Most viewed questions in Big Data Hadoop

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How to use Hbase shell in a bash script?

Hello, To write scripts with HBase shell it includes non-interactive mode, ...READ MORE

May 29, 2019 in Big Data Hadoop by Gitika
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2,760 views
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How to see the report of Hadoop Cluster from command line?

Hi@akhtar, You can see the report of Hadoop Cluster ...READ MORE

Sep 25, 2020 in Big Data Hadoop by MD
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2,759 views
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Start-dfs.sh daemons not starting. localhost: mkdir: cannot create directory `/user': Permission denied

Make the following changes to the hadoop-env.sh ...READ MORE

Dec 6, 2018 in Big Data Hadoop by Omkar
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2,752 views
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What metadata is stored on a DataNode when a block is written to it?

Let me explain you step by step.  Each ...READ MORE

Jul 23, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
2,751 views
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Using HBase jar files. Where to download and set classpath

There are many sites you can get ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
• 69,210 points
2,737 views
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Installing Oozie on Linux System

Download Oozie from this link: http://www.apache.org/dyn/closer.lua/oozie/ Extract the files. ...READ MORE

Feb 28, 2019 in Big Data Hadoop by Rajan
2,728 views
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Sqoop could not load db driver class

Hello, Have you tried to put the both ...READ MORE

Dec 13, 2019 in Big Data Hadoop by Alexandru
• 510 points
2,724 views
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Sqoop: Dsqoop.export.records.per.statement option

Dsqoop.export.records.per.statement=1 is as the name suggests how many ...READ MORE

Jul 15, 2019 in Big Data Hadoop by Krish
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How to Rerunning a Coordinator Action or Multiple Actions in Oozie?

Hey, The rerun option reruns a terminated (=TIMEDOUT=, SUCCEEDED, KILLED, ...READ MORE

Jun 24, 2019 in Big Data Hadoop by Gitika
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2,722 views
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What are active and passive “NameNodes” in Hadoop?

In HA (High Availability) architecture, we have ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Frankie
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2,707 views
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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
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edited Mar 22, 2018 by nitinrawat895 2,682 views
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Display contents of my Parquet file.

Make sure you are running from the ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
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2,681 views
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How to restart failed Namenode?

You need to solve the issue which ...READ MORE

Jul 23, 2019 in Big Data Hadoop by Ishan
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How to merge two consecutive regions using command line in HBase?

Hey, The Master and RegionServer both participate in ...READ MORE

May 29, 2019 in Big Data Hadoop by Gitika
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2,672 views
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What is ETL tool in Hadoop?

Hi@akhtar, ETL means extract, transform, load. It is ...READ MORE

Feb 2, 2020 in Big Data Hadoop by MD
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2,671 views
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How to practice programming with Hadoop?

Well there are multiple ways to solve ...READ MORE

Mar 30, 2018 in Big Data Hadoop by kurt_cobain
• 9,390 points
2,667 views
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Error mapreduce.Job: Task Id : attempt_1475517800829_0009_m_000000_0, Status : FAILED Error: Java heap space

Hi@Hasid, To avoid this error, you have to ...READ MORE

Apr 17, 2020 in Big Data Hadoop by MD
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2,660 views
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What is the significance of ‘IF EXISTS” clause while dropping a table in Hive?

Hi, Since the table being dropped does not ...READ MORE

Jun 26, 2019 in Big Data Hadoop by Gitika
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2,658 views
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How will you decide whether you need to use the Capacity Scheduler or the Fair Scheduler?

Fair Scheduling is the process in which ...READ MORE

Dec 20, 2018 in Big Data Hadoop by Frankie
• 9,830 points
2,656 views
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Not able to insert data into hive table

Seems like a hive version problem.​ insert operation is ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
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2,655 views
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Write data into hive table in a parquet

Below is an example query which you ...READ MORE

Jul 26, 2019 in Big Data Hadoop by Sadu
2,650 views
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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
• 69,210 points
2,646 views
0 votes
1 answer

Joining Multiple Spark Dataframes

You can run the below code to ...READ MORE

Mar 26, 2018 in Big Data Hadoop by Bharani
• 4,660 points
2,645 views
0 votes
1 answer

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
2,644 views
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1 answer

Command to see the status of MapReduce job?

Hi, You can use this command given below: Syntax: $ ...READ MORE

Jun 14, 2019 in Big Data Hadoop by Gitika
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2,637 views
0 votes
1 answer

What was Hadoop named after?

The creator of Hadoop, Doug Cutting named ...READ MORE

Dec 10, 2021 in Big Data Hadoop by CoderGirl
• 500 points
2,636 views
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0 answers
0 votes
1 answer

HDFS on docker containers - is it possible?

Hi @judy, It is possible to Simplifying Hadoop deployments ...READ MORE

Feb 12, 2020 in Big Data Hadoop by Gitika
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2,631 views
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How to write a file in HDFS using Java Programming language?

Define the HADOOP_CONF_DIR environment variable to your Hadoop configuration ...READ MORE

Sep 28, 2018 in Big Data Hadoop by Frankie
• 9,830 points
2,631 views
–1 vote
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Unable to execute the jar file wordcount.

I see that the command that you ...READ MORE

Jan 21, 2019 in Big Data Hadoop by Omkar
• 69,210 points
2,614 views
–1 vote
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Error while creating Hive Database table

In your error, it says that the ...READ MORE

Jan 8, 2019 in Big Data Hadoop by Omkar
• 69,210 points
2,611 views
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1 answer

How to install RHadoop packages (RMR, RHDFS, RHBase)?

With dev tools you can install directly ...READ MORE

Jul 5, 2019 in Big Data Hadoop by ravikiran
• 4,620 points
2,610 views
0 votes
1 answer

What is Shared Edit Logs in case of Stand By Name Node in Hadoop 2.x?

Yes, Shared Edit Logs exist in case ...READ MORE

Jun 19, 2019 in Big Data Hadoop by Hansini
2,605 views
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What is fork Keyword in Oozie? How Fork and Join keyword are related t o each other in Oozie?

Hey, Basically, when we want to run multiple jobs ...READ MORE

Jun 12, 2019 in Big Data Hadoop by Gitika
• 65,910 points
2,605 views
0 votes
1 answer

What is the use of ZooKeeper in Hbase?

Hey, The zookeeper is used to maintain the ...READ MORE

May 21, 2019 in Big Data Hadoop by Gitika
• 65,910 points
2,601 views
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1 answer

How do you start and stop region server in HBase?

Hey, You can run multiple region servers from ...READ MORE

May 23, 2019 in Big Data Hadoop by Gitika
• 65,910 points
2,599 views
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Can DataNode and NameNode be commodity hardware?

DataNodes are the commodity hardware only as ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Neha
• 6,300 points
2,593 views
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how to store images and videos on to HDFS?

HDFS is capable to accept data in ...READ MORE

Jul 16, 2019 in Big Data Hadoop by ravikiran
• 4,620 points
2,588 views
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1 answer

ERROR tool.BaseSqoopTool: Got error creating database manager: java.io.IOException: No manager for connect string

Hi@akhtar, I think your jdbc jars are not ...READ MORE

Apr 24, 2020 in Big Data Hadoop by MD
• 95,440 points
2,586 views
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1 answer

Hive: Dropping a not empty database

This behavior is because Hive by default ...READ MORE

May 20, 2019 in Big Data Hadoop by Rakshit
2,575 views
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1 answer

Can we use Apache Sqoop and Hive both together? What is the difference between the two?

Yes, you can. In fact many people ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
2,558 views
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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
2,552 views
0 votes
1 answer

What was Hadoop written in?

The Hadoop framework is mostly written in ...READ MORE

Dec 9, 2021 in Big Data Hadoop by Kavya
• 700 points
2,549 views
0 votes
1 answer

How do I create a subquery in hive?

Hey, Hive subquery is a select expression enclosed ...READ MORE

May 17, 2019 in Big Data Hadoop by Gitika
• 65,910 points
2,545 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
2,541 views
0 votes
1 answer

Difference b/w reduce and reduceLeft

The reduceLeft method takes an associative binary ...READ MORE

Jun 20, 2019 in Big Data Hadoop by Kriti
2,539 views
0 votes
1 answer

Copy a table in HBase

Directly its not possible as in case ...READ MORE

Feb 14, 2019 in Big Data Hadoop by Loki
2,534 views
0 votes
1 answer

How to change block size in Hadoop dynamically?

Hi@akhtar, By default, the block size is 64MB ...READ MORE

Sep 25, 2020 in Big Data Hadoop by akhtar
• 38,230 points
2,523 views