Trending questions in Big Data Hadoop

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Checkpointing in Hadoop

Checkpointing is the process of combining the ...READ MORE

Jul 3, 2018 in Big Data Hadoop by Data_Nerd
 • 2,390 points • 2,630 views
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2 answers

What is the difference between the Smart Data Access of SAP HANA and SAP HANA Vora?

Hadoop: Used to store Big Data in ...READ MORE

Jun 21, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 3,096 views
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1 answer

Channel in Flume

 A transient store that receives the events ...READ MORE

Jul 17, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 1,957 views
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1 answer

Why does my yarn application not have logs even with logging enabled?

yarn application -list command shows you all ...READ MORE

Mar 19, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 7,148 views
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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 • 6,732 views
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Hive Precedence Order

SET Command in HIVE The command line –hiveconf ...READ MORE

Jul 9, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 2,098 views
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How to find the used cache in HDFS

hdfs dfsadmin -report This command tells fs ...READ MORE

May 4, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 4,860 views
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1 answer

Is there any way to pull data from Mainframe to Hadoop?

First of all, COBOL is a programming ...READ MORE

May 21, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,993 views
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1 answer

I am getting error while starting the Hadoop Daemons i.e. ResourceManger & NodeManager in Hadoop 3

According to me the error is because ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 5,513 views
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Java MapReduce error saying No FileSystem for scheme:hdfs

The problem is with the dependencies. The ...READ MORE

May 9, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 4,404 views
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1 answer

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
 • 9,350 points • 5,962 views
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1 answer

Is there any way to setup Hadoop nodes (data nodes/namenodes) to use multiple volumes/disks?

Datanodes can store blocks in multiple directories ...READ MORE

Jun 20, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,542 views
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How to analyze block placement on datanodes and rebalancing data across Hadoop nodes?

HDFS provides a tool for administrators i.e. ...READ MORE

Jun 21, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,477 views
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What are the various ways to import files into HDFS?

There are various tools and frameworks available ...READ MORE

Apr 13, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 5,454 views
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1 answer

MapFile in Pig

MapFile is a class which serves file-based ...READ MORE

Jul 6, 2018 in Big Data Hadoop by Data_Nerd
 • 2,390 points • 1,836 views
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1 answer

NAS and HDFS Comparison

NAS stands for Network-attached Storage and is ...READ MORE

Jun 11, 2018 in Big Data Hadoop by Data_Nerd
 • 2,390 points • 2,892 views
0 votes
1 answer

Getting error in command hdfs dfs -mkdir

You are getting this error because the ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 5,336 views
0 votes
1 answer

NameNode & DataNode memory

Name Node only store metadata which is ...READ MORE

Jun 12, 2018 in Big Data Hadoop by Data_Nerd
 • 2,390 points • 2,730 views
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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 • 6,085 views
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1 answer

Hadoop giving java.io.IOException, in mkdir Java code.

I am not sure about the issue. ...READ MORE

May 3, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 4,376 views
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1 answer

Different partitoners in Cassandra

Murmur3Partitioner is the default partitioner. It is ...READ MORE

Jun 27, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,976 views
0 votes
1 answer

Is there any way to load data from MySql to HDFS?

The generic command i.e used to import ...READ MORE

Apr 10, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 5,298 views
0 votes
1 answer

Killing an Application from ResourceManager Web UI

In hadoop v2.7.1, if you open the ...READ MORE

Apr 23, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 4,725 views
0 votes
1 answer

Gossip Protocol features.

Gossip Protocol in Cassandra is a peer-to-peer ...READ MORE

Jun 26, 2018 in Big Data Hadoop by Data_Nerd
 • 2,390 points • 1,883 views
0 votes
1 answer

What is the command to find the free space in HDFS?

You can use dfsadmin which runs a ...READ MORE

Apr 29, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 4,337 views
0 votes
1 answer

How can I write text in HDFS using CMD?

Hadoop put & appendToFile only reads standard ...READ MORE

Apr 27, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 4,402 views
0 votes
1 answer

Hadoop Command to merge edit logs with fsimage

You can use this command to save ...READ MORE

May 11, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 3,776 views
0 votes
1 answer

Does setup & clean methods in Hadoop MapReduce is executed after each task?

Setup & cleanup methods are executed after ...READ MORE

May 8, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 3,868 views
0 votes
1 answer

Why Apache Pig is used instead of Hadoop?

As you know writing mapreduce programs in ...READ MORE

May 8, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 3,876 views
0 votes
1 answer

Is it compulsory to have the hadoop user as sudo user?

No, it is not important to have ...READ MORE

May 8, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 3,770 views
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1 answer

Is there any way to include a python package with Hadoop streaming job?

See I don't know the answer to ...READ MORE

May 10, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,651 views
0 votes
1 answer

Getting error in JAVA_HOME variable.

First of all check the hadoop version ...READ MORE

May 11, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 3,569 views
0 votes
1 answer

out of Memory Error in Hadoop

See if you can share the screenshot ...READ MORE

May 22, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,081 views
0 votes
1 answer

Is a HDFS block sequential ?

It seems like you are confused between the ...READ MORE

May 21, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,104 views
0 votes
1 answer

Hadoop job getting executed in local mode only?

Basically, you have not configured the mapreduce.framework.name ...READ MORE

May 3, 2018 in Big Data Hadoop by Atul
 • 10,240 points • 3,846 views
0 votes
1 answer

Disabling Kerberos authentication in Hadoop

Make the following changes: core-site.xml(Hadoop_Dir/etc/hadoop): ...READ MORE

May 16, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 3,254 views
0 votes
1 answer

Sqoop vs distCP

DistCP utility can be used to transfer ...READ MORE

May 30, 2018 in Big Data Hadoop by Data_Nerd
 • 2,390 points • 2,562 views
0 votes
1 answer

What is Speculative Execution?

If a node is executing a task ...READ MORE

Jun 18, 2018 in Big Data Hadoop by shams
 • 3,670 points • 1,727 views
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1 answer

NameNode without any data

There does not exist any NameNode without ...READ MORE

May 29, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 2,544 views
0 votes
1 answer

Changing hostname in fs.default.name property puts Hadoop in safemode

First of all, in Safe mode the ...READ MORE

Apr 27, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 3,898 views
0 votes
1 answer

Moving files in Hadoop using the Java API?

I would recommend you to use FileSystem.rename(). ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 4,386 views
0 votes
1 answer

HDFS usage for small files

Well, the HDFS works more reliably with ...READ MORE

Jun 12, 2018 in Big Data Hadoop by BigData_is_my_ex
 • 1,844 views
0 votes
1 answer

Replication and Calculations

Since there are 3 nodes, when we ...READ MORE

Jun 11, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 1,886 views
0 votes
1 answer

Hadoop query regarding setJarByClass method of Job class

setJarByClass method basically tells the nodes where ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 4,334 views
0 votes
1 answer

What is the difference between a zero reducer and identity reducer in Hadoop Mapreduce?

A Zero reducer as the name suggests ...READ MORE

Apr 10, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 4,502 views
0 votes
1 answer

JobTracker Task Scheduling

The task tracker send out heartbeat messages ...READ MORE

Jun 5, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 2,068 views
0 votes
1 answer

How do we authenticate user from http.signature.secret file?

hadoop.http.authentication.signature.secret.file: The signature secret file for signing ...READ MORE

Apr 24, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 3,795 views
0 votes
1 answer

What are some of the famous visualization tools which can be integrated with Hadoop & Hive?

I have personally used two visualization tools ...READ MORE

May 1, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 3,475 views
0 votes
1 answer

How to create a FileSystem object that can be used for reading from and writing to HDFS?

Read operation on HDFS In order to read ...READ MORE

Mar 21, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points
edited Mar 22, 2018 by nitinrawat895 • 5,187 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 • 4,834 views
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