Trending questions in Big Data Hadoop

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I get an error stating- Hadoop: «ERROR : JAVA_HOME is not set». How to resolve this?

Make sure that you have removed the ...READ MORE

Aug 7, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 6,433 views
0 votes
1 answer

How to move Word and PDF documents to Hadoop HDFS?

Try with below commands: hadoop fs -copyFromLocal <localsrc> ...READ MORE

Dec 5, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,238 views
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0 answers

Number of tasks submitted and executed within the day in hadoop

Tasks Write a software application, service, daemon or ...READ MORE

Dec 12, 2018 in Big Data Hadoop by Irfan
 • 120 points • 1,000 views
+1 vote
1 answer

How to switch off Cloudera Manager Service?

First list the running services: chkconfig --list And then ...READ MORE

Dec 17, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 634 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
2 answers

How to convert .txt file to Hadoop's sequence file format

import java.io.IOException; import java.net.URI; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IOUtils; import ...READ MORE

Oct 12, 2018 in Big Data Hadoop by Sanjay
 • 3,754 views
–1 vote
1 answer

Need help in Installation of Hadoop

To set up Hadoop VM in centOS ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 558 views
0 votes
1 answer

How to use jar file without putting it in hdfs?

If by "using", you mean distributing it, ...READ MORE

Dec 6, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,100 views
0 votes
1 answer

Understanding LongWritable

Hadoop needs to be able to serialise ...READ MORE

Oct 29, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,709 views
0 votes
1 answer

Hadoop Hive Bucketing

Partition helps in increasing the efficiency when ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 743 views
0 votes
1 answer

Hadoop PIG extraction shows no output

To see whether the extraction was done ...READ MORE

Dec 13, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 726 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 • 2,129 views
0 votes
1 answer

Why Hadoop is not implemented using MPI?

 One of the big features of Hadoop/map-reduce ...READ MORE

Dec 4, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 989 views
0 votes
1 answer

What is the usage of Configured class in Hadoop programs?

Configured is a default implementation of the Configurable interface - ...READ MORE

Nov 22, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,489 views
0 votes
1 answer

Not able to run mapreduce job. Attempt failes error

The most common reason for this is ...READ MORE

Nov 22, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,465 views
0 votes
1 answer

Hadoop Sqoop: How to change sqoop metastore?

In sqoop-site.xml I configured it with, the ...READ MORE

Nov 13, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,862 views
0 votes
1 answer

Do worker hosts need access to the Cloudera public repositories for an install with Cloudera Manager?

You can perform an installation or upgrade ...READ MORE

Dec 7, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 800 views
0 votes
0 answers

Is the Hadoop scalability linear or proportional to number of nodes?

Is it common to see this sentence: ...READ MORE

Nov 27, 2018 in Big Data Hadoop by Jins
 • 140 points • 1,210 views
+1 vote
1 answer

How to count number of rows in alias in PIG?

COUNT is part of pig LOGS= LOAD 'log'; LOGS_GROUP= ...READ MORE

Oct 15, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,970 views
0 votes
1 answer

Hadoop: What is the difference between `hadoop dfs` and `hadoop fs`?

You can find the definition here: $HADOOP_HOME/bin/hadoop ... elif [ ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,959 views
0 votes
1 answer

How to include third party library in Python MapReduce?

Problem has been solved by zipimport. Then I zip chardet to ...READ MORE

Nov 27, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,039 views
0 votes
1 answer

How to access Hadoop Data using REST service?

The REST API gateway for the Apache ...READ MORE

Sep 5, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 4,634 views
0 votes
1 answer

How to delete hdfs folder from java app?

Try this: Configuration conf = new Configuration(); ...READ MORE

Oct 30, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,243 views
0 votes
1 answer

Does Cloudera Manager Support an API?

Yes. A comprehensive set of APIs for ...READ MORE

Dec 7, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 553 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 • 2,045 views
0 votes
1 answer

Hadoop hdfs: How to count number of lines?

You can count the number of lines ...READ MORE

Nov 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,285 views
0 votes
1 answer

Hadoop: What does RDD mean?

RDD is the acronym for Resilient Distribution ...READ MORE

Nov 21, 2018 in Big Data Hadoop by Deepak
 • 1,214 views
0 votes
1 answer

Hadoop MacOS: formatting namenode: Could not find or load main class

You need to point the HADOOP_PREFIX to ...READ MORE

Nov 13, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,517 views
0 votes
1 answer

Which is the easiest way for text analytics with hadoop?

Apache pig provides CSVExcelStorage class for loading ...READ MORE

Nov 22, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,099 views
0 votes
1 answer

Hadoop Apache: Could not fully initialize service [org.apache.oozie.service.ShareLibService]

As mentioned in the error, the problem ...READ MORE

Nov 19, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,184 views
+3 votes
1 answer

Apache Nifi Execute Process Processor

Hey soujanyabargavi!  NO, ExecuteProcess does not allow incoming ...READ MORE

Sep 20, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 4,528 views
0 votes
1 answer

In Hadoop MapReduce, how can i set an Object as the Value for Map output?

Try this and see if it works: public ...READ MORE

Nov 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,084 views
0 votes
1 answer

Hadoop Pig: How to include external jar file in PIG?

You can do this: register /local/path/to/Jar_name.jar READ MORE

Nov 16, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,264 views
0 votes
1 answer

Job and Task Scheduling In Hadoop

I  n case of fair scheduler, when there is ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,945 views
0 votes
3 answers

Can we run Spark without using Hadoop?

No, you can run spark without hadoop. ...READ MORE

May 7, 2019 in Big Data Hadoop by pradeep
 • 2,559 views
0 votes
1 answer

Hadoop: Java code to get Hive table properties.

You can try this: org.apache.hadoop.hive.metastore.api.Table table=..........; org.apache.hadoop.hive.metastore.api.StorageDescriptor sd=table.getSd(); String loc=sd.getLocation(); String ...READ MORE

Nov 21, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,030 views
0 votes
1 answer

Best way of starting & stopping the Hadoop daemons with command line

First way is to use start-all.sh & ...READ MORE

Apr 15, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 10,491 views
0 votes
1 answer

Hadoop: RHadoop: packages ‘rmr’, ‘rJava‘, ‘RJSONIO‘, ‘rhdfs’, ‘rhbase’, ‘plyrmr’ are not available

You need to first download the packages ...READ MORE

Nov 14, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,283 views
0 votes
1 answer

Hadoop: `.' no such file or directory while installing

Try hadoop fs -mkdir -p /user/[Username] and then run ...READ MORE

Nov 2, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,744 views
0 votes
1 answer

What is Network Topology in Hadoop?

Let's imagine your cluster as a tree ...READ MORE

Sep 6, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 4,192 views
0 votes
2 answers

What is Shuffle Phase?

The process where the intermediate results from ...READ MORE

Mar 27, 2019 in Big Data Hadoop by Krishnan
 • 140 points • 1,893 views
0 votes
1 answer

Hadoop Oozie: E0902: Exception occured: [User: oozie is not allowed to impersonate oozie]

Seems like your version of Hadoop does ...READ MORE

Nov 12, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 1,234 views
0 votes
1 answer

What is the best way to integrate SAS with Hadoop without losing the parallel processing capacity of Hadoop

One of the major pushes at SAS ...READ MORE

Oct 16, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,400 views
0 votes
1 answer

How Namenode handles data node failures?

Let me explain you the whole scenario. NameNode ...READ MORE

Jul 11, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 6,568 views
0 votes
1 answer

Setting textinputformat.record.delimiter in spark

I got this working with plain uncompressed ...READ MORE

Oct 10, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 2,632 views
+2 votes
1 answer

How to calculate Maximum salary of the employee with the name using the Map Reduce Technique

Please try the below code and it ...READ MORE

Jul 25, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 5,862 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 • 1,700 views
0 votes
1 answer

What are the different ways of Installing Hadoop into our local machine?

Hadoop runs on Unix and on Windows. ...READ MORE

Aug 4, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 5,536 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
 • 69,220 points • 1,920 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
 • 69,220 points • 1,134 views
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