Hadoop Practice Test 4

1. Point out the wrong statement.

The meaning of getNext() has changed and is called by Pig runtime to get the last tuple in the data

LoadCaster has methods to convert byte arrays to specific types.

The load/store UDFs control how data goes into Pig and comes out of Pig.

None of the mentioned

2. The CLI when invoked without the -i option will attempt to load $HIVE_HOME/bin/.hiverc and $HOME/.hiverc as _______ files.

termination

none of the mentioned

processing

initialization

3. Which of the following has methods to deal with metadata?

LoadPushDown

All of the mentioned

LoadMetadata

LoadCaster

4. Which of the tab shows all the role instances that have been instantiated for this service?

Service

Instance

All of the mentioned

Status

5. Point out the wrong statement.

None of the mentioned

An administrator can simply press Ctrl-C to stop the rebalancing process

classNAME displays the class name needed to get the Hadoop jar

Balancer Runs a cluster balancing utility

6. When $HIVE_HOME/bin/hive is run without either the -e or -f option, it enters _______ mode.

Batch

Multiple

None of the mentioned

Interactive shell

7. __________ is a variant of SequenceFileInputFormat that converts the sequence file’s keys and values to Text objects.

SequenceFile

All of the mentioned

SequenceFileAsTextInputFormat

SequenceAsTextInputFormat

8. Which of the following find the running time of each script (in seconds)?

a = load '/mapred/history/done' using HadoopJobHistoryLoader() as (j:map[], m:map[], r:map[]);
b = foreach a generate j#'PIG_SCRIPT_ID' as id, j#'USER' as user, j#'QUEUE_NAME' as queue;
c = group b by (id, user, queue) parallel 10;
d = foreach c generate group.user, group.queue, COUNT(b);
dump d;

All of the mentioned

a = load '/mapred/history/done' using HadoopJobHistoryLoader() as (j:map[], m:map[], r:map[]);
b = foreach a generate j#'PIG_SCRIPT_ID' as id, j#'USER' as user, j#'JOBNAME' as script_name, 
         (Long) j#'SUBMIT_TIME' as start, (Long) j#'FINISH_TIME' as end;
c = group b by (id, user, script_name)
d = foreach c generate group.user, group.script_name, (MAX(b.end) - MIN(b.start)/1000;
dump d;

a = load '/mapred/history/done' using HadoopJobHistoryLoader() as (j:map[], m:map[], r:map[]);
b = for a generate j#'PIG_SCRIPT_ID' as id, j#'USER' as user, j#'JOBNAME' as script_name, 
         (Long) j#'SUBMIT_TIME' as start, (Long) j#'FINISH_TIME' as end;
c = group b by (id, user, script_name)
d = for c generate group.user, group.script_name, (MAX(b.end) - MIN(b.start)/1000;
dump d;

9. Which of the following will remove the resource(s) from the distributed cache?

all of the mentioned

delete ARCHIVE[S] <filepath>*

delete FILE[S] <filepath>*

delete JAR[S] <filepath>*

10. Pig Latin is _______ and fits very naturally in the pipeline paradigm while SQL is instead declarative.

all of the mentioned

functional

declarative

procedural