Trending questions in Big Data Hadoop

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What is the difference between Apache ZooKeeper and Apache Oozie?

The main difference between these two is ...READ MORE

Nov 21, 2018 in Big Data Hadoop by Anoop
3,948 views
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Not able to insert in hive partition table

You have to add the partition before ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
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2,915 views
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What is the Path of hdfs.site.xml?

Here's where you can find the file: /etc/hadoop/[service ...READ MORE

Jan 4, 2019 in Big Data Hadoop by Omkar
• 69,210 points
1,991 views
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1 answer

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
2,605 views
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How to check Cloudera Manager Service status?

There surely is a command to check ...READ MORE

Dec 17, 2018 in Big Data Hadoop by Omkar
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2,732 views
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Does Hadoop merge the output files after reduce phase?

No, the files after the reduce phase are ...READ MORE

Jan 23, 2019 in Big Data Hadoop by Omkar
• 69,210 points
1,211 views
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Hadoop Job Tracker problem. I cannot connect to http://localhost:50030/

I think you are using new version ...READ MORE

Nov 30, 2018 in Big Data Hadoop by Omkar
• 69,210 points
3,501 views
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1 answer

Not able to install yarn on Ubuntu

Seems like your system does not have ...READ MORE

Feb 5, 2019 in Big Data Hadoop by Omkar
• 69,210 points
604 views
0 votes
1 answer

Not able to list tables in sqoop

The default port number for MySQL is ...READ MORE

Jan 29, 2019 in Big Data Hadoop by Omkar
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881 views
–1 vote
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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
• 69,210 points
2,639 views
–1 vote
1 answer

Hadoop error: can not start-all.sh

Try adding <property> <name>dfs.name.dir</name> <value>/path/to/hdfs/dir</value> ...READ MORE

Jan 12, 2019 in Big Data Hadoop by Omkar
• 69,210 points
1,624 views
0 votes
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Not able to start namenode with ./start-all.sh

Try this: stop all the daemons: ./stop-all.sh format the namenode: cd ...READ MORE

Jan 3, 2019 in Big Data Hadoop by Omkar
• 69,210 points
1,934 views
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Why scala generates 2 files, Person.class and Person$.class?

While running Scala, Scala objects are translated ...READ MORE

Feb 7, 2019 in Big Data Hadoop by Omkar
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414 views
–1 vote
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Namenode not running

Never mind. I forgot to run hadoop namenode ...READ MORE

Dec 27, 2018 in Big Data Hadoop by digger
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2,240 views
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expected org.apache.hadoop.io.IntWritable, received org.apache.hadoop.io.LongWritable

Hey George!  This error comes whenever you use ...READ MORE

Jan 25, 2019 in Big Data Hadoop by Omkar
• 69,210 points
927 views
0 votes
1 answer

How to control logging functionality in Hadoop?

 Logs are distributed across your cluster, but ...READ MORE

Nov 12, 2018 in Big Data Hadoop by Frankie
• 9,830 points
4,125 views
0 votes
1 answer

How to set input split settings?

It can be controlled by setting the ...READ MORE

Dec 27, 2018 in Big Data Hadoop by Omkar
• 69,210 points
2,143 views
0 votes
1 answer

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
2,527 views
0 votes
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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
2,703 views
0 votes
1 answer

What does a secondary namenode do in Hadoop?

The Secondary namenode is mainly used as a ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
• 69,210 points
2,370 views
0 votes
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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
• 9,830 points
2,671 views
0 votes
1 answer

How to retrieve the list of sql (Hive QL) commands that has been executed in a hadoop cluster?

Well, what you can do is use ...READ MORE

Apr 4, 2018 in Big Data Hadoop by kurt_cobain
• 9,390 points
13,602 views
0 votes
1 answer

Can't access hadoop job logs

The error which you are getting can ...READ MORE

Jan 28, 2019 in Big Data Hadoop by Omkar
• 69,210 points
676 views
0 votes
1 answer

Hadoop HDFS: Java API to move files to hdfs

You can use the FileUtil api to do this. Example: Configuration ...READ MORE

Nov 19, 2018 in Big Data Hadoop by Omkar
• 69,210 points
3,696 views
0 votes
0 answers
0 votes
1 answer

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
• 69,210 points
2,590 views
–1 vote
1 answer

Hadoop MapReduce word count program failed

Seems like Firewall is blocking the connection. ...READ MORE

Jan 21, 2019 in Big Data Hadoop by Omkar
• 69,210 points
962 views
0 votes
1 answer

Creating a Parquet or Avro file

In hadoop, we do not create different ...READ MORE

Jan 22, 2019 in Big Data Hadoop by Omkar
• 69,210 points
895 views
0 votes
1 answer

Hadoop tools/eco-system version compatibility doubt

Below are the versions which can be used ...READ MORE

Jan 31, 2019 in Big Data Hadoop by Omkar
• 69,210 points
462 views
–1 vote
1 answer

Hadoop daemons not starting

You have to write this directory in ...READ MORE

Jan 11, 2019 in Big Data Hadoop by Omkar
• 69,210 points
1,359 views
0 votes
1 answer

Junit test for Map Reduce Hadoop

Hi. This is the code I used ...READ MORE

Dec 17, 2018 in Big Data Hadoop by Omkar
• 69,210 points
2,400 views
0 votes
1 answer

How to run Nutch in Hadoop installed in pseudo-distributed mode

Make sure you have built Nutch from ...READ MORE

Jan 24, 2019 in Big Data Hadoop by Frankie
• 9,830 points
757 views
0 votes
1 answer

Cant access file from Hive. permission denied

There are two possible reasons for this: Wrong ...READ MORE

Dec 31, 2018 in Big Data Hadoop by Omkar
• 69,210 points
1,768 views
0 votes
1 answer

Update hdfs data before stroring in MySql

Yes, you can update the data before ...READ MORE

Jan 27, 2019 in Big Data Hadoop by Omkar
• 69,210 points
554 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
• 69,210 points
1,908 views
0 votes
1 answer

Class not found exception when I am running my Word Count Program jar file

You have forgotten to include the package name ...READ MORE

Jan 18, 2019 in Big Data Hadoop by Omkar
• 69,210 points
908 views
0 votes
1 answer

Error while starting hadoop daemons

First, format the namenode and then try ...READ MORE

Jan 11, 2019 in Big Data Hadoop by Omkar
• 69,210 points
1,205 views
0 votes
1 answer

Hue Health issue

The status of Hue is shown in ...READ MORE

Jan 31, 2019 in Big Data Hadoop by Omkar
• 69,210 points
292 views
0 votes
1 answer

Hadoop installation issue on fedora 24

type jps and check whether namenode and datanode is ...READ MORE

Jan 24, 2019 in Big Data Hadoop by Frankie
• 9,830 points
580 views
–1 vote
1 answer

Sqoop split-by problem

Hello. The -m or --num-mappers is just a ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
• 69,210 points
2,159 views
0 votes
1 answer

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
• 69,210 points
2,717 views
0 votes
1 answer

What are the different types of tombstone markers in HBase for deletion?

1)Family Delete Marker- This markers marks all ...READ MORE

Dec 17, 2018 in Big Data Hadoop by Frankie
• 9,830 points
2,175 views
0 votes
1 answer

What is the command to count number of lines in a file in hdfs?

hadoop fs -cat /example2/doc1 | wc -l READ MORE

Nov 22, 2018 in Big Data Hadoop by Omkar
• 69,210 points
3,243 views
0 votes
1 answer

Why is using Combiner function not preferred in shuffling?

Combiner function is not preferred because when ...READ MORE

Jan 23, 2019 in Big Data Hadoop by Omkar
• 69,210 points
581 views
0 votes
1 answer

Hadoop: namenode -format error "java.io.IOException"

Run the command as sudo or add the ...READ MORE

Nov 26, 2018 in Big Data Hadoop by Omkar
• 69,210 points
3,039 views
0 votes
1 answer

How to open MySql console in Ubuntu?

sudo service mysqld restart mysql -u <username> root ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
• 69,210 points
2,262 views
0 votes
1 answer

Hbase installation Issue. Cant start HRegionServer and HQuorumPeer

It seems hbase did not start properly ...READ MORE

Dec 26, 2018 in Big Data Hadoop by Omkar
• 69,210 points
1,731 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
• 69,210 points
1,460 views
–1 vote
1 answer

IDE Eclipse: Failed to locate the winutils binary in the hadoop binary path

Try this: First, click on file import appliance. Now ...READ MORE

Dec 31, 2018 in Big Data Hadoop by Omkar
• 69,210 points
1,540 views