Cloudera Hadoop Developer Certification Questions and Answer (Dumps and Practice Questions)

Question :

What happens if mapper output does not match reducer input?


1. Hadoop API will convert the data to the type that is needed by the reducer.
2. Data input/output inconsistency cannot occur. A preliminary validation check is executed prior
to the full execution of the job to ensure there is consistency.
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4. A real-time exception will be thrown and map-reduce job will fail



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Explanation: Reducers are based on the mappers output and Java is a strongly typed language. Therefore, an exception will be thrown at run-time if types do not much.




Question :

Can you provide multiple input paths to a map-reduce jobs?

1. Yes, but only in Hadoop 0.22+
2. No, Hadoop always operates on one input directory
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4. Yes, but the limit is currently capped at 10 input paths.



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Explanation: The Hadoop framework is capable of taking different input paths and assigning different mappers for each one. This is a very convenient way of writing different mappers to handle various datasets




Question :

Can you assign different mappers to different input paths?


1. Yes, but only if data is identical.
2. Yes, different mappers can be assigned to different directories
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4. Yes but only in Hadoop .22+




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Explanation: Assigning different mappers to different data sources is the way to quickly and efficiently create code for processing multiple formats.

Related Questions

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Question : Which project provides prgramatic access like JDBC or ODBC of the data stored in HDFS

1. Hive
2. Pig
3. OOzie
4. Flume


Question : Hive stores in table format like RDBMS

1. True
2. False



Question : In case of hive, table definition is stored in a metastore

1. true
2. false




Question : In case of Pig, schema definition is defined at runtime

1. True
2. False



Question :
Which statement is true about HBase


1. It is a column family database
2. Can store massive amount of data like Terabytes
3. It gives high throughput
4. All of the above



Question : Which of the statement is wrong about HBase

1. Tables can have thousands of columns
2. It is not mendatory to have data in all the columns
3. It does not support transaction
4. All of the above
5. None of the above