Most viewed questions in Big Data Hadoop

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1 answer

How to Install Cloudera Manager into my Virtual Machine ?

Before you start anything, First make sure ...READ MORE

Aug 9, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 2,156 views
0 votes
3 answers

How to specify KeyValueTextInputFormat Separator in Hadoop-.20 api?

conf.set("key.value.separator.in.input.line", ","); Job job = new ...READ MORE

Dec 5, 2018 in Big Data Hadoop by Rio
 • 2,155 views
0 votes
1 answer

Hive JDBC driver URL format and driver class.

For Hive server 1, the URL format ...READ MORE

May 31, 2019 in Big Data Hadoop by Adi
 • 2,152 views
0 votes
1 answer

Not able to start/stop hadoop daemons

If you were able to start the ...READ MORE

Dec 20, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,142 views
0 votes
1 answer

How compression works in Hadoop?

It basically depends on the file type ...READ MORE

Jul 27, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,138 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
 • 69,220 points • 2,135 views
0 votes
1 answer

Access DFS through Java API

It is because, may be you are ...READ MORE

Mar 23, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,135 views
0 votes
1 answer

Hadoop: How to use Jps command with Sun JDK installed?

You can put JPS into your path ...READ MORE

Nov 9, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,130 views
0 votes
1 answer

How to set the number of Map & Reduce tasks?

The map tasks created for a job ...READ MORE

Apr 18, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 2,129 views
+1 vote
1 answer

What are all the Data quality checks we do in our real time Big Data projects.

You can use a checksum to compare ...READ MORE

Sep 4, 2019 in Big Data Hadoop by Tina
 • 2,125 views
0 votes
1 answer

Set Table Lock manager for Hive

To enable Table Lock manager, you have ...READ MORE

May 31, 2019 in Big Data Hadoop by Vinod
 • 2,122 views
–1 vote
1 answer

WARN util.NativeCodeLoader: Unable to load native-hadoop library

To remove this warning, you can use:  hdfs ...READ MORE

Jan 22, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 2,121 views
0 votes
1 answer

What are some of the famous visualization tools which can be integrated with Hadoop & Hive?

I have personally used two visualization tools ...READ MORE

May 1, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 2,115 views
0 votes
1 answer

What do we exactly mean by “Hadoop” – the definition of Hadoop?

The official definition of Apache Hadoop given ...READ MORE

Mar 16, 2018 in Big Data Hadoop by Shubham
 • 2,108 views
0 votes
1 answer

ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: ZooKeeper session expired

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

Mar 31, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,102 views
0 votes
1 answer

IDE for writing and running hadoop jobs?

You can use the Eclipse IDE. It's ...READ MORE

Apr 10, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 2,102 views
0 votes
1 answer

How to import Flat files in Hadoop using sqoop?

Sqoop is a tool which we use ...READ MORE

Apr 9, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 2,101 views
0 votes
1 answer

Hadoop Nodes for Multiple Disks

Datanodes can store blocks in multiple directories ...READ MORE

Jul 3, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 2,094 views
0 votes
1 answer

Hadoop Hive: How to drop a table?

You cannot drop column directly from a ...READ MORE

Nov 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,091 views
0 votes
1 answer

Difference between Hadoop Mapreduce in MongoDB versus MangoDB's built-in MapReduce

Let me line up the crucial differences ...READ MORE

Apr 24, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 2,089 views
0 votes
1 answer

error: Access denied for user 'sample'@'localhost'.

This kind of error occurs when we ...READ MORE

Apr 15, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 2,089 views
0 votes
1 answer

How to store datasets from Pig to HDFS?

Hi Guys, You can store the loaded data ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,088 views
0 votes
1 answer

How to import PIG data into HBase?

Follow the below steps to do it: # ...READ MORE

Feb 15, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 2,086 views
0 votes
1 answer

How to load data from flat files into different partitions of Hive table?

Hi, You can load data from flat files ...READ MORE

Jun 26, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 2,085 views
0 votes
1 answer

GUI for using Hadoop

Hue is open source and works well ...READ MORE

Apr 24, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 2,075 views
0 votes
1 answer

Hive: Display logs on console

You can emit the logs on the ...READ MORE

May 21, 2019 in Big Data Hadoop by Jishnu
 • 2,073 views
–1 vote
1 answer

Pig code in Eclipse shows error :LongWritable cannot be resolved to a type

To rectify this errors, you need to ...READ MORE

Jan 2, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 2,071 views
0 votes
1 answer

Why we are configuring mapred.job.tracker in YARN?

I really dont know the reason behind ...READ MORE

Mar 29, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 2,064 views
0 votes
1 answer

How to change the default replication factor in Hadoop?

Hi@akhtar, You can change the default replication factor from the ...READ MORE

Oct 3, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,060 views
0 votes
1 answer

java.lang.NoSuchMethodError: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView

Hi@akhtar, I think there is a problem in ...READ MORE

Apr 30, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,060 views
0 votes
1 answer

Importing a portion of Relational Database to HDFS

Yes, there is a tool called Sqoop ...READ MORE

Jul 20, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,059 views
0 votes
1 answer

Multiple Output format in Hadoop

Each reducer uses an OutputFormat to write ...READ MORE

Jul 26, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 2,056 views
0 votes
1 answer

How to access HBase shell and navigate and navigate to the HBase home folder?

Hey, To access the HBase shell, you have ...READ MORE

May 23, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 2,052 views
0 votes
1 answer

How to configure secondary namenode in Hadoop 2.x ?

bin/hadoop-daemon.sh start [namenode | secondarynamenode | datanode ...READ MORE

Apr 6, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 2,052 views
0 votes
1 answer

How do I print hadoop properties in command line?

You can use the following command to get ...READ MORE

Apr 6, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 2,050 views
0 votes
1 answer

What is Streaming data and Hadoop?

The hack you describe is more or ...READ MORE

Nov 2, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,046 views
0 votes
1 answer

Hadoop: ERROR datanode.DataNode: All directories in dfs.data.dir are invalid.

Hi, Try this, first delete all contents from ...READ MORE

Aug 5, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 2,040 views
0 votes
1 answer

Killing oozie Jobs by userid

Suppose you want to kill the jobs ...READ MORE

Jul 29, 2019 in Big Data Hadoop by Esha
 • 2,036 views
0 votes
1 answer

Ranger kms create key failed

Hi@shllpa, I have checked your file. All seems ...READ MORE

Oct 6, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,030 views
0 votes
1 answer

Setting up Hadoop Multi-node cluster on windows 10 systems

Hi@Hassan, You can do it windows system as ...READ MORE

Oct 1, 2020 in Big Data Hadoop by MD
 • 95,460 points • 2,025 views
0 votes
1 answer

Hadoop: Error: Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected

Hey, The error seems you have not add ...READ MORE

Aug 7, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 2,021 views
+1 vote
2 answers

Hadoop: Error: Exception in thread “main” java.lang.UnsupportedClassVersionError: a

The reason for this error is because ...READ MORE

Aug 6, 2019 in Big Data Hadoop by Venkita
 • 240 points • 2,013 views
0 votes
1 answer

How to install Hadoop in Ubuntu?

Hey. Follow these steps to install hadoop. First ...READ MORE

Feb 19, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 2,013 views
+1 vote
0 answers

Class not found exception in wordcount program in mapreduce

import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import java.io.IOException; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import org.apache.hadoop.mapreduce.*; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import ...READ MORE

Oct 3, 2019 in Big Data Hadoop by Tarun
 • 160 points
edited Oct 3, 2019 by Omkar • 2,011 views
0 votes
1 answer

How to Sqoop in a Java Program?

You can use the following sample code for ...READ MORE

Jul 22, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 2,008 views
0 votes
1 answer

Different ports in a Hadoop cluster environment?

Below image will help you in understanding ...READ MORE

Apr 6, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,008 views
0 votes
1 answer

How to tune Spark jobs & optimize the performance?

You need to know the cluster properly ...READ MORE

Apr 18, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 2,007 views
0 votes
1 answer

How to configure Yarn from command line?

It's a bit non-intuitive, but it turns ...READ MORE

Oct 16, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,002 views
+1 vote
1 answer

Cassandra and Hadoop - realtime vs batch

Apache Hadoop, is a big data analytics ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,002 views
+1 vote
1 answer

2 datanodes is slower ,how to get those details .what is your approach as hadoop admin

First, enable the detection of slow nodes. ...READ MORE

Sep 23, 2019 in Big Data Hadoop by Riya
 • 1,998 views
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