Trending 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
 • 9,350 points • 2,098 views
+1 vote
1 answer

I installed Spark but while executing command, I am getting ‘hadoop’ command not found error?

For accessing Hadoop commands & HDFS, you ...READ MORE

Mar 21, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 2,754 views
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1 answer

Why ResourceManager crashes after sometime or while accessing HDFS in Hadoop 2.8.1 and Ubuntu 16.04?

I was facing the same problem and ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,698 views
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1 answer

How to install and configure a multi-node Hadoop cluster?

I would recommend you to install Cent ...READ MORE

Mar 22, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 2,751 views
0 votes
1 answer

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 • 2,056 views
0 votes
1 answer

In which directory Hadoop should be installed?

You can install Hadoop anywhere. You just ...READ MORE

Apr 17, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,594 views
0 votes
1 answer

Getting error in Hadoop Streaming: Type mismatch in Key from Map

In Hadoop streaming you have to customize ...READ MORE

Apr 18, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 1,500 views
0 votes
1 answer

Error in Hadoop Mapreduce

The file that you are referring here ...READ MORE

Apr 19, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,411 views
0 votes
1 answer

Hadoop for data migration

You can use Hadoop for these kinds ...READ MORE

Apr 18, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,442 views
0 votes
1 answer

Replication Factor in Hadoop?

If you have provided a replication factor ...READ MORE

Apr 18, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,426 views
0 votes
1 answer

How to checkout Hadoop 2.6.0 from git

Clone the following Git repository: git clone git ...READ MORE

Apr 23, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,208 views
0 votes
1 answer

HortonWorks Hadoop encryption tools and data security

There are many tools available for encrypting ...READ MORE

Apr 20, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,321 views
0 votes
1 answer

What happend while formatting hadoop namenode?

Basically, NameNode is the master daemon that ...READ MORE

May 4, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 751 views
0 votes
1 answer

Where Big Data tools like Hadoop and Spark comes into picture when we talk about ETL?

When we talk about ETL, ETL means ...READ MORE

May 3, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 735 views
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1 answer

Map and Reduce task memory settings in Hadoop YARN

It's preferable and generally, it is recommended ...READ MORE

Apr 18, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,359 views
0 votes
1 answer

How to implement data locality in Hadoop MapReduce?

You can use this getFileBlockLocations method of ...READ MORE

Apr 20, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,266 views
0 votes
1 answer

Which is better Neo4j or HBASE ?

For your requirement, I would recommend you ...READ MORE

Apr 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 968 views
0 votes
1 answer

How Impala is fast compared to Hive in terms of query response?

Impala provides faster response as it uses MPP(massively ...READ MORE

Mar 21, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,515 views
0 votes
1 answer

How can we transfer a PDF file to HDFS?

You can easily upload any file to ...READ MORE

Apr 13, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,514 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 • 2,287 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 • 2,119 views
0 votes
1 answer

What does Context mean in Hadoop MapR terms ?

The new API makes extensive use of ...READ MORE

Apr 6, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,775 views
0 votes
0 answers

Are some Pig real time use cases available?

Can anyone provide me with some real ...READ MORE

Apr 21, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,200 views
0 votes
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
 • 9,350 points • 985 views
0 votes
1 answer

Why am I not able to see the Hadoop daemons that are running?

I guess you are starting the services ...READ MORE

Apr 18, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,235 views
0 votes
1 answer

HDFS Location in Hadoop?

Try using the same path where you ...READ MORE

Apr 19, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,200 views
0 votes
1 answer

What are the different ways to load data from Hadoop to Azure Data Lake?

I would recommend you to go through ...READ MORE

Apr 18, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 1,231 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
 • 9,350 points • 1,872 views
+2 votes
1 answer

Is Kafka and Zookeeper are required in a Big Data Cluster?

Apache Kafka is one of the components ...READ MORE

Mar 23, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,301 views
0 votes
1 answer

Hadoop vs Data Lake

A data lake is a storage repository that holds ...READ MORE

Mar 26, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 2,209 views
0 votes
1 answer

How to migrate/ change Hadoop 1.x maven project to Hadoop 2.x?

In Hadoop 2.2. most of the dependencies ...READ MORE

Apr 15, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,332 views
0 votes
1 answer

Hadoop single node cluster set up issues

As far as the error, there's a ...READ MORE

Apr 19, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,163 views
0 votes
1 answer

Why Java Code in Hadoop uses own Data Types instead of basic Data types?

Hadoop provides us Writable interface based data ...READ MORE

Apr 15, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,317 views
0 votes
1 answer

Getting error while building Hadoop core jar using ant.

I think you are missing libtool library. ...READ MORE

Apr 18, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 1,157 views
0 votes
1 answer

How to use custom FileInputFormat in MapReduce?

You have to override isSplitable method. ...READ MORE

Apr 10, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,487 views
0 votes
1 answer

Hadoop demo Code not working

You can use this command: "hadoop fs ...READ MORE

Apr 21, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,022 views
0 votes
1 answer

Is there any way to write "map only" Hadoop jobs ?

You can easily set the number of ...READ MORE

Apr 16, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,196 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 • 2,053 views
0 votes
1 answer

How Hadoop replication works?

dfs.replication is by default 3 and you ...READ MORE

Apr 19, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,031 views
0 votes
1 answer

Access DFS through Java API

It is because, may be you are ...READ MORE

Mar 23, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,178 views
0 votes
1 answer

Can one implement combiner and reducer separately?

Surely, you can use combiner separately along ...READ MORE

Apr 10, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 1,336 views
0 votes
1 answer

When was the first version of Hadoop released?

September 4, 2007 READ MORE

Apr 20, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 876 views
0 votes
1 answer

Why Hadoop is tightly bound to linux?

As far as I can tell, using ...READ MORE

Apr 19, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 894 views
0 votes
1 answer

Is there a way to rebalance single Datanode in Hadoop.

Currently Hadoop does not automatically do this. ...READ MORE

Apr 15, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,044 views
0 votes
1 answer

How to set a custom install directory for a deb package with fpm

Here's something that you can try... the last ...READ MORE

Mar 26, 2018 in Big Data Hadoop by Amrinder
 • 140 points • 1,904 views
0 votes
1 answer

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
 • 9,350 points • 1,484 views
0 votes
1 answer

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 • 1,482 views
0 votes
1 answer

Files for Configuring HDFS in Hadoop 2.2.0?

By default these Hadoop configuration files are ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 994 views
0 votes
1 answer

Getting error in Custom Input Format

Use this property directly to delimit the ...READ MORE

Apr 19, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 809 views
0 votes
1 answer

Declaring separator in the MapReduce(Hadoop 0.20)

In the new API you have to ...READ MORE

Apr 20, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 734 views
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