Most answered questions in Big Data Hadoop

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How to configure secondary namenode in Hadoop 2.x ?

bin/hadoop-daemon.sh start [namenode | secondarynamenode | datanode ...READ MORE

Apr 6, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 1,550 views
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which one to choose for log analysis?

It is not about that you can ...READ MORE

Apr 6, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 554 views
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RDBMS Vs Hadoop

There are various challenges with RDBMS such ...READ MORE

Apr 6, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 652 views
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Different ports in a Hadoop cluster environment?

Below image will help you in understanding ...READ MORE

Apr 6, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,552 views
0 votes
1 answer

What is the use of sequence file in Hadoop?

Sequence files are binary files containing serialized ...READ MORE

Apr 6, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 9,227 views
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1 answer

Writing File into HDFS using spark scala

The reason you are not able to ...READ MORE

Apr 6, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 16,814 views
0 votes
1 answer

How to get started with Hadoop and do some development using Eclipse IDE?

Alright, there are couple of things that ...READ MORE

Apr 4, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 1,779 views
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1 answer

How to retrieve the list of sql (Hive QL) commands that has been executed in a hadoop cluster?

Well, what you can do is use ...READ MORE

Apr 4, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 13,705 views
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1 answer

Avro - Getting Started

Refer to the example given here. It's ...READ MORE

Apr 4, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 484 views
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Apache Hadoop Yarn example program

You can go to this location $Yarn_Home/share/hadoop/mapreduce . You'll ...READ MORE

Apr 4, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 964 views
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Will hadoop replace data warehousing?

Mostly the answer is yes hadoop is ...READ MORE

Apr 4, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 404 views
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Examples of real world big data open source applications

If you are looking for big data ...READ MORE

Apr 4, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 925 views
0 votes
1 answer

Hadoop: TaskTracker and JobTracker don't start with start-dfs.sh

You must run the start-dfs..sh too. So when ...READ MORE

Apr 4, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 1,241 views
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When hadoop-env.sh will be executed in hadoop

Yes you need to put in the ...READ MORE

Apr 3, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 1,060 views
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1 answer

When is an identity mapper/reducer used?

1.One of the simplest example of Iterative ...READ MORE

Apr 3, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 2,007 views
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1 answer

Error running hadoop mapreduce in Python using Hadoop Streaming

Hi As you write mapper and reducer program  ...READ MORE

Jan 21, 2020 in Big Data Hadoop by anonymous
 • 2,231 views
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1 answer

What Distributed Cache is actually used for in Hadoop?

Basically distributed cache allows you to cache ...READ MORE

Apr 3, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 1,865 views
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Where is Hadoop Classpath?

It is set in hadoop-config.sh. You can add ...READ MORE

Apr 2, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 4,238 views
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What's the difference between Hadoop and NoSQL ?

Let's start with the definitions Hadoop is an ...READ MORE

Apr 2, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 6,038 views
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How to practice programming with Hadoop?

Well there are multiple ways to solve ...READ MORE

Mar 30, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 2,678 views
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1 answer

How hadoop mapreduce job is submitted to worker nodes?

Alright, I think you are basically looking ...READ MORE

Mar 30, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 5,305 views
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1 answer

How to start working on Hadoop?

Ok, so basically, you are looking forward ...READ MORE

Mar 30, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 669 views
0 votes
1 answer

Not able to start Job History Server in Hadoop 2.8.1

You have to start JobHistoryServer process specifically ...READ MORE

Mar 30, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 2,340 views
0 votes
1 answer

Why we are configuring mapred.job.tracker in YARN?

I really dont know the reason behind ...READ MORE

Mar 29, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 1,631 views
0 votes
1 answer

What is the benefit of using CDH over other Distributors?

CDH is basically a packaged deal, where ...READ MORE

Mar 29, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 457 views
0 votes
1 answer

Is there a good online tutorial for Hadoop development on a Windows 7 machine?

I would suggest you go through this ...READ MORE

Mar 29, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 404 views
0 votes
1 answer

Hdfs Service Systemd - startup

I guess the issue you are facing ...READ MORE

Mar 29, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,570 views
0 votes
1 answer

What is difference between Oozie workflow, coordinator and bundle ?

Workflow does not have time specifications to ...READ MORE

Mar 29, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 2,804 views
0 votes
1 answer

Differences between Hadoop-common, Hadoop-core and Hadoop-client?

To help provide some additional details regarding ...READ MORE

Mar 29, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 2,847 views
0 votes
1 answer

hadoop: command not found

The reason you are getting hadoop as ...READ MORE

Mar 28, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 13,517 views
0 votes
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How to learn Big Data and Ecosystem ?

First understand Big Data and challenges associated ...READ MORE

Mar 27, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 675 views
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Is it possible to only install Hadoop HDFS?

First of all think of Hadoop as ...READ MORE

Mar 27, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 1,121 views
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1 answer

How does the HDFS Client knows the block size while writing?

HDFS is designed in a way where ...READ MORE

Mar 27, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 866 views
0 votes
1 answer

What is Hadoop Distribution ?

Some companies release or sell products that ...READ MORE

Mar 27, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 683 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
 • 2,650 points • 628 views
0 votes
1 answer

Hadoop absolute path - pwd ?

"hdfs dfs -pwd" does not exist because ...READ MORE

Mar 27, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 8,309 views
0 votes
1 answer

Hadoop on Windows - Training

If your primary objective is to learn ...READ MORE

Mar 27, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 816 views
0 votes
1 answer

How to programmatically access hadoop cluster where kerberos is enable?

Okay,here's the code snippet to work in the ...READ MORE

Mar 27, 2018 in Big Data Hadoop by coldcode
 • 2,080 points • 7,032 views
0 votes
1 answer

Other Distributed Alternatives to Big Data Hadoop

Yes, there are lot of alternatives to ...READ MORE

Mar 27, 2018 in Big Data Hadoop by coldcode
 • 2,080 points • 672 views
0 votes
1 answer

Moving data to hdfs using copyFromLocal command

Actually dfs.data.dir and dfs.name.dir have to point ...READ MORE

Mar 27, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 9,584 views
0 votes
1 answer

Copy file from HDFS to the local file system

There are two possible ways to copy ...READ MORE

Mar 27, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 16,507 views
0 votes
1 answer

How can we send data from MongoDB to Hadoop?

The MongoDB Connector for Hadoop reads data ...READ MORE

Mar 27, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,902 views
0 votes
1 answer

Can we use Apache Sqoop and Hive both together? What is the difference between the two?

Yes, you can. In fact many people ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,570 views
0 votes
1 answer

Hadoop on cassandra database

Regarding your question - there is a ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 494 views
0 votes
1 answer

Types of Hadoop Clusters

Below is the difference given between Standalone, ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,585 views
+1 vote
1 answer

Hadoop Installation Issue on Windows

Below is the main error you are ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 5,768 views
0 votes
1 answer

Which latest Hadoop version is stable?

Try Checking this website: http://hadoop.apache.org/releases.html. Here you will ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 4,957 views
0 votes
1 answer

What is hadoop.tmp.dir ?

hadoop.tmp.dir is used as the base for temporary ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 6,283 views
0 votes
1 answer

Relationship between Spark, Hadoop and Cassandra?

Spark is a distributed in memory processing ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,031 views
+1 vote
1 answer

Cassandra and Hadoop - realtime vs batch

Apache Hadoop, is a big data analytics ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,506 views
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