Trending questions in Big Data Hadoop

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What is distributed Cache in MapReduce Framework ?

Distributed Cache is an important feature provided ...READ MORE

Dec 7, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,750 views
0 votes
0 answers

wordcount example not running on edureka vm

Hi, wordcount example failing on edureka vm(VM is ...READ MORE

Dec 25, 2018 in Big Data Hadoop by PRASAD
 • 120 points • 987 views
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2 answers

How to exit NameNode safe mode?

hadoop dfsadmin -safemode leave READ MORE

Apr 11, 2019 in Big Data Hadoop by anonymous
 • 4,041 views
–1 vote
1 answer

Can't seem to make hdfs commands to work

Check the ip address mentioned in core-site.xml ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,134 views
0 votes
1 answer

Not able to start jobtracker in hadoop

There is no jobtracker in hadoop 2.2.0 YARN framework. ...READ MORE

Dec 11, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,496 views
0 votes
1 answer

How to read Spark elements having multiple lines each?

Try this: val new_records = sc.newAPIHadoopRDD(hadoopConf,classOf[ ...READ MORE

Dec 12, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,450 views
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1 answer

Cant find slave on ResourceManager Web UI

Seems like it is running on default ...READ MORE

Dec 5, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,758 views
–1 vote
1 answer

Mapreduce in Python

mapper.py #!/usr/bin/python import sys #Word Count Example # input comes from ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,104 views
0 votes
1 answer

Mapreduce shuffle and sort

The mapreduce task happens in the following ...READ MORE

Dec 27, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 746 views
–1 vote
1 answer

Hadoop cluster is not running in vm

First check if all daemons are running: sudo ...READ MORE

Dec 26, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 805 views
0 votes
1 answer

How is a file written in hdfs?

When you copy a file from the ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 986 views
–1 vote
1 answer

Facing the below error while installing mysql in VM

We would like to say that the ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,006 views
0 votes
1 answer

Not able to install hadoop using maven

First make sure you have ant installed ...READ MORE

Dec 6, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,592 views
–1 vote
1 answer

File is available at HDFS location. Still system throws en error.

This is happening because the file name ...READ MORE

Jan 2, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 471 views
0 votes
1 answer

Apache Spark vs MapReduce

Both Spark and Hadoop MapReduce are used ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,031 views
0 votes
1 answer

All daemons starting except datanode

There could be more than one reason ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 939 views
0 votes
1 answer

How to fix corrupt HDFS FIles?

You can use hdfs fsck / to ...READ MORE

Oct 25, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,411 views
+2 votes
5 answers

Not able to start hadoop dfs

You can re-install openssh-client and openssh-server: $ sudo ...READ MORE

Oct 25, 2018 in Big Data Hadoop by Jino
 • 3,221 views
0 votes
1 answer

What is local file System?

LocalFS means it may be your LinuxFS ...READ MORE

Dec 11, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,367 views
0 votes
1 answer

Not able to list sqoop jobs

It seems like you are missing a ...READ MORE

Dec 13, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,230 views
0 votes
1 answer

Datanode not running and not able start

Please type the below command in the ...READ MORE

Dec 20, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 925 views
0 votes
1 answer

How to export file from sqoop to sql table?

For SQOOP export please try below command: bin/sqoop ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,178 views
0 votes
1 answer

Sqoop import not working

The error you are getting is because ...READ MORE

Dec 18, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 992 views
0 votes
1 answer

What is the meaning of Write Ahead Log in Hadoop?

Write Ahead Log (WAL) is a file ...READ MORE

Nov 21, 2018 in Big Data Hadoop by Sunil
 • 2,194 views
0 votes
1 answer

Which side join is taken by default by hive? Map-side or Reduce-side?

The syntax for Map-side join and Reduce-side ...READ MORE

Dec 13, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,203 views
0 votes
1 answer

Hadoop: Datanode not starting correctly

You can do the following method, copy to ...READ MORE

Nov 5, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,835 views
0 votes
1 answer

Hadoop Hive partitioning

Partitioning: Hive has been one of the preferred ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,163 views
0 votes
1 answer

Hadoop MapReduce wordcount "type job is not applicable for the arguments" error

The combiner class is not required in ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 862 views
0 votes
1 answer

How to connect impala to cloud lab?

impala-shell -i <domain_name>: <port > READ MORE

Dec 13, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,109 views
0 votes
1 answer

Command to partition table in Hive

Yes, You need to mention the below ...READ MORE

Dec 17, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 932 views
+2 votes
1 answer

How To Configure Tls Encryption For Cloudera Manager?

The Cloudera Connect Partner Program, more than ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 774 views
0 votes
1 answer

How to Upgrade Apache Hadoop from 2.4.1 to 2.6.0

If the downtime is not an issue, ...READ MORE

Nov 30, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,668 views
0 votes
1 answer

I want to install snappy on Hadoop 1.2.1. How do I do that?

As per Cloudera, if you install hadoop ...READ MORE

Dec 11, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,181 views
0 votes
1 answer

Hadoop Data node acknowledgement

Let's understand full write mechanism so that ...READ MORE

Dec 18, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 866 views
–1 vote
1 answer

Namenode start error

Seems like the content in core-site.xml file is ...READ MORE

Dec 26, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 538 views
–1 vote
1 answer

What is shared FS in the standby namenode?

Shared FS Basically implies to the high ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 794 views
0 votes
1 answer

What is the difference between Hadoop API and Streaming?

Usually we have Map/Reduce pair written in ...READ MORE

Dec 12, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,096 views
–1 vote
1 answer

Not able to access hadoop cluster

The issue which you are facing is ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 720 views
0 votes
1 answer

Hadoop mapreduce java: NullPoint Exception

Try this: String cords = it.next().toString(); lattitude = Double.toString((inst.decode(cords))[0]); longitude ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 977 views
0 votes
1 answer

How to create external Hive table?

It's simple. You just have to add external ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 969 views
+1 vote
1 answer

Do Cloudera’s Products Work With My Existing Data Management Infrastructure?

The Cloudera Connect Partner Program, more than ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 707 views
0 votes
1 answer

How to provide encryption for Cloudera HDFS?

You can provide security to cloudera hdfs by using HDFS ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 638 views
0 votes
1 answer

Getting some warning/error while loading java file using Hbase commands

In your code, you have set some ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 938 views
0 votes
1 answer

Which is helpful SVN or Git for Hadoop Development?

The official location for Hadoop is the ...READ MORE

Dec 7, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,265 views
0 votes
1 answer

How to use sqoop import?

Here is an example of import command. ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 916 views
0 votes
1 answer

How to write a file in hdfs with Java?

You could pass the URI when getting ...READ MORE

Sep 26, 2018 in Big Data Hadoop by digger
 • 26,740 points • 4,336 views
0 votes
1 answer

Error while connecting to Hive using Java JDBC

Use ​org.apache.hive.jdbc.HiveDriver as your driver ...READ MORE

Nov 22, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,903 views
0 votes
1 answer

Hadoop: Not able to start Namenode

Stop all running server 1) stop-all.sh Edit the ...READ MORE

Nov 8, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,477 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
 • 69,220 points • 2,253 views
0 votes
1 answer

What are the different relational operations in “Pig Latin” you worked with?

Different relational operators are: for each order by fil ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 903 views
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