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WorksheetsBDA-UNIT-2
Total questions: 25
Worksheet time: 13mins
Filesystems that manage the storage across a network of machines are called______________
document filesystems
Excel filesystems
distributed filesystems
None
_____________is a filesystem designed for storing very large files with streaming data access patterns, running on clusters of commodity hardware.
YARN
HDFS
Map Reduce
all the above
HDFS is built around the idea that the most efficient data processing pattern is a_______
write-many, read-once-time pattern
write-once, read-once-time pattern
write-many, read-many-times pattern
write-once, read-many-times pattern
HDFS does not work well for some areas:
Low-latency data access
Multiple writers &
File modifications
High volume of data
None
_________maintains the filesystem tree and the metadata for all the files and directories in the tree.
Name Node
Data Node
Null Node
Application Node
Which is not a file system?
FTP
S3
SMPS
Local
Which is not an interface of Hadoop?
C
FUSE
HTTP
COBOL
_________method is used to retrieve a local filesystem instance.
getLocal()
get()
open()
seek()
_______method on FileSystem to permanently remove files or directories
clear()
delete()
destroy()
none
In Hadoop Distributed File System (HDFS), ________ is a policy that makes data more available and fault-tolerant by storing multiple copies of a file's blocks on different data nodes.
name node
federation
replication
none
in above example, how many blocks are made for the backup purpose?
4
3
10
12
_________ for a filesystem describes how reads and writes are visible for a file.
HDFS Federation
SPOF
Coherency Model
None
HDFS provides a way to force all buffers to be flushed to the datanodes via the .............. method on FSDataOutputStream
hflush()
flush()
fflush()
none
Hadoop comes with a useful program called ______for copying data to and from Hadoop filesystems in parallel.
cp
distcp
copy
none
____________ is implemented as a MapReduce job where the work of copying is done by the maps that run in parallel across the cluster. There are no reducers.
distcp
coherency model
HDFS
none
__________ is the process of redistributing data evenly across a cluster of computers to keep DataNodes healthy.
Load balance
Data Integrity
Cluster balancing
Node Balancing
________ in Hadoop is the process of ensuring that data is not lost or corrupted during storage or processing.
Coherency Model
MapReduce
Cluster Balancing
Data integrity
CRC-32 stands for:
32-byte cyclic redundancy check
32-bit cyclic redundancy check
32-bit circular redundancy check
32-bit cyclic random check
File compression brings two major benefits:
1. It reduces the space needed to store files, and
2. It slow up data transfer across the network or to or from disk.
Which of the following is correct
both 1 & 2 are correct
1 is true and 2 is false
1 is false and 2 is true
both 1 & 2 are false
which is NOT a compression formats of Hadoop?
Deflate
Snappy
LZO
WinRar
The _____ compressor from Google provides fast compression and decompression but compression ratio is less.
Snappy
bzip2
Deflate
gzip
short form of compressor-decompressor
Code
comdec
Codec
comde
______________ is essential in Hadoop because they allow developers to compress and decompress data for input and output.
Data Integrity
Codecs
Map Reduce
None
In the Hadoop the default block size is ____________
64 MB
164 MB
128 MB
16 MB
_________ enables horizontal scaling of the namespace, which is beneficial for large deployments or those that use many small files.
HDFS Federation
High Availability
MapReduce
None
