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For NPDP certification exam, they have the same questions & answers, while the main difference between them is the format.
NEW QUESTION: 1
What occurs when you run a hadoop job specifying output directory for job output which already exists in HDFS?
A. the job will run successfully output from the reducers will be placed in a directory called job output -1
B. An error will occur immediately because the output directory must not already exist.
C. the job will run successfully. Output from the reducers will override the contents of existing directory
D. an error will occur after the mappers have completed but before any reducers begin to run because the output path must not exist during the shuffle and sort.
Answer: B
Explanation:
Class org.apache.hadoop.mapred include:
* Interface OutputFormat<K,V>
OutputFormat describes the output-specification for a Map-Reduce job.
The Map-Reduce framework relies on the OutputFormat of the job to:
/ Validate the output-specification of the job. For e.g. check that the output directory doesn't
already exist.
/ Provide the RecordWriter implementation to be used to write out the output files of the job.
Output files are stored in a FileSystem.
* checkOutputSpecs
void checkOutputSpecs(FileSystem ignored,
JobConf job)
throws IOException
Check for validity of the output-specification for the job.
This is to validate the output specification for the job when it is a job is submitted. Typically checks
that it does not already exist, throwing an exception when it already exists, so that output is not
overwritten.
Parameters:
ignored -
job - job configuration.
Throws:
IOException - when output should not be attempted
NEW QUESTION: 2
Which file formats support Column data compression? (Choose two)
A. Text
B. RCFile
C. Parquet
D. Sequence_text
E. Avro
Answer: C,E
NEW QUESTION: 3
Your company uses Git as a source code control system for a complex app named App1.
You plan to add a new functionality to App1.
You need to design a branching model for the new functionality.
Which branch lifetime and branch time should you use in the branching model? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
Explanation
Branch lifetime: Short-lived
Branch type: Feature
Feature branches are used when developing a new feature or enhancement which has the potential of a development lifespan longer than a single deployment. When starting development, the deployment in which this feature will be released may not be known. No matter when the feature branch will be finished, it will always be merged back into the master branch.
References:
https://gist.github.com/digitaljhelms/4287848
NEW QUESTION: 4
Topic 5, Scenario 5, V1"Human Resource System"
You have recently been employed as a test manager for a software house producing Human Resource (HR) systems, namely Payroll, Personnel and Recruitment systems. The company is relatively new and wants to make a major impact in the market by producing a worldwide enterprise HR product.
In addition to risk, identify TWO other components of a testing strategy.
A. The test schedule
B. Test training needs for the project resources
C. The test design techniques to be used
D. Test performance indicators
E. The entry and exit criteria for each test phase
Answer: C,E