Recent questions tagged big-data

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Does map/reduce merge output files after reduce phase?

Sep 25, 2018 in Big Data Hadoop by slayer
 • 29,370 points • 862 views
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How to pass large records to map/reduce tasks?

Sep 25, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,470 views
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What is Dumbo MapReduce in Hadoop?

Sep 23, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,065 views
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What is Modeling data in Hadoop and how to do it?

Sep 19, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,814 views
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What is Custom partitioner in Hadoop? How to write partition function ?

Sep 18, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,597 views
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What is the difference between Hadoop MapReduce and built-in MapReduce?

Sep 11, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,637 views
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How to format the output being written by MapReduce in Hadoop?

Sep 5, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 2,639 views
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What is the best functional language to do Hadoop Map-Reduce?

Sep 4, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 925 views
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What are the options for hadoop on scala?

Aug 22, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 652 views
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What are the problems in creating volume in mapr hadoop?

Aug 22, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,051 views
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How hadoop command works with javac?

Aug 17, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,672 views
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Want to have an idea on Hadoop Machine Learning and Data Mining project.

Aug 14, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,370 views
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Which is the most preferable language for Hadooop Map-Reduce programs?

Aug 4, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,803 views
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Passing keys and values to the reducers during a standard sort and shuffle phase of MapReduce

Jul 27, 2018 in Big Data Hadoop by Meci Matt
 • 9,460 points • 2,481 views
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1 answer

What makes Spark faster than MapReduce?

Jul 27, 2018 in Apache Spark by Neha
 • 6,300 points • 1,542 views
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2 answers

How do I integrate Kdb+ and hadoop?

Jul 12, 2018 in Big Data Hadoop by shubham
 • 7,340 points • 1,773 views
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How can I compare the elements of the RDD using MapReduce?

May 24, 2018 in Apache Spark by code799
 • 3,470 views
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Java MapReduce error saying No FileSystem for scheme:hdfs

May 9, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,767 views
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“no such file or directory" in case of hadoop fs -ls

May 9, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 8,293 views
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Does setup & clean methods in Hadoop MapReduce is executed after each task?

May 8, 2018 in Big Data Hadoop by king_of_code
 • 2,321 views
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Submitting MapReduce job using jobConf object vs job object

May 4, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,872 views
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1 answer

Which Data Structure is used in case of Map Reduce?

May 4, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,485 views
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1 answer

Setting the Number of Map tasks and Reduce Tasks not Working

May 4, 2018 in Big Data Hadoop by Atul
 • 10,240 points • 1,532 views
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1 answer

Hadoop giving java.io.IOException, in mkdir Java code.

May 3, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,583 views
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1 answer

Hadoop job getting executed in local mode only?

May 3, 2018 in Big Data Hadoop by Atul
 • 10,240 points • 2,475 views
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1 answer

Why is Spark faster than Hadoop Map Reduce

Apr 30, 2018 in Apache Spark by Data_Nerd
 • 2,390 points • 1,416 views
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1 answer

What is the function of getLocalCacheArchives method?

Apr 29, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 937 views
+1 vote
1 answer

Why is jar file required to execute a MR code instead of class file?

Apr 24, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,281 views
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1 answer

How to transfer data from Netezza to HDFS using Apache Sqoop?

Apr 23, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,781 views
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1 answer

Hadoop demo Code not working

Apr 20, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 904 views
0 votes
1 answer

How to work with distributed cache in Hadoop?

Apr 20, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,380 views
0 votes
1 answer

How to implement data locality in Hadoop MapReduce?

Apr 20, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,133 views
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1 answer

Declaring separator in the MapReduce(Hadoop 0.20)

Apr 20, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 629 views
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1 answer

Getting error in Custom Input Format

Apr 19, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 669 views
0 votes
1 answer

Error in Hadoop Mapreduce

Apr 19, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 1,196 views
0 votes
1 answer

Getting error in Hadoop: Output file already exist

Apr 19, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 8,579 views
0 votes
1 answer

Hadoop single node cluster set up issues

Apr 19, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 953 views
0 votes
1 answer

Map and Reduce task memory settings in Hadoop YARN

Apr 18, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 1,226 views
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1 answer

How to set the number of Map & Reduce tasks?

Apr 18, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,958 views
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1 answer

Getting error in Hadoop Streaming: Type mismatch in Key from Map

Apr 18, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,306 views
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1 answer

Replication Factor in Hadoop?

Apr 18, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 1,280 views
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1 answer

Is there any way to write "map only" Hadoop jobs ?

Apr 16, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 974 views
0 votes
1 answer

Moving files in Hadoop using the Java API?

Apr 15, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 2,703 views
0 votes
11 answers

What is the command to start Job history server in Hadoop 2.x & how to get its UI?

Apr 15, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 21,211 views
0 votes
1 answer

Hadoop query regarding setJarByClass method of Job class

Apr 15, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 2,407 views
0 votes
1 answer

Getting error in MapReduce job.setInputFormatClass

Apr 15, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 2,093 views
0 votes
1 answer

Is java necessary for Hadoop?

Apr 11, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 775 views
0 votes
1 answer

How do I parse pdf file using MapReduce?

Apr 11, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,695 views
0 votes
1 answer

What is the difference between a zero reducer and identity reducer in Hadoop Mapreduce?

Apr 10, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 2,609 views
0 votes
1 answer

How to use custom FileInputFormat in MapReduce?

Apr 10, 2018 in Big Data Hadoop by coldcode
 • 2,090 points • 1,267 views
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