Trending questions in Big Data Hadoop

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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 • 921 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
 • 69,210 points • 1,575 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
 • 69,210 points • 584 views
0 votes
1 answer

How to implement sqoop jobs?

Step 1: Give the below command to ...READ MORE

Dec 18, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 399 views
0 votes
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 • 1,180 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
 • 69,210 points • 373 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
 • 2,530 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
 • 69,210 points • 2,101 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
 • 69,210 points • 1,880 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
 • 69,210 points • 340 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
 • 69,210 points • 1,796 views
0 votes
1 answer

Can not list/access files of local system from hadoop

You can not directory use files from ...READ MORE

Dec 13, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 570 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 • 3,897 views
0 votes
1 answer

How to configure Hosts file for Hadoop Eco-System?

For UBUNTU Hosts File and other configuration for Hadoop ...READ MORE

Sep 25, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,927 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
 • 69,210 points • 490 views
0 votes
1 answer

Hadoop Spark: What is version to find SparkSession in library Spark?

you need both core and SQL artifacts <repositories> ...READ MORE

Nov 13, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 1,770 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 • 815 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
 • 69,210 points • 457 views
0 votes
1 answer

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 • 1,494 views
0 votes
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 • 541 views
0 votes
3 answers

How to specify KeyValueTextInputFormat Separator in Hadoop-.20 api?

conf.set("key.value.separator.in.input.line", ","); Job job = new ...READ MORE

Dec 5, 2018 in Big Data Hadoop by Rio
 • 1,582 views
0 votes
1 answer

What does AM in “AM Container” mean in Hadoop

Here's another link from Hadoop which may ...READ MORE

Nov 2, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,163 views
0 votes
1 answer

In Hadoop what does dfs replicate mean?

The total number of files in the ...READ MORE

Sep 25, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,720 views
0 votes
1 answer

Hadoop: How to keep duplicates in Hive using collect_set()?

SELECT hash_id, COLLECT_LIST(num_of_cats) AS ...READ MORE

Nov 2, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 2,066 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 • 532 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 • 984 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
 • 3,195 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
 • 69,210 points • 551 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
 • 69,210 points • 1,506 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 • 591 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
 • 69,210 points • 1,672 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 • 2,141 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 • 1,069 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 • 380 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
 • 69,210 points • 971 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
 • 69,210 points • 1,898 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
 • 69,210 points • 1,571 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
 • 925 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
 • 69,210 points • 2,438 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
 • 69,210 points • 932 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
 • 69,210 points • 891 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 • 544 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 • 4,103 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 • 1,575 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 • 1,643 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
 • 69,210 points • 755 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 • 667 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
 • 69,210 points • 708 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
 • 69,210 points • 998 views
0 votes
1 answer

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 • 5,214 views
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