Trending questions in Big Data Hadoop

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Hadoop Map Reduce: java.lang.reflect.InvocationTargetException

I executed the same code and it ...READ MORE

Dec 17, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,699 views
–1 vote
1 answer

Changing map and reduce slots

Follow these steps to set the map ...READ MORE

Jan 5, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 996 views
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Hadoop: java.io.IOException: File could only be replicated to 0 nodes instead of minReplication (=1)

Try this, first stop all the daemons, ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 3,502 views
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How to access Hadoop counter values using API?

You can use the job object to access the ...READ MORE

Dec 31, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,155 views
0 votes
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What is the difference between Hive internal tables and external tables?

Hive has a relational database on the ...READ MORE

Nov 19, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 2,885 views
0 votes
1 answer

Apache Spark gives "Failed to load native-hadoop with error"

Seems like hadoop path is missing in java.library.path. ...READ MORE

Nov 22, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,749 views
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Hadoop plugin (1.0.3) for eclipse

When you have Hadoop Eclipse plugin installed ...READ MORE

Dec 28, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,215 views
0 votes
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MapReduce "cannot be resolved to a type" error

One of the reasons could be different ...READ MORE

Dec 18, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,601 views
0 votes
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Hadoop sqoop import not working. Error: ERROR manager.SqlManager: Error reading from database

In the command, try mentioning the driver ...READ MORE

Dec 5, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,152 views
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How to extract only few lines of data from HDFS?

Here also in case of Hadoop, it is ...READ MORE

May 2, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 11,516 views
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Issue While Running Oozie Sample Project

Hey @supriya.  Seems like you have not set ...READ MORE

Jan 4, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 875 views
0 votes
1 answer

Sqoop data transfer with SSL or SFtp

Sqoop supports SSL/TLS data transfer with the ...READ MORE

Dec 18, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,562 views
0 votes
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Not able to start MySql service

Hello. "The system never lies :-P".  The service ...READ MORE

Dec 26, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,204 views
0 votes
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How can anyone recover deleted HDFS data?

Yes, there is a trash policy in ...READ MORE

May 16, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 10,917 views
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How are blocks created while written file in hdfs?

Suppose we want to write a 1 ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,408 views
0 votes
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Hadoop Mapreduce: Error: Could not find or load main class com.sun.tools.javac.Main

You have to add HADOOP_CLASSPATH environment parameter: expor ...READ MORE

Oct 30, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 3,654 views
0 votes
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Extracting pig log messages

You can use the following commands in ...READ MORE

Jan 7, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 667 views
–1 vote
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Not able to execute mapreduce code

Follow the below steps to execute the ...READ MORE

Jan 7, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 693 views
0 votes
1 answer

Hadoop Hive Hbase: How to insert data into Hbase using Hive (JSON file)?

You can use the get_json_object function to parse the ...READ MORE

Nov 15, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,931 views
0 votes
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Hadoop backup and recovery tool and guidance

There are a few options for backup ...READ MORE

Jan 4, 2019 in Big Data Hadoop by Frankie
 • 9,830 points • 797 views
+1 vote
1 answer

Not able to start datanode in Hadoop

Follow these steps: Stop namenode Delete the datanode directory ...READ MORE

Dec 12, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,708 views
0 votes
1 answer

MySql connection problem "Cant connect to local mysql server through socket "var/lib/mysql/mysql.sock" .

First start the mysql server: service mysqld start To ...READ MORE

Dec 26, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,143 views
–1 vote
1 answer

Getting error when writing to HDFS. Unable to load native-hadoop library for your platform

Try this: sudo service hadoop-master restart After that try ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,474 views
0 votes
1 answer

What is -cp command in hadoop? How it works?

/user/cloudera/data1 is not a directory, it is ...READ MORE

Oct 17, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 4,171 views
0 votes
1 answer

Processing image in hdfs

If your block size is 64 MB, ...READ MORE

Dec 27, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,082 views
–1 vote
1 answer

How to restrict nodes that talk to namenode?

Step 1: Create includes file in /home/hadoop ...READ MORE

Jan 5, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 770 views
–1 vote
1 answer

Copying jar file into hadoop

hdfs dfs -put input_file_name output_location READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,391 views
0 votes
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How to securely transfer data from rdms to hdfs using sqoop?

Sqoop stores metadata in a repository and ...READ MORE

Dec 18, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,383 views
0 votes
1 answer

How do I install cloudera Hadoop without internet connection?

You can do that by selecting the ...READ MORE

Dec 12, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,633 views
–1 vote
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Job History Server edit logs

When the application master fails, each file ...READ MORE

Dec 26, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,048 views
0 votes
1 answer

Small files and HDFS blocks

Multiple files are not stored in a ...READ MORE

Nov 16, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,735 views
0 votes
1 answer

Hive ACID semantics

ACID stands for Atomicity, Consistency, Isolation, and Durability.  Until ...READ MORE

Jan 4, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 601 views
0 votes
1 answer

How can I calculate exact median with Apache Spark?

You need to sort RDD and take ...READ MORE

Oct 8, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 4,414 views
–1 vote
1 answer

Where does reduce take place in Hadoop MapReduce?

A MapReduce job usually splits the input data-set into ...READ MORE

Dec 18, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,369 views
–1 vote
1 answer

Issue with MySql Server connection

Try to restart the mysqld server and then login: sudo ...READ MORE

Jan 2, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 725 views
0 votes
1 answer

Hadoop Spark: __spark_lib.zip does not exist

To find this file, your HADOOP_CONF_DIR env ...READ MORE

Nov 15, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,747 views
0 votes
1 answer

Hadoop: Adding multiple inputs with a different mapper using python

hadoop jar hadoop-multiple-streaming.jar \ ...READ MORE

Nov 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,565 views
+1 vote
1 answer

What is difference between Hadoop Namenode HA and HDFS federation?

The main difference between HDFS High Availability ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,381 views
0 votes
1 answer

Pig CLI mode

Pig can be used in two modes: 1) ...READ MORE

Jan 4, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 550 views
–1 vote
1 answer

When to use Sqoop?

Sqoop is used to transfer any data ...READ MORE

Dec 31, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 751 views
0 votes
1 answer

How to use mountable HDFS on Centos?

Hey. You can use the following commands ...READ MORE

Nov 26, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,212 views
+1 vote
1 answer

Why minimum 3 Journal Nodes are required in Hadoop HA architecture?

Initially in Hadoop 1.x, the NameNode was ...READ MORE

Apr 20, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 11,657 views
0 votes
1 answer

How to execute wordcount in Hadoop?

Follow these steps: Step 1:  Import all these hadoop ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,200 views
0 votes
1 answer

Transfer data between 2 Tables having issues with Date conversion from string to Date datatype.

This can be solved making use of ...READ MORE

Dec 28, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 804 views
–1 vote
1 answer

Serde input and output

Input Processing Hive's execution engine (referred to as ...READ MORE

Dec 27, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 878 views
0 votes
1 answer

Can you build “Spark” with any particular Hadoop version?

Yes, one can build “Spark” for a specific ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,395 views
0 votes
0 answers

wordcount example not running on edureka vm

Hi, wordcount example failing on edureka vm(VM is ...READ MORE

Dec 25, 2018 in Big Data Hadoop by PRASAD
 • 120 points • 943 views
–1 vote
1 answer

How to Set cluster Rebalancer threshold

The command you are using is wrong. ...READ MORE

Jan 5, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 498 views
–1 vote
1 answer

How to start pyspark?

Follow these steps: First start hadoop daemons: cd $HADOOP_HOME/sbin ./start-all.sh Now ...READ MORE

Jan 3, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 537 views
0 votes
1 answer

What is distributed Cache in MapReduce Framework ?

Distributed Cache is an important feature provided ...READ MORE

Dec 7, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,675 views
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