Engineering Questions with Answers - Multiple Choice Questions
MCQs on Metrics in Hbase
1 - Question
_______ can change the maximum number of cells of a column family.
a) set
b) reset
c) alter
d) select
View Answer
Answer: c
Explanation: Alter is the command used to make changes to an existing table.
2 - Question
Point out the correct statement.
a) You can add a column family to a table using the method addColumn()
b) Using alter, you can also create a column family
c) Using disable-all, you can truncate a column family
d) None of the mentioned
View Answer
Answer: a
Explanation: Columns can also be added through HbaseAdmin.
3 - Question
Which of the following is not a table scope operator?
a) MEMSTORE_FLUSH
b) MEMSTORE_FLUSHSIZE
c) MAX_FILESIZE
d) All of the mentioned
View Answer
Answer: a
Explanation: Using alter, you can set and remove table scope operators such as MAX_FILESIZE, READONLY, MEMSTORE_FLUSHSIZE, DEFERRED_LOG_FLUSH, etc.
4 - Question
You can delete a column family from a table using the method _________ of HBAseAdmin class.
a) delColumn()
b) removeColumn()
c) deleteColumn()
d) all of the mentioned
View Answer
Answer: c
Explanation: Alter command also can be used to delete a column family.
5 - Question
Point out the wrong statement.
a) To read data from an HBase table, use the get() method of the HTable class
b) You can retrieve data from the HBase table using the get() method of the HTable class
c) While retrieving data, you can get a single row by id, or get a set of rows by a set of row ids, or scan an entire table or a subset of rows
d) None of the mentioned
View Answer
Answer: d
Explanation: You can retrieve an HBase table data using the add method variants in Get class.
6 - Question
__________ class adds HBase configuration files to its object.
a) Configuration
b) Collector
c) Component
d) None of the mentioned
View Answer
Answer: a
Explanation: You can create a configuration object using the create() method of the HbaseConfiguration class.
7 - Question
The ________ class provides the getValue() method to read the values from its instance.
a) Get
b) Result
c) Put
d) Value
View Answer
Answer: b
Explanation: Get the result by passing your Get class instance to the get method of the HTable class. This method returns the Result class object, which holds the requested result.
8 - Question
________ communicate with the client and handle data-related operations.
a) Master Server
b) Region Server
c) Htable
d) All of the mentioned
View Answer
Answer: b
Explanation: Region Server handle read and write requests for all the regions under it.
9 - Question
_________ is the main configuration file of HBase.
a) hbase.xml
b) hbase-site.xml
c) hbase-site-conf.xml
d) none of the mentioned
View Answer
Answer: b
Explanation: Set the data directory to an appropriate location by opening the HBase home folder in /usr/local/HBase.
10 - Question
HBase uses the _______ File System to store its data.
a) Hive
b) Imphala
c) Hadoop
d) Scala
View Answer
Answer: c
Explanation: The data storage will be in the form of regions (tables). These regions will be split up and stored in region servers.