Exam (elaborations)
HDFS Exam – Questions With Accurate Solutions
- Course
- Institution
HDFS Exam – Questions With Accurate Solutions
[Show more]
Content preview
HDFS Exam – Questions With Accurate Solutions1. A ________ serves as the master and there is only one NameNode per cluster.
a) Data Node
b) NameNode
c) Data block
d) Replication ✔️Answer: b
Explanation: All the metadata related to HDFS including the information about
data nodes, files stored on HDFS, and Replication, etc. are stored and
maintained on the NameNode.
2. Point out the correct statement :
a) DataNode is the slave/worker node and holds the user data in the form of
Data Blocks
b) Each incoming file is broken into 32 MB by default
c) Data blocks are replicated across different nodes in the cluster to ensure a
low degree of fault tolerance
d) None of the mentioned ✔️Answer: a
Explanation: There can be any number of DataNodes in a Hadoop Cluster.
3. HDFS works in a __________ fashion.
a) master-worker
b) master-slave
c) worker/slave
d) all of the mentioned ✔️Answer: a
Explanation: NameNode servers as the master and each DataNode servers as a
worker/slave
4. ________ NameNode is used when the Primary NameNode goes down.
a) Rack
b) Data
c) Secondary
d) None of the mentioned ✔️Answer: c
Explanation: Secondary namenode is used for all time availability and
reliability.
5. Point out the wrong statement :
, a) Replication Factor can be configured at a cluster level (Default is set to 3)
and also at a file level
b) Block Report from each DataNode contains a list of all the blocks that are
stored on that DataNode
c) User data is stored on the local file system of DataNodes
d) DataNode is aware of the files to which the blocks stored on it belong to
✔️Answer: d
Explanation: NameNode is aware of the files to which the blocks stored on it
belong to.
6. Which of the following scenario may not be a good fit for HDFS ?
a) HDFS is not suitable for scenarios requiring multiple/simultaneous writes
to the same file
b) HDFS is suitable for storing data related to applications requiring low
latency data access
c) HDFS is suitable for storing data related to applications requiring low
latency data access
d) None of the mentioned ✔️Answer: a
Explanation: HDFS can be used for storing archive data since it is cheaper as
HDFS allows storing the data on low cost commodity hardware while ensuring
a high degree of fault-tolerance.
7. The need for data replication can arise in various scenarios like :
a) Replication Factor is changed
b) DataNode goes down
c) Data Blocks get corrupted
d) All of the mentioned ✔️Answer: d
Explanation: Data is replicated across different DataNodes to ensure a high
degree of fault-tolerance.
8. ________ is the slave/worker node and holds the user data in the form of Data
Blocks.
a) DataNode
b) NameNode
c) Data block
d) Replication ✔️Answer: a
Explanation: A DataNode stores data in the [HadoopFileSystem]. A functional
filesystem has more than one DataNode, with data replicated across them.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LeCrae. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67163 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now