Hadoop Practice Test 2

1. Point out the correct statement.

Moving Computation is expensive than Moving Data

When the processing is done on the data algorithm is moved across the Action Nodes rather than data to the algorithm

Data locality means movement of the algorithm to the data instead of data to algorithm

None of the mentioned

2. The ____________ is an iterator which reads through the file and returns objects using the next() method.

DatumReader

None of the mentioned

DatReader

DatumRead

3. Point out the wrong statement.

None of the mentioned

MapReduce has a complex model of data processing: inputs and outputs for the map and reduce functions are key-value pairs

The map function in Hadoop MapReduce have the following general form:map:(K1, V1) -> list(K2, V2)

The reduce function in Hadoop MapReduce have the following general form: reduce: (K2, list(V2)) -> list(K3, V3)

4. Avro supports ______ kinds of complex types.

5. The _________ codec from Google provides modest compression ratios.

Snapcheck

Snappy

None of the mentioned

FileCompress

6. Which of the following supports splittable compression?

All of the mentioned

LZO

Gzip

Bzip2

7. Point out the wrong statement.

Unions may immediately contain other unions

Record, enums and fixed are named types

A namespace is a dot-separated sequence of such names

All of the mentioned

8. The ____________ and the EditLog are central data structures of HDFS.

FsImages

FsImage

DsImage

All of the mentioned

9. Avro is said to be the future _______ layer of Hadoop.

All of the mentioned

RPC

RDC

RMC

10. Which of the following is a primitive data type in Avro?

all of the mentioned

boolean

float

null