Trending questions in Big Data Hadoop

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How to use Sqoop in Java Program?

You can run sqoop from inside your ...READ MORE

Nov 19, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 2,789 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 • 1,706 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
 • 69,180 points • 1,411 views
0 votes
1 answer

Running into an issue while running the mapred job on the server

Try this command hadoop dfs -put /var/tmp/students.txt / hadoop ...READ MORE

Dec 20, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,399 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
 • 69,180 points • 4,216 views
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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 • 3,650 views
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1 answer

Is Data locality concept applicable for Reducers also?

No, Data-Locality concept applies to MAPPERS only. Reducers ...READ MORE

Nov 30, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,249 views
–1 vote
1 answer

Is standby node missing in Hadoop 1.0?

Yes, Hadoop 1.0 didn't have standby namenode. ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,405 views
–1 vote
1 answer

Hadoop unit not found error

Unfortunately the command that you are giving ...READ MORE

Dec 21, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,335 views
0 votes
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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 • 1,721 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
 • 69,180 points • 1,379 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
 • 69,180 points • 2,852 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
 • 69,180 points • 1,891 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 • 2,433 views
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1 answer

Hadoop Hive Bucketing

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

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 1,507 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
 • 69,180 points • 1,288 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
 • 69,180 points • 5,911 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 • 8,195 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 • 5,757 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
 • 69,180 points • 1,428 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
 • 69,180 points • 3,333 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 • 5,668 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
 • 69,180 points • 2,712 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 • 1,665 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 • 1,745 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
 • 69,180 points • 2,913 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 • 3,278 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
 • 69,180 points • 2,192 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 • 6,936 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
 • 69,180 points • 2,246 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 • 1,869 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 • 11,455 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
 • 69,180 points • 2,197 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 • 1,838 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
 • 2,091 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
 • 69,180 points • 2,389 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 • 2,841 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 • 1,319 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
 • 69,180 points • 3,803 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 • 1,935 views
0 votes
1 answer

Hadoop fs mkdir and testing existence FileSystem.exists

FileSystem.get(conf) may return the local file system where ...READ MORE

Sep 18, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 4,726 views
0 votes
1 answer

How to write a file in HDFS using Java Programming language?

Define the HADOOP_CONF_DIR environment variable to your Hadoop configuration ...READ MORE

Sep 28, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 4,293 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 • 7,012 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
 • 69,180 points • 2,774 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
 • 69,180 points • 1,961 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
 • 69,180 points • 2,129 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
 • 69,180 points • 1,928 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 • 2,767 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 • 10,303 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
 • 69,180 points • 2,111 views
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