For the frequently accessed HDFS files the blocks are cached in
the memory of thedata node
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in the memory of thenamenode
Both
None of the Option is Correct
Category: Computer Science
Which among the following are the duties of the NameNodes
Which among the following are the duties of the NameNodes
manage file system namespace
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it is responsible for storing actual data
perform read-write operation as per request for the clients
None of the Option is Correct
If the IP address or hostname of a data node changes
If the IP address or hostname of a data node changes
the namenode need not update mapping between file name and block name
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there namenode has to be restarted
the data in that data node is lost forever
the namenode updates the mapping between file name and block name
A file in HDFS that is smaller than a single block size
A file in HDFS that is smaller than a single block size
occupies only the size it needs and not thefull block
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can span over multiple blocks
occupies the full block\s size.
cannot be stored in hdfs
What is HDFS?
What is HDFS?
storage layer
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batch processing engine
resource management layer
All Options are Correct
Which among the following command is used to copy a directory from onenode to another in HDFS?
Which among the following command is used to copy a directory from onenode to another in HDFS?
distcp
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rcp
dcp
drcp
Which utility is used for checking the health of an HDFS file system?
Which utility is used for checking the health of an HDFS file system?
fsck
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fchk
fsch
fcks
Which among the following is the correct statement
Which among the following is the correct statement
namenode stores metadata
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datanode manage file system namespace
namenode stores actual data
None of the Option is Correct
What is default replication factor?
What is default replication factor?
3
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2
5
4
The namenode knows that the data node is active using a mechanism known as
The namenode knows that the data node is active using a mechanism known as
heartbeats
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h-signal
data pulse
active pulse