormat for your job is TextInputFormat. How ma...

Does the MapReduce programming model provide a way for reducers to communicate with each other?

Which of the following best describes the map method input and output?

You have written a Mapper which invokes the following five calls to the outputcollector.collect method: How many times will the Reducer's reduce method be invoked.

In a MapReduce job with 500 map tasks, how many map task attempts will there be?

The Hadoop framework provides a mechanism for coping with machine issues such as faulty configuration or impending hardware failure. MapReduce detects that one or a number of machi...

Which MapReduce daemon runs on each slave node and participates in job execution?

Cloudera CCD-333 Exam What is the standard configuration of slave nodes in a Hadoop cluster?

Which happens if the NameNode crashes?

You are running a job that will process a single InputSplit on a cluster which has no other jobs currently running. Each node has an equal number of open Map slots. On which node w...

If you run the word count MapReduce program with m mappers and r reducers, how many output files will you get at the end of the job? And how many key-value pairs will there be in e...

You have a large dataset of key-value pairs, where the keys are strings, and the values are integers. For each unique key, you want to identify the largest integer. In writing a Ma...

What happens in a MapReduce job when you set the number of reducers to zero?

You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, Intwritable values. Which interface should your class implement?

Combiners Increase the efficiency of a MapReduce program because:

In a large MapReduce job with m mappers and r reducers, how many distinct copy operations will there be in the sort/shuffle phase?

When is the reduce method first called in a MapReduce job?

What happens in a MapReduce job when you set the number of reducers to one?

In the standard word count MapReduce algorithm, why might using a combiner reduce the overall Job running time?

Which two of the following are valid statements? (Choose two)

Which of the following describes how a client reads a file from HDFS?

You need to create a job that does frequency analysis on input data. You will do this by writing a Mapper that uses TextInputForma and splits each value (a line of text from an inp...

Which of the following statements best describes how a large (100 GB) file is stored in HDFS?

Your cluster has 10 DataNodes, each with a single 1 TB hard drive. You utilize all your disk capacity for HDFS, reserving none for MapReduce. You implement default replication sett...

You use the hadoop fs 璸ut command to write a 300 MB file using an HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another use...

What is a SequenceFile?

Given a directory of files with the following structure: line number, tab character, string: 1. abialkjfjkaoasdfjksdlkjhqweroij 2. kadf jhuwqounahagtnbvaswslmnbfgy 3. kjfteiomndscx...

In a MapReduce job, you want each of you 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 regard...

Which of the following best describes the workings of TextInputFormat?

Which of the following statements most accurately describes the relationship between MapReduce and Pig?

You have an employee who is a Date Analyst and is very comfortable with SQL. He would like to run ad-hoc analysis on data in your HDFS duster. Which of the following is a data ware...

Workflows expressed in Oozie can contain:

You need a distributed, scalable, data Store that allows you random, realtime read/write access to hundreds of terabytes of data. Which of the following would you use?

Which of the following utilities allows you to create and run MapReduce jobs with any executable or script as the mapper and/or the reducer?

What is the preferred way to pass a small number of configuration parameters to a mapper or reducer? Cloudera CCD-333 Exam

How does the NameNode detect that a DataNode has failed?

The NameNode uses RAM for the following purpose:

In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:

What is a Writable?

In a MapReduce job, the reducer receives all values associated with the same key. Which statement is most accurate about the ordering of these values?

All keys used for intermediate output from mappers must do which of the following:

You have the following key value pairs as output from your Map task: (the, 1) (fox, 1) (runs, 1) (faster, 1) (than, 1) (the, 1) (dog, 1) How many keys will be passed to the reducer...

You write a MapReduce job to process 100 files in HDFS. Your MapReducc algorithm uses TextInputFormat and the IdentityReducer: the mapper applies a regular expression over input va...

For each intermediate key, each reducer task can emit:

For each input key-value pair, mappers can emit: