Most viewed questions in Big Data Hadoop

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How to load multiple tables in Sqoop?

U can use " import-all-tables " option ...READ MORE

Feb 18, 2019 in Big Data Hadoop by Omkar
 • 69,230 points • 1,973 views
0 votes
1 answer

Hadoop: error: Cannot lock storage /app/hadoop/tmp/dfs/name. The directory is already locked.

Hi, Check your dfs.name.dir and dfs.data.dir path in hdfs-site.xml. Or ...READ MORE

Aug 5, 2019 in Big Data Hadoop by Gitika
 • 65,910 points • 1,967 views
0 votes
1 answer

How to check the name of the hadoop server?

Hi@akhtar, If you're running a pseudo-distributed setup, you ...READ MORE

Oct 13, 2020 in Big Data Hadoop by MD
 • 95,440 points • 1,965 views
–1 vote
1 answer

How to use multiple spark version?

You can use the  SPARK_MAJOR_VERSION for this. Suppose ...READ MORE

Dec 27, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,962 views
0 votes
1 answer

Getting error message on execution of sqoop command to list database

Please use the sqoop list database syntax ...READ MORE

May 23, 2019 in Big Data Hadoop by Rashmi
 • 1,951 views
0 votes
1 answer

How do I connect my Spark based HDInsight cluster to my blob storage?

Go through this blog: https://docs.microsoft.com/en-us/azure/hdinsight/hdinsight-hadoop-use-blob-storage#access-blobs I went through this ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,950 views
0 votes
1 answer

Configuring JDBC Clients for LDAP Authentication with HiveServer2

JDBC client requires a connection URL as ...READ MORE

Jun 3, 2019 in Big Data Hadoop by Raman
 • 1,948 views
+3 votes
5 answers

Hadoop DistributedCache is deprecated - what is the preferred API?

I had the same problem. And not ...READ MORE

Oct 12, 2018 in Big Data Hadoop by Rohan
 • 1,947 views
0 votes
1 answer

Hive Execution Engine

The default execution engine for Hive is mr. To ...READ MORE

Jun 4, 2019 in Big Data Hadoop by Varun
 • 1,943 views
0 votes
1 answer

Explain to me how to get Hadoop configuration in Java Util.

In order to get access to the File ...READ MORE

May 24, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 1,942 views
0 votes
1 answer

Sqoop error while importing data from MySql

As the error states, the target directory ...READ MORE

Feb 11, 2019 in Big Data Hadoop by Omkar
 • 69,230 points • 1,931 views
0 votes
1 answer

Can you please help with Hive Query to get FirstName, MiddleName, LastName and Suffix from FullName in Hive. Thank you

Hey, You can get first name, middle name, ...READ MORE

May 15, 2019 in Big Data Hadoop by Gitika
 • 65,910 points
edited May 15, 2019 by Gitika • 1,930 views
0 votes
1 answer

Enabling TLS/SSL on Hive

To enable TLS/SSL on hive, you have ...READ MORE

May 31, 2019 in Big Data Hadoop by Haran
 • 1,927 views
0 votes
3 answers

Can we run Spark without using Hadoop?

No, you can run spark without hadoop. ...READ MORE

May 7, 2019 in Big Data Hadoop by pradeep
 • 1,927 views
0 votes
1 answer

Iterate twice on values (MapReduce)

We have to cache the values from ...READ MORE

Oct 1, 2018 in Big Data Hadoop by digger
 • 26,740 points • 1,915 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 • 1,915 views
0 votes
1 answer

How to delete hdfs folder from java app?

Try this: Configuration conf = new Configuration(); ...READ MORE

Oct 30, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,914 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 • 1,914 views
0 votes
1 answer

Why CREATE EXTERNAL keyword is used in Hive?

Hey, The create external keyword is used to create a ...READ MORE

May 15, 2019 in Big Data Hadoop by Gitika
 • 65,910 points • 1,908 views
0 votes
1 answer

Command to listing all the tables In HBase?

Hey, list is the command that is used ...READ MORE

May 23, 2019 in Big Data Hadoop by Gitika
 • 65,910 points • 1,907 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 • 1,904 views
0 votes
1 answer

Path to hiverc file

The hiverc file is not created by default. ...READ MORE

Feb 14, 2019 in Big Data Hadoop by Jishan
 • 1,902 views
0 votes
1 answer

Difference between Text and String in Hadoop

The binary representation of a Text object ...READ MORE

Aug 8, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 1,901 views
+1 vote
1 answer

Unable to load data in Hbase table from dataset

Try these steps (make necessary changes): First upload ...READ MORE

Dec 18, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,901 views
0 votes
1 answer

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
 • 69,230 points • 1,900 views
+1 vote
1 answer

Hadoop: Using composite-key

You can use a Writable, something like ...READ MORE

Nov 12, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,900 views
–1 vote
1 answer

Getting error while starting hdfs namenode -format

Check your /etc/hosts file, the format should be like ...READ MORE

Jan 12, 2019 in Big Data Hadoop by Omkar
 • 69,230 points • 1,899 views
0 votes
2 answers

How to set up Map and Reduce Tasks?

Hi, The number of map tasks for a ...READ MORE

Aug 5, 2019 in Big Data Hadoop by Rashi
 • 1,895 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 • 1,886 views
0 votes
1 answer

which version of sqoop should i use for hadoop 3.3.0?

Hi@shresht, This is just a warning. Did you ...READ MORE

Sep 7, 2020 in Big Data Hadoop by MD
 • 95,440 points • 1,884 views
0 votes
1 answer

JDBC to HiveServer2 connection in HTTPS mode with SSL enabled

To connect to HiveServer2 in HTTPS mode ...READ MORE

Jun 4, 2019 in Big Data Hadoop by Firoz
 • 1,883 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
 • 69,230 points • 1,881 views
0 votes
1 answer

How to run Hadoop 2.1.0 in Windows System?

Same problem but with recent Hadoop v. ...READ MORE

Sep 11, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 1,879 views
0 votes
1 answer

Getting error in MapReduce job.setInputFormatClass

In old Hadoop API(i.e. below Hadoop 0.20.0), ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,877 views
0 votes
1 answer

What Distributed Cache is actually used for in Hadoop?

Basically distributed cache allows you to cache ...READ MORE

Apr 3, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 1,875 views
0 votes
1 answer

Hadoop Pig: java.lang.NoClassDefFoundError: org/apache/hadoop/hbase/filter/Filter

This seems like a problem with the ...READ MORE

Nov 16, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,870 views
0 votes
2 answers

E0901: Namenode [localhost:8020] not allowed, not in Oozies whitelist

You can add this below property in oozie-site.xml: <property> <name>oozie.service.HadoopAccessorService.jobTracker.whitelist</name> <value>myaddress:8020</value> </property> Hope ...READ MORE

Aug 6, 2019 in Big Data Hadoop by Shiva
 • 1,863 views
0 votes
1 answer

Explain to me the difference between HBase and HDFS.

Hadoop generally consists of three major components: HDFS It ...READ MORE

Apr 12, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 1,860 views
0 votes
1 answer

What happens in a MapReduce job when you set the number of reducers to one?

If you set number of reducers as ...READ MORE

Jul 31, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,855 views
0 votes
0 answers

ava.sql.SQLException: Error while processing statement:

Hi everyone, I am facing one issue ...READ MORE

Aug 7, 2019 in Big Data Hadoop by Hemanth
 • 250 points
edited Aug 7, 2019 by Omkar • 1,854 views
0 votes
1 answer

Load data into teradata using sqoop

The general syntax to do this as ...READ MORE

Jul 15, 2019 in Big Data Hadoop by Ritu
 • 1,853 views
0 votes
1 answer

How to run Hadoop in Docker containers?

Hi, You can run Hadoop in Docker container. Follow ...READ MORE

Jan 24, 2020 in Big Data Hadoop by MD
 • 95,440 points • 1,853 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 • 1,851 views
0 votes
2 answers

Not Able to read the file from hdfs location

Please make sure you connect to spark2-shell ...READ MORE

Jul 14, 2020 in Big Data Hadoop by Shantanu
 • 190 points • 1,847 views
0 votes
1 answer

What are the services running in Hadoop

Below are the services Running in Hadoop Hdfs  yarn mapreduce ozzie zookeeper hive hue hbase impala flume sqoop spark Depending ...READ MORE

Jun 24, 2019 in Big Data Hadoop by deepak
 • 1,847 views
0 votes
1 answer

How to run MapReduce program?

Eclipse is already installed in the Edureka ...READ MORE

Feb 22, 2019 in Big Data Hadoop by Suman
 • 1,847 views
0 votes
1 answer

Datanode not running on Hadoop-2.7.3

Hey, I solved this problem by removing hadoop ...READ MORE

Jun 14, 2019 in Big Data Hadoop by Gitika
 • 65,910 points • 1,845 views
0 votes
1 answer

Distcp From Local to HDFS giving error file not found

Hey, @Amey, This is probably because of a ...READ MORE

Apr 29, 2020 in Big Data Hadoop by Gitika
 • 65,910 points • 1,844 views
0 votes
1 answer

Query regarding String and Varchar in Hive

Varchar datatype is also saved internally as ...READ MORE

Feb 20, 2019 in Big Data Hadoop by Omkar
 • 69,230 points • 1,844 views
0 votes
1 answer

Unable to Locate WinUtils Library in Hadoop binary path.

If you are facing this problem while running a ...READ MORE

Jul 11, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 1,843 views
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