BDA-UNIT-2

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