Trending questions in Big Data Hadoop

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Where can I find AMI for Hadoop on EC2?

To find that, please try with below ...READ MORE

Nov 12, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,650 views
+1 vote
1 answer

What is the technique to know the Default scheduler in hadoop?

Default scheduler in hadoop is JobQueueTaskScheduler, which is ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,126 views
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1 answer

How should I provide a URL for hdfs file system?

If you are trying to access your ...READ MORE

Sep 10, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 4,319 views
0 votes
1 answer

Hadoop: No Such Method Exception

Mapper and reducer classes need to be ...READ MORE

Oct 26, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 2,288 views
0 votes
1 answer

Hadoop: method to send output to multiple directories

setup: MultipleOutputs.addNamedOutput(job, "Output", TextOutputFormat.class, Text.class, Text.class); setup of reducer: mout ...READ MORE

Nov 13, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,500 views
+2 votes
1 answer

Hadoop Jersey 1.x injection which is now not supported by Weblogic 12C

Add these lines to your weblogic-application.xml file ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,923 views
0 votes
1 answer

How to upgrade from Hadoop 1.2 to Hadoop 2.2?

Here's the solution that worked for me: <dependency> ...READ MORE

Nov 21, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,090 views
0 votes
1 answer

Does Hadoop and Spark support iPv6 now?

It does not. As of today HADOOP-11890, which ...READ MORE

Oct 15, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,661 views
0 votes
1 answer

Hadoop with Python: How to use python to stop Hadoop tasktracker?

Here you go os.system('sudo -u hadoop bin/hadoop-daemon.sh stop ...READ MORE

Nov 16, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,227 views
0 votes
1 answer

“no such file or directory" in case of hadoop fs -ls

The behaviour that you are seeing is ...READ MORE

May 9, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points
edited May 9, 2018 by nitinrawat895 • 9,438 views
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1 answer

Where can I find logs in Spark on YARN?

You can access logs through the command yarn ...READ MORE

Nov 8, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,518 views
0 votes
1 answer

Is Linux Skills mandatory to become Hadoop developer?

Hello. Knowing basics of Linux is mandatory ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,573 views
0 votes
1 answer

Hadoop MapReduce intermediate output

keep.task.files.pattern parameter can be used to keep the ...READ MORE

Nov 16, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,125 views
0 votes
1 answer

Can someone tell me how apache sqoop works?

This blog would give you answers to ...READ MORE

Nov 16, 2018 in Big Data Hadoop by brat_1
 • 7,200 points • 1,164 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 • 2,462 views
0 votes
1 answer

Hadoop: Reading and Writing Sequencefile using Apis?

public class SequenceFilesTest { @Test ...READ MORE

Nov 9, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,407 views
0 votes
1 answer

How to find Hadoop version in CDH?

The simplest way to check Hadoop version ...READ MORE

Apr 19, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 10,178 views
0 votes
1 answer

Moving data to hdfs using copyFromLocal command

Actually dfs.data.dir and dfs.name.dir have to point ...READ MORE

Mar 27, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 11,153 views
0 votes
1 answer

Permission denied at hdfs

You can spolve this by adding below ...READ MORE

Sep 27, 2018 in Big Data Hadoop by digger
 • 26,740 points • 3,169 views
+1 vote
1 answer

Hive: How to use insert query like SQL

It is now possible to insert like ...READ MORE

Nov 5, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,400 views
0 votes
1 answer

What is the use of sequence file in Hadoop?

Sequence files are binary files containing serialized ...READ MORE

Apr 6, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 10,670 views
0 votes
1 answer

What is the standard way to create files in your hdfs file-system?

Well, it's so easy. Just enter the below ...READ MORE

Sep 23, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,306 views
0 votes
1 answer

Getting error in Hadoop: Output file already exist

When you executed your code earlier, you ...READ MORE

Apr 19, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 10,030 views
0 votes
1 answer

How do I compile my java program on Ubuntu such that it will refer to hadoop-2.2.0 libraries?

The simplest solution for Linux machines would ...READ MORE

Oct 29, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,688 views
0 votes
1 answer

how is apache sqoop different from flume? Can someone explain?

Apache Sqoop lets you import and export ...READ MORE

Nov 15, 2018 in Big Data Hadoop by brat_1
 • 7,200 points • 916 views
0 votes
1 answer

can't find start-all.sh in hadoop installation

Actually, you are not mentioning the path for ...READ MORE

Apr 17, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 10,053 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 • 2,835 views
0 votes
1 answer

Is there a way to copy data from one one Hadoop distributed file system(HDFS) to another HDFS?

The distributed copy command, distcp, is a ...READ MORE

Mar 22, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 11,158 views
0 votes
1 answer

Hadoop: How to Group mongodb - mapReduce output?

db.order.mapReduce(function() { emit (this.customer,{count:1,orderDate:this.orderDate.interval_start}) }, function(key,values){ var category; ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,415 views
0 votes
1 answer

What does a Hadoop tester do?

Hadoop tester, like any other tester, has ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,152 views
0 votes
1 answer

POC for Hadoop in real time scenario

I'd like to point a few things. If ...READ MORE

Oct 11, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,195 views
0 votes
1 answer

Where is hadoop-test.jar in Hadoop2?

In Hadoop 1, testmapredsort is launched from AllTestDriver.java, which was ...READ MORE

Oct 24, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,655 views
0 votes
1 answer

What skills do I need to become Hadoop Admin?

You have heard it right. There is ...READ MORE

Nov 8, 2018 in Big Data Hadoop by anonymous
 • 972 views
0 votes
1 answer

How to run Map Reduce program using Ubuntu terminal?

 I used the following steps to execute it ...READ MORE

Aug 7, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 4,967 views
0 votes
1 answer

What is a data serialization system?

So when Hadoop was being written by ...READ MORE

Oct 17, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,810 views
0 votes
1 answer

Backup and Checkpoint Node

Checkpoint Node keeps track of the latest ...READ MORE

Jul 31, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 5,154 views
0 votes
1 answer

How to exit name node from safe mode?

In order to forcefully let the namenode ...READ MORE

Sep 26, 2018 in Big Data Hadoop by slayer
 • 29,370 points • 2,674 views
0 votes
1 answer

What is Hadoop Performance Tuning?

Is it consistent or one-off reading? Is ...READ MORE

Oct 24, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,441 views
0 votes
1 answer

out of Memory Error in Hadoop

You can assign more memory by editing ...READ MORE

Oct 1, 2018 in Big Data Hadoop by slayer
 • 29,370 points • 2,349 views
+1 vote
2 answers

Execute Pig Script from Grunt Shell

From your current directory run  pig -x local Then ...READ MORE

Oct 25, 2018 in Big Data Hadoop by Kunal
 • 7,449 views
0 votes
1 answer

How to format the output being written by MapReduce in Hadoop?

Here is a simple code demonstrate the ...READ MORE

Sep 5, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,421 views
0 votes
1 answer

Is MapR a substitute for MapReduce?

MapR is a commercial distribution of Apache ...READ MORE

Oct 10, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,864 views
+5 votes
2 answers

Hive to HDFS transfer

Hive does not store data. Hive is ...READ MORE

Sep 20, 2018 in Big Data Hadoop by SM
 • 4,767 views
0 votes
1 answer

How will you choose various file formats for storing and processing data using Apache Hadoop ?

The decision to choose a particular file ...READ MORE

Sep 27, 2018 in Big Data Hadoop by zombie
 • 3,790 points • 2,372 views
+1 vote
1 answer

Where to set hadoop.tmp.dir? core-site.xml or hdfs-site.xml?

hadoop.tmp.dir (A base for other temporary directories) is ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 10,307 views
0 votes
1 answer

GROUP and COGROUP in PIG

Both GROUP and COGROUP operators are identical ...READ MORE

Jul 25, 2018 in Big Data Hadoop by shams
 • 3,670 points • 5,116 views
0 votes
1 answer

Understanding Hadoop Master Node, Slave Node and Data Node.

The NameNode and the JobTracker are single ...READ MORE

Sep 6, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,247 views
0 votes
1 answer

What is the command to check the number of cores in Spark?

Go to your Spark Web UI & ...READ MORE

May 17, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 8,097 views
0 votes
1 answer

Integration of Hadoop with Mongo DB concept

MongoDB isn't built to work on top ...READ MORE

Sep 25, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,384 views
0 votes
1 answer

How to create smaller table from big table in HIVE?

You could probably best use Hive's built-in sampling ...READ MORE

Sep 24, 2018 in Big Data Hadoop by digger
 • 26,740 points • 2,406 views
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