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Mapr (HP) Hadoop Developer Certification Questions and Answers (Dumps and Practice Questions)



Question : Which is the correct command to copy files from local to HDFS file systems
: Which is the correct command to copy files from local to HDFS file systems
1. hadoop fs -copy pappu.txt pappu.txt
2. hadoop fs -copyFromPath pappu.txt pappu.txt
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4. None of the above

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Question : Which is the correct command to list all the files from current directory
: Which is the correct command to list all the files from current directory
1. hadoop fs -ls
2. hadoop fs -list
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4. All of the above



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Question : Which is the correct command ?

: Which is the correct command ?
1. hadoop fs -ls
2. hadoop fs -copyToLocal /user/pappu/pappu.txt pappu.txt
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4. 1,2 and 3 are correct
5. Only 1 and 2 are correct




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Related Questions

Question : Select correct statements from below


: Select correct statements from below
1. reduce phase does not start until all map tasks complete

2. In general, it is re-commended, we should not enable speculative execution

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4. 1,2

5. 1,2,3



Question : In which of the Scenario, we should enable JVM re-use ?


 : In which of the Scenario, we should enable JVM re-use ?
1. When there is long running TaskTracker and JobTracker

2. If we have small number of Map tasks and reduce tasks

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4. 1,2

5. None of 1,2,3



Question : Select correct statement regarding JVM re-use?


 : Select correct statement regarding JVM re-use?
1. There is a parameter named mapred.job.reuse.jvm.num.tasks to configure JVM re-use

2. if we set mapred.job.reuse.jvm.num.tasks to -1 , unlimited number of tasks can be executed on this JVM

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4. 1,2

5. 1,2,3



Question : In General, which of the following will help us to improve the MapReduce job performance, with regards to Circular Buffer?


 : In General, which of the following will help us to improve the MapReduce job performance, with regards to Circular Buffer?
1. Increasing the size of Circular Buffer

2. Reducing number of Spills of Circular Buffer

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4. 1,2
5. 1,2,3



Question : Select correct statement regarding Circular buffer and spilling of these buffers


: Select correct statement regarding Circular buffer and spilling of these buffers
1. When circular buffer reaches 80% (or any configured size). It will first sent data to sort by key, if combiner is configured, it will also executed.

2. By default 10 Spills can again merge, after spills

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4. 1,2

5. 1,2,3


Question : Please map the followings

A. mapred.map.child.java.opts
B. mapred.reduce.child.java.opts
C. mapred.child.java.opts
D. mapred.child.ulimit

1. Maximum size of virtual memory consumed by a task and its children.
2. Applies to Map Tasks
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4. Applies to both Map and Reduce tasks

: Please map the followings
1. A-1, B-2 , C-3, D-4
2. A-2, B-3 , C-1, D-4
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4. A-2, B-3 , C-4, D-1
5. A-3, B-2 , C-1, D-4