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Hadoop Interview Questions and Answers
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Questions
Hadoop
0
votes
Explain the process of spilling in MapReduce.
asked
Nov 24, 2020
in
Hadoop
by
rahuljain1
#mapreduce-spilling
#mapreduce-process
0
votes
What is the role of the OutputCommitter class in a MapReduce job?
asked
Nov 24, 2020
in
Hadoop
by
rahuljain1
#output-committer
#mapreduce-jobs
0
votes
What do you mean by map-side join and reduce-side join in MapReduce?
asked
Nov 24, 2020
in
Hadoop
by
rahuljain1
#mapreduce-map-side
map-side
0
votes
How is identity mapper different from chain mapper?
asked
Nov 24, 2020
in
Hadoop
by
rahuljain1
#hadoop-mapper
#mapper
0
votes
What is speculative execution in Hadoop?
asked
Nov 24, 2020
in
Hadoop
by
rahuljain1
#hadoop-speculative-execution
#hadoop-execution
+1
vote
Hadoop Interview Questions and Answer, HDFS and MapReduce Questions
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#hadoop-interview-questions
0
votes
How to submit extra files(jars, static files) for MapReduce job during runtime?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#mapreduce-job-run-time
0
votes
What is a Speculative Execution in Hadoop MapReduce?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#speculative-execution
+1
vote
What is the fundamental difference between a MapReduce InputSplit and HDFS block?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#mapreduce-inputsplit
0
votes
What do you mean by shuffling and sorting in MapReduce?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#mapreduce-sorting
0
votes
What happens if the number of reducers is 0 in Hadoop?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#reducer-hadoop
0
votes
What is the difference between Reducer and Combiner in Hadoop MapReduce?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#reducer-vs-combiner
+1
vote
How many Reducers run for a MapReduce job in Hadoop?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#mapreduce-job
+1
vote
How many Mappers run for a MapReduce job in Hadoop?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#mapreduce-job
0
votes
Why MapReduce uses the key-value pair to process the data?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#mapreducuse
0
votes
What is the key- value pair in MapReduce?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#mapreduce-key-value
0
votes
Why Hadoop MapReduce?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#why-mapreduce
0
votes
What is Hadoop MapReduce?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#hadoop-mapreduce
0
votes
If DataNode increases, then do we need to upgrade NameNode?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#datanode-
#namenode
+1
vote
What are file permissions in HDFS and how HDFS check permissions for files or directory?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#hdfs-file-permission
0
votes
Is Namenode machine same as DataNode machine as in terms of hardware?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#namenode-machine
0
votes
How would you check whether your NameNode is working or not?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#namenode-working
0
votes
What is Disk Balancer in Hadoop?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#disk-baancer
0
votes
Explain Erasure Coding in Hadoop?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#erasure-coding
0
votes
Explain the Single point of Failure in Hadoop?
asked
Nov 8, 2020
in
Hadoop
by
rahuljain1
#single-point-of-failure
0
votes
What do you mean by the High Availability of a NameNode in Hadoop HDFS?
asked
Nov 7, 2020
in
Hadoop
by
SakshiSharma
#hadoop-high-availability
0
votes
Explain Hadoop Archives?
asked
Nov 7, 2020
in
Hadoop
by
SakshiSharma
#hadoop-archives
0
votes
Why HDFS performs replication, although it results in data redundancy?
asked
Nov 7, 2020
in
Hadoop
by
SakshiSharma
#hdfs-replication
+1
vote
How to copy a file into HDFS with a different block size to that of existing block size configuration?
asked
Nov 7, 2020
in
Hadoop
by
SakshiSharma
#hdfs-copy
0
votes
Why HDFS stores data using commodity hardware despite the higher chance of failures?
asked
Nov 7, 2020
in
Hadoop
by
SakshiSharma
#hdfs-store
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