Most answered questions in Big Data Hadoop

+1 vote
1 answer

How does Hadoop process records split across block boundaries?

Interesting question, I spent some time looking ...READ MORE

Dec 7, 2020 in Big Data Hadoop by Gitika
 • 65,930 points • 393 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
 • 65,930 points • 1,535 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
 • 95,440 points • 7,735 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
 • 95,440 points • 947 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
 • 65,930 points • 362 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
 • 65,930 points • 6,407 views
+1 vote
1 answer

When to use Hadoop, HBase, Hive and Pig?

MapReduce is just a computing framework. HBase has ...READ MORE

Nov 20, 2020 in Big Data Hadoop by Gitika
 • 65,930 points • 671 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
 • 65,930 points • 355 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
 • 95,440 points • 1,881 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
 • 95,440 points • 919 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
 • 65,930 points • 535 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
 • 65,930 points • 4,560 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
 • 65,930 points • 476 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
 • 65,930 points • 332 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
 • 65,930 points • 333 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
 • 65,930 points • 373 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
 • 65,930 points • 376 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
 • 65,930 points • 745 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
 • 65,930 points • 526 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
 • 65,930 points • 305 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
 • 95,440 points • 464 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
 • 95,440 points • 466 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
 • 95,440 points • 1,596 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
 • 95,440 points • 588 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
 • 95,440 points • 585 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
 • 95,440 points • 495 views
+1 vote
1 answer

Not able to create kms key using ambari.

Hi@Shilpa, There may be a problem with your ...READ MORE

Nov 4, 2020 in Big Data Hadoop by MD
 • 95,440 points • 571 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
 • 95,440 points • 860 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
 • 95,440 points • 877 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
 • 95,440 points • 2,661 views
+1 vote
1 answer

How to copy file from Local file system to HDFS?

Hi@akhtar, You can copy files from your local ...READ MORE

Oct 20, 2020 in Big Data Hadoop by MD
 • 95,440 points • 2,249 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
 • 95,440 points • 981 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
 • 95,440 points • 857 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
 • 95,440 points • 392 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
 • 95,440 points • 1,408 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
 • 95,440 points • 9,267 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
 • 95,440 points • 811 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
 • 95,440 points • 542 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
 • 95,440 points • 478 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
 • 95,440 points • 555 views
0 votes
1 answer

Create hive table with location.

Hi@MD, We can also create a hive table ...READ MORE

Oct 16, 2020 in Big Data Hadoop by akhtar
 • 38,230 points • 361 views
0 votes
1 answer

How to create hive table without location?

Hi@akhtar, We can create a hive table for ...READ MORE

Oct 16, 2020 in Big Data Hadoop by MD
 • 95,440 points • 806 views
0 votes
1 answer

Error: Could not create the Java Virtual Machine in Hadoop.

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

Oct 16, 2020 in Big Data Hadoop by MD
 • 95,440 points • 1,616 views
0 votes
1 answer

How to update the existing record in HDFS?

Hi@akhtar, HDFS follows Write Once Read Many times ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
 • 95,440 points • 2,218 views
0 votes
1 answer

IOException: All datanodes are bad.

Hi@akhtar, As we know HDFS works in a ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
 • 95,440 points • 1,553 views
0 votes
1 answer

ERROR: Cannot set priority of datanode process

Hi@akhtar, You need to set JAVA_HOME and HADOOP_HOME ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
 • 95,440 points • 9,836 views
0 votes
1 answer

Checksum verification in Hadoop.

Hi@akhtar, Hadoop filesystem has Command to check the checksum ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
 • 95,440 points • 1,254 views
0 votes
1 answer

How to start Hadoop daemons?

Hi@MD, Before starting with the HDFS command, you have ...READ MORE

Oct 15, 2020 in Big Data Hadoop by akhtar
 • 38,230 points
edited Oct 16, 2020 by akhtar • 540 views
0 votes
1 answer

Enable HA for ranger KMS.

Hi, If you have installed Ranger through Ambari ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
 • 95,440 points • 452 views
0 votes
1 answer

HA ranger KMS ,

Hi@Shilpa, If you have installed Ranger through Ambari ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
 • 95,440 points • 458 views
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