Recent questions tagged mapreduce

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What is MapReduce?

Dec 22, 2021 in Big Data Hadoop by CoderGirl
 • 500 points • 970 views
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What is the purpose of shuffling and sorting phase in the reducer in Map Reduce?

Dec 20, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 7,349 views
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How input splits are done when 2 blocks are spread across different nodes?

Dec 7, 2020 in Big Data Hadoop by Rajiv
 • 8,870 points • 1,361 views
+1 vote
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How does Hadoop process records split across block boundaries?

Dec 7, 2020 in Big Data Hadoop by Roshni
 • 10,480 points • 719 views
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Moving historyserver to another instance using curl command

Nov 9, 2020 in Big Data Hadoop by Shilpa S
 • 450 points • 799 views
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Map reduce history moving instance using curl .

Nov 7, 2020 in Big Data Hadoop by Shilpa S
 • 450 points • 797 views
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How to find the status of MapReduce Job?

Oct 16, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 829 views
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Enable HA for mapreduce jobhistory server

Sep 23, 2020 in Big Data Hadoop by Shilpa S
 • 450 points • 1,308 views
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How I can kill the jobs using jobID running in local mode with Hadoop

Aug 26, 2020 in Big Data Hadoop by kamboj
 • 140 points • 2,304 views
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Unable to get the Job status and Group ID java- spark standalone program with databricks

Jul 23, 2020 in Apache Spark by kamboj
 • 140 points • 2,282 views
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1 answer

Exception in createBlockOutputStream java.net.SocketTimeoutException: 69000 millis timeout while waiting for channel to be ready for connect.[connection-pending remote=/ xxx:50010]

Apr 30, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 2,743 views
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kernel: java: page allocation failure. order:4, mode:0x20

Apr 30, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 1,146 views
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1 answer

Error mapreduce.Job: Task Id : attempt_1475517800829_0009_m_000000_0, Status : FAILED Error: Java heap space

Apr 17, 2020 in Big Data Hadoop by Hasid
 • 370 points • 2,968 views
+2 votes
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MapReduce Job is failed: "Job failed as tasks failed. failed Maps:1 failed Reduces:0"

Jan 17, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 1,440 views
+1 vote
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Class not found exception in wordcount program in mapreduce

Oct 3, 2019 in Big Data Hadoop by Tarun
 • 160 points • 1,801 views
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How to call MapReduce program using a simple Java Program?

Sep 4, 2019 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,277 views
+1 vote
1 answer

sql exception when exporting

Sep 4, 2019 in Big Data Hadoop by Hemanth
 • 250 points • 2,691 views
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Exception in thread "main" java.lang.NoClassDefFoundError

Aug 9, 2019 in Big Data Hadoop by Reshma
 • 2,443 views
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Exception in thread "main" java.lang.UnsupportedClassVersionError: has been compiled by a more recent version of the Java Runtime

Aug 9, 2019 in Big Data Hadoop by Sushma
 • 1,422 views
+1 vote
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Job failed as tasks failed. failedMaps

Aug 1, 2019 in Big Data Hadoop by Hemanth
 • 250 points • 7,729 views
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1 answer

FAILEDError: java.io.IOException: Type mismatch in key from map

Jul 30, 2019 in Big Data Hadoop by Will
 • 1,828 views
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Explanation to outputcollector vs context

Jul 26, 2019 in Big Data Hadoop by Jai
 • 1,684 views
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1 answer

Classes implementing InputFormat frequently

Jul 24, 2019 in Big Data Hadoop by Piyush
 • 610 views
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Mapreduce: custom Input format

Jul 24, 2019 in Big Data Hadoop by Ritu
 • 1,039 views
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1 answer

Index LZO files

Jul 24, 2019 in Big Data Hadoop by Wasim
 • 815 views
0 votes
1 answer

Produce compressed data from map reduce

Jul 24, 2019 in Big Data Hadoop by sanjeev
 • 531 views
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1 answer

Running Mapreduce on compressed data

Jul 24, 2019 in Big Data Hadoop by Vidya
 • 848 views
0 votes
1 answer

How to Compress Map output?

Jul 24, 2019 in Big Data Hadoop by karan
 • 1,404 views
0 votes
1 answer

Input file name in the mapper in a Hadoop program

Jul 23, 2019 in Linux Administration by Upasana
 • 8,620 points • 3,248 views
0 votes
1 answer

Can we use different input and output format classes?

Jul 22, 2019 in Big Data Hadoop by Tilak
 • 658 views
0 votes
1 answer

Why do we use job.waitForCompletion(true) ?

Jul 22, 2019 in Big Data Hadoop by Raghu
 • 1,072 views
0 votes
1 answer

Mapreduce: What is the use of setting the name of the job?

Jul 22, 2019 in Big Data Hadoop by Quil
 • 1,159 views
0 votes
1 answer

Output types of mapper and reducer does not match

Jul 22, 2019 in Big Data Hadoop by Karan
 • 2,791 views
0 votes
1 answer

Which one is better MR or Spark?

Jul 15, 2019 in Big Data Hadoop by Lohit
 • 1,855 views
0 votes
2 answers

Exception in thread "main" java.lang.UnsupportedClassVersionError

Jul 15, 2019 in Big Data Hadoop by KS
 • 1,413 views
0 votes
2 answers

How to set up Map and Reduce Tasks?

Jul 12, 2019 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 2,217 views
0 votes
1 answer

Working of map function on data

Jul 11, 2019 in Apache Spark by Medha
 • 948 views
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1 answer

Can we use different i/p and o/p format classes in mapreduce code?

Jul 10, 2019 in Big Data Hadoop by Joshua
 • 833 views
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What is the use of setting the name of the job in mapreduce?

Jul 10, 2019 in Big Data Hadoop by Quill
 • 626 views
0 votes
1 answer

How to solve error caused due to output types of mapper and reducer not matching?

Jul 9, 2019 in Big Data Hadoop by Karan
 • 1,150 views
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How does Hadoop process data which is split across multiple boundaries in an HDFS?

Jul 1, 2019 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 971 views
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1 answer

What are the challenges we faced as Hadoop Admin?

Jun 25, 2019 in Big Data Hadoop by deepak
 • 2,493 views
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Code was tested successfully in Dev and Test. When deployed to Productions it is failing. As an admin, how do you track the issue?

Jun 21, 2019 in Big Data Hadoop by Deepak P
 • 1,039 views
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2 answers

if HDFS threshold has been reached. What is the our approach to resolve this issue?

Jun 21, 2019 in Big Data Hadoop by Manish
 • 1,479 views
0 votes
1 answer

Difference b/w reduce and reduceLeft

Jun 20, 2019 in Big Data Hadoop by Keshav
 • 3,064 views
0 votes
1 answer

Multiple input for MapReduce job

Jun 20, 2019 in Big Data Hadoop by Kunal
 • 6,212 views
0 votes
1 answer

Error: Container is running beyond Memory Limits

Jun 20, 2019 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 6,832 views
0 votes
1 answer

In Which cluster(Dev or Prod) we test the job?

Jun 20, 2019 in Big Data Hadoop by Manish
 • 604 views
0 votes
1 answer

Explain how the MongoDB MapReduce and Hadoop MapReduce are similar to each other and explain the differences if there are any.

Jun 18, 2019 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 745 views
0 votes
1 answer

Command use to kill the job in MapReduce.

Jun 14, 2019 in Big Data Hadoop by rajiv
 • 650 views
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