Most viewed questions in Big Data Hadoop

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Why Hadoop is not implemented using MPI?

 One of the big features of Hadoop/map-reduce ...READ MORE

Dec 4, 2018 in Big Data Hadoop by Frankie
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675 views
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1 answer

Moving historyserver to another instance using curl command

Hi@Shilpa, You have double quotes inside a single ...READ MORE

Nov 9, 2020 in Big Data Hadoop by MD
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673 views
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Mention what is the Hadoop MapReduce APIs contract for a key and value class?

Hey, For a key and value class, there ...READ MORE

Jun 10, 2019 in Big Data Hadoop by Gitika
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673 views
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1 answer

How to perform Near-real time analytics using Hadoop?

To perform Near-real time analytics, you have ...READ MORE

Apr 24, 2018 in Big Data Hadoop by kurt_cobain
• 9,390 points
673 views
+1 vote
1 answer

Is it necessary to use Zookeeper in Hadoop Stack?

ZooKeeper is a centralized service for maintaining ...READ MORE

Mar 27, 2018 in Big Data Hadoop by Ashish
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673 views
+1 vote
1 answer

How to change columname in a dataframe

Hi@shanmugam, You can change your column by using ...READ MORE

May 21, 2020 in Big Data Hadoop by MD
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671 views
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Index LZO files

You can do it using the following ...READ MORE

Jul 24, 2019 in Big Data Hadoop by Rishi
670 views
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1 answer

How to set authentication for Kerberos in Hue?

To set the authentication for Solr clients ...READ MORE

May 27, 2019 in Big Data Hadoop by Jimmy
670 views
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1 answer

HA ranger KMS ,

Hi@Shilpa, If you have installed Ranger through Ambari ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
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669 views
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Hadoop Namenode start issue

Try restarting the master: $ sudo reboot $ sudo ...READ MORE

May 22, 2019 in Big Data Hadoop by Rishi
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1 answer

What is a pig script?

Hey, Pig script is nothing but a set ...READ MORE

May 7, 2019 in Big Data Hadoop by Gitika
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666 views
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How to use sqoop import?

Here is an example of import command. ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
• 69,230 points
666 views
–1 vote
1 answer

Hadoop cluster is not running in vm

First check if all daemons are running: sudo ...READ MORE

Dec 26, 2018 in Big Data Hadoop by Omkar
• 69,230 points
665 views
0 votes
1 answer

Testing methods used by a Hadoop developer ?

As such, there is no exact way ...READ MORE

Mar 26, 2018 in Big Data Hadoop by Ashish
• 2,650 points
664 views
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Designing Schema in HBase

Just create a single table with two ...READ MORE

Aug 6, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
663 views
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How to add filter for groups in Hue?

Open the Hue configuration file Search for [[ldap]] section Search for [[[groups]]] section Set the ...READ MORE

May 28, 2019 in Big Data Hadoop by Karan
662 views
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what is Region keyword and and store keyword in Hbase?

Hey, In HBase, tables are split into regions ...READ MORE

May 20, 2019 in Big Data Hadoop by Gitika
• 65,910 points
662 views
0 votes
1 answer

UnsupportedClassVersionError while running Mapreduce program.

Seems like the jar file was not ...READ MORE

Jan 18, 2019 in Big Data Hadoop by Omkar
• 69,230 points
662 views
0 votes
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Map reduce history moving instance using curl .

Hi@Shilpa, First thing, you will lose your metadata. ...READ MORE

Nov 9, 2020 in Big Data Hadoop by MD
• 95,440 points
661 views
0 votes
1 answer

How to set Hue Plugin for JobTracker on a different host?

When the JobTracker and the Hue Server ...READ MORE

May 24, 2019 in Big Data Hadoop by Jishan
660 views
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2 answers

How does Hadoop/Spark is used for building large analytics report?

The best possible framework for this task ...READ MORE

Aug 7, 2018 in Big Data Hadoop by kurt_cobain
• 9,390 points
660 views
0 votes
1 answer

what is pig in big data?

Pig is a high-level programming language for ...READ MORE

Jan 7, 2022 in Big Data Hadoop by Edureka
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659 views
0 votes
1 answer

What skills are required to be a Hadoop developer?

Hi@akhtar, To become a Hadoop developer, you should ...READ MORE

May 15, 2020 in Big Data Hadoop by MD
• 95,440 points
659 views
–1 vote
1 answer

Jobtracker and tasktracker is nor running.

Hi. You'll need to run start-mapred.sh if you want the ...READ MORE

Jan 19, 2019 in Big Data Hadoop by Omkar
• 69,230 points
659 views
0 votes
1 answer

How to use jar file without putting it in hdfs?

If by "using", you mean distributing it, ...READ MORE

Dec 6, 2018 in Big Data Hadoop by Omkar
• 69,230 points
659 views
+1 vote
1 answer

Reading Performance in Hadoop Cluster

For speeding up reading performance of your ...READ MORE

Jul 25, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
659 views
0 votes
1 answer

configure Cassendra in Linux system?

Hi@akhtar, To install cassandra in your system, follow ...READ MORE

Apr 1, 2020 in Big Data Hadoop by MD
• 95,440 points
658 views
0 votes
1 answer

Hdfs cluster and Master/standby Machine

Client submits job to Namenode. To achieve this, Client ...READ MORE

Jun 19, 2019 in Big Data Hadoop by Raj
658 views
0 votes
1 answer

Hive: Display column to which there is SELECT access

You can use the following query to ...READ MORE

Jun 3, 2019 in Big Data Hadoop by Pratham
657 views
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1 answer

Apache Spark vs MapReduce

Both Spark and Hadoop MapReduce are used ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
• 69,230 points
655 views
+1 vote
1 answer

How to check a HDFS directory size?

Hi@akhtar, You can check the size of the ...READ MORE

Oct 5, 2020 in Big Data Hadoop by MD
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654 views
0 votes
1 answer

Can we use different i/p and o/p format classes in mapreduce code?

Yes, InputFormatClass and OutputFormatClass are independent of ...READ MORE

Jul 10, 2019 in Big Data Hadoop by Jimmy
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1 answer

Power of a number in Impala

Suppose you have fetched two values X ...READ MORE

Jun 6, 2019 in Big Data Hadoop by Reshma
654 views
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1 answer

Determining HDFS space in a cluster?

There are two ways to determine available ...READ MORE

Aug 16, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
654 views
0 votes
1 answer

What is the difference between Big Data and Data Mining?

Big data and data mining are two ...READ MORE

Aug 23, 2018 in Big Data Hadoop by Frankie
• 9,830 points
652 views
0 votes
1 answer

What is the function of getLocalCacheArchives method?

We use distributed cache to share those ...READ MORE

Apr 29, 2018 in Big Data Hadoop by Shubham
• 13,490 points
652 views
0 votes
1 answer

Explain the CLI in Zookeeper?

Hey, ZooKeeper Command Line Interface (CLI) is used ...READ MORE

May 24, 2019 in Big Data Hadoop by Gitika
• 65,910 points
651 views
0 votes
1 answer

How to access different directories in a Hadoop cluster?

You need to configure the client to ...READ MORE

Sep 18, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
650 views
0 votes
1 answer

How to change WebHCat default port?

The default port configuration is stored in ...READ MORE

Jun 4, 2019 in Big Data Hadoop by Hari
647 views
0 votes
1 answer

Configure Oozie to use MariaDB

Add the following properties in the oozie-site.xml file, it ...READ MORE

Jun 4, 2019 in Big Data Hadoop by Esha
646 views
0 votes
1 answer

Getting some warning/error while loading java file using Hbase commands

In your code, you have set some ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
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645 views
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1 answer

Usage: java FsShell [-put <localsrc> ... <dst>]

Hi@akhtar, You are trying to upload your file ...READ MORE

Sep 25, 2020 in Big Data Hadoop by MD
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644 views
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1 answer

Can I use Amazon Web Services for free?

If you would like to use AWS ...READ MORE

Apr 25, 2019 in Big Data Hadoop by ravikiran
• 4,620 points
644 views
0 votes
1 answer

Why Hadoop is not implemented using Message Passing Interface (MPI)?

One of the big features of Hadoop/map-reduce ...READ MORE

Sep 21, 2018 in Big Data Hadoop by Frankie
• 9,830 points
644 views
0 votes
1 answer

What are the properties that have to be mentioned in . properties in Oozie?

Hey, These are the listed properties that need ...READ MORE

Jun 26, 2019 in Big Data Hadoop by Gitika
• 65,910 points
643 views
0 votes
0 answers

WARNING: Use of this script to execute namenode is deprecated. WARNING:

am getting the following errot when i ...READ MORE

Nov 10, 2021 in Big Data Hadoop by anonymous
• 140 points
641 views
0 votes
1 answer

What is DML in Hive?

Hi, DML is Data Manipulation Language. DML statements are ...READ MORE

May 15, 2019 in Big Data Hadoop by Gitika
• 65,910 points
641 views
0 votes
1 answer

How to use scala map as mutable map?

By default, Scala uses an immutable Map. ...READ MORE

Nov 17, 2020 in Big Data Hadoop by Gitika
• 65,910 points
639 views
0 votes
1 answer

Update hdfs data before stroring in MySql

Yes, you can update the data before ...READ MORE

Jan 27, 2019 in Big Data Hadoop by Omkar
• 69,230 points
639 views
0 votes
1 answer

Why is using Combiner function not preferred in shuffling?

Combiner function is not preferred because when ...READ MORE

Jan 23, 2019 in Big Data Hadoop by Omkar
• 69,230 points
639 views