Most voted questions in Big Data Hadoop

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How to provide read-only access to hive views to end users?

I have created some hive tables in ...READ MORE

Feb 18, 2021 in Big Data Hadoop by Jnanaranjan
edited Mar 4 • 177 views
0 votes
0 answers

Hadoop MapReduce - Join of two files and Computation on grouped values

I am fairly new to Hadoop and ...READ MORE

Jan 20, 2021 in Big Data Hadoop by anonymous
edited Mar 4 • 158 views
0 votes
0 answers

Hadoop Datanode runs only once and then does not start again on Windows 10

I was trying to install Hadoop and ...READ MORE

Jan 7, 2021 in Big Data Hadoop by Mueez
edited Mar 4 • 178 views
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0 answers

What are the pros and cons of parquet format compared to other formats?

Hi Team, I am new to Hadoop I ...READ MORE

Dec 21, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 2,531 views
0 votes
0 answers

What is the difference between partitioning and bucketing a table in Hive ?

Hi Team, I am new to Hive. I ...READ MORE

Dec 20, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 1,968 views
0 votes
1 answer

What is the purpose of shuffling and sorting phase in the reducer in Map Reduce?

Hi@akhtar, Shuffle phase in Hadoop transfers the map output from ...READ MORE

Dec 20, 2020 in Big Data Hadoop by MD
 • 95,460 points • 8,335 views
0 votes
1 answer

How to show all partitions of a table in Hive?

Hi@akhtar, You can list down all the partitions ...READ MORE

Dec 18, 2020 in Big Data Hadoop by MD
 • 95,460 points • 6,465 views
0 votes
1 answer

Is there any way to get the column name along with the output while execute any query in Hive?

If we want to see the column ...READ MORE

Dec 8, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 2,693 views
0 votes
1 answer

Where does hive stores its table?

With an external table the data itself ...READ MORE

Dec 7, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 1,132 views
0 votes
1 answer

How input splits are done when 2 blocks are spread across different nodes?

Hadoop doesn't copy the blocks to the ...READ MORE

Dec 7, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 1,901 views
0 votes
1 answer

How do I split a string on a delimiter in Bash?

You can set the internal field separator (IFS) variable, ...READ MORE

Dec 7, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 1,454 views
0 votes
1 answer

Name node is in safe mode. Not able to leave

In order to forcefully let the namenode ...READ MORE

Dec 7, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 2,647 views
0 votes
1 answer

I am getting this log4j:ERROR setFile(null,true) call failed. java.io.FileNotFoundException: /ozone.log (Read-only file system)

Hi@Raj, I think you need to provide permission ...READ MORE

Dec 4, 2020 in Big Data Hadoop by MD
 • 95,460 points • 9,504 views
0 votes
1 answer

How can I import data from mysql to hive tables with incremental data?

Hi@dharmendra, It is common to perform one-time ingestion ...READ MORE

Nov 23, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,617 views
0 votes
1 answer

If i enable zookeeper secrete manager getting java file not found

Hey, @Shilpa, What did you set the ownership ...READ MORE

Nov 23, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 885 views
0 votes
2 answers

How do I output the results of a HiveQL query to CSV?

Hi, The insert overwrite directory is running in ...READ MORE

Dec 18, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 9,308 views
0 votes
2 answers

How to know Hive and Hadoop versions from command prompt?

Hi, Hadoop and hive have their individual commands. ...READ MORE

Dec 18, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 13,904 views
0 votes
1 answer

How to set variables in HIVE scripts

You need to use the special hiveconf for variable ...READ MORE

Nov 20, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 9,144 views
0 votes
1 answer

Difference between Pig and Hive? Why have both? [closed]

The hive was designed to appeal to ...READ MORE

Nov 20, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 945 views
0 votes
1 answer

User:hdfs not allowed to do 'DECRYPT_EEK' on 'key'.

Hi@Shilpa, I don't think you have given permission ...READ MORE

Nov 20, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,021 views
0 votes
1 answer

copyFromLocal: `/home/SANDHYA/downloads/game.csv': No such file or directory

Hi@Namrata, I think you are using the wrong ...READ MORE

Nov 19, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,689 views
0 votes
1 answer

How to use scala Map size() method?

The size() is utilized to find the number of ...READ MORE

Nov 17, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 1,211 views
0 votes
1 answer

error: value update is not a member of scala.collection.immutable.Map[String, Int]

Yes, If you try to update the value of ...READ MORE

Nov 17, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 6,142 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
 • 65,730 points • 1,078 views
0 votes
1 answer

How to create Scala Maps?

Maps can be created in different ways ...READ MORE

Nov 17, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 834 views
0 votes
1 answer

How to create an objects using a keyword new?

Example import java.io._ class Point(val xc: Int, val yc: ...READ MORE

Nov 17, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 893 views
0 votes
1 answer

How to declare a variable in Scala?

The following is an example program that ...READ MORE

Nov 16, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 992 views
0 votes
1 answer

How to import scala packages?

Scala packages can be imported so that ...READ MORE

Nov 16, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 963 views
0 votes
1 answer

How to write a Scala program in script mode?

Open notepad and add the following code ...READ MORE

Nov 16, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 1,439 views
0 votes
1 answer

How to execute scala programming?

We can execute a Scala program in ...READ MORE

Nov 16, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 1,120 views
0 votes
1 answer

How to start working with scala?

Scala can be installed on any UNIX ...READ MORE

Nov 16, 2020 in Big Data Hadoop by Gitika
 • 65,730 points • 919 views
0 votes
1 answer

Sqoop practice in Edureka VM

Hi, It is the same for all the ...READ MORE

Nov 16, 2020 in Big Data Hadoop by MD
 • 95,460 points • 834 views
0 votes
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
 • 95,460 points • 1,341 views
0 votes
1 answer

Zookeeper server going down frequently.

Hi@B, There may be several reasons behind this. ...READ MORE

Nov 9, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,007 views
0 votes
1 answer

HDP Upgrade Issue in 2.6.5.

Hi@B, There is a problem with the version. ...READ MORE

Nov 9, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,163 views
0 votes
1 answer

Validating HA for ranger KMS

Hi@Shilpa, It seems your user doesn't have the ...READ MORE

Nov 9, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,437 views
0 votes
1 answer

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
 • 95,460 points • 1,176 views
0 votes
2 answers

Unable to start YARN daemons. Error: Could not find or load main class org.apache.hadoop.yarn.server.resourcemanager.ResourceManager

Hi@Akshitha, This seems like a path issue. you ...READ MORE

Nov 9, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,239 views
0 votes
1 answer

Ranger Kms having multiple instance enabled.

Hi@Shllpa, First, you need to check the network ...READ MORE

Oct 23, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,897 views
0 votes
1 answer

How to display the Access Control Lists (ACLs) of files and directories in HDFS?

Hi@akhtar, You can see the Access Control Lists (ACLs) ...READ MORE

Oct 20, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,181 views
0 votes
1 answer

Copy a directory from one node in the cluster to another in HDFS.

Hi@akhtar, You can copy a directory from one ...READ MORE

Oct 20, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,834 views
0 votes
1 answer

Drop an index from a Hive table.

Hi@akhtar, You can drop an index from the ...READ MORE

Oct 19, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,076 views
0 votes
1 answer

How to create an index on Hive table?

Hi@akhtar, An Index is nothing but a pointer ...READ MORE

Oct 19, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,611 views
0 votes
1 answer

Drop a table in Hive.

Hi@akhtar, When you drop a table from Hive ...READ MORE

Oct 19, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,233 views
0 votes
1 answer

How to add a column in Hive table?

Hi@akhtar, You can use the alter table command ...READ MORE

Oct 19, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,477 views
0 votes
1 answer

How to rename the Hive table?

Hi@akhtar, You can rename the table name in ...READ MORE

Oct 19, 2020 in Big Data Hadoop by MD
 • 95,460 points • 14,239 views
0 votes
1 answer

Ranger kms is not coming up

Hi@Shilpa, There may be lots of reasons behind ...READ MORE

Oct 19, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,519 views
0 votes
1 answer

How to write Reducer code for Hadoop?

Hi@akhtar, You can create a reducer code for ...READ MORE

Oct 16, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,214 views
0 votes
1 answer

How to write mapper code for Hadoop in Python?

Hi@akhtar, Any job in Hadoop must have two ...READ MORE

Oct 16, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,055 views
0 votes
1 answer

How to find the status of MapReduce Job?

Hi@akhtar, You can run the Hadoop Job command ...READ MORE

Oct 16, 2020 in Big Data Hadoop by MD
 • 95,460 points • 1,195 views
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