Trending questions in Big Data Hadoop

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Running Mapreduce on compressed data

It is very straight forward, no need ...READ MORE

Jul 24, 2019 in Big Data Hadoop by Nanda
 • 843 views
0 votes
1 answer

Hadoop security GroupMappingServiceProvider exception for Spark job via Dataproc API

If you don't want to turn off ...READ MORE

Jul 2, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 1,805 views
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1 answer

Does Caching stand as the only advantage in Spark compared to Hadoop?

Spark has much lower per job and ...READ MORE

Jul 31, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 546 views
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1 answer

HDFS: Upload file from local file system to Edureka cloud lab

To upload a file from your local ...READ MORE

Jul 11, 2019 in Big Data Hadoop by Zora
 • 1,385 views
0 votes
1 answer

Index LZO files

You can do it using the following ...READ MORE

Jul 24, 2019 in Big Data Hadoop by Rishi
 • 810 views
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1 answer

Hadoop input folder not found?

Hey, This is because the user directory not ...READ MORE

Jun 14, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 2,573 views
0 votes
1 answer

Pig script not dumping the data correctly

The first column is denoted by $0, ...READ MORE

Jul 15, 2019 in Big Data Hadoop by George
 • 1,184 views
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1 answer

Output Splitting problem in Hadoop

When you are loading two different files, ...READ MORE

Jul 16, 2019 in Big Data Hadoop by Sayni
 • 1,136 views
0 votes
1 answer

How to merge two consecutive regions using command line in HBase?

Hey, The Master and RegionServer both participate in ...READ MORE

May 29, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 3,194 views
0 votes
1 answer

Hadoop Hive: How to split string in Hive?

You can use the split function along ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,220 points • 12,012 views
0 votes
1 answer

Error: schemaTool failed

Hey, The error you got because you might ...READ MORE

May 13, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 3,876 views
0 votes
1 answer

Does HQL query go to all the nodes to process data?

InputSplits are created by logical division of ...READ MORE

Jul 26, 2019 in Big Data Hadoop by Tina
 • 669 views
0 votes
1 answer

What are the services running in Hadoop

Below are the services Running in Hadoop Hdfs  yarn mapreduce ozzie zookeeper hive hue hbase impala flume sqoop spark Depending ...READ MORE

Jun 24, 2019 in Big Data Hadoop by deepak
 • 2,084 views
0 votes
1 answer

Primary keys in apache Spark

from pyspark.sql.functions import monotonically_increasing_id df.withColumn("id", monotonically_increasing_id()).show() Verify the second ...READ MORE

Jul 11, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 1,301 views
0 votes
1 answer

Merging Files using PIG

In order to merge two or more ...READ MORE

Jul 4, 2019 in Big Data Hadoop by Tina
 • 1,599 views
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1 answer

CSV integration with Hadoop

For integrating Hadoop with CSV, we can use ...READ MORE

Jul 16, 2019 in Big Data Hadoop by Krish
 • 1,085 views
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2 answers

What is the difference between Oozie and Nifi ?

The main difference between Oozie and Nifi ...READ MORE

May 7, 2019 in Big Data Hadoop by Omkar
 • 69,220 points • 4,046 views
0 votes
1 answer

Hive Query: Split value

You can use the SUBSTR() in hive ...READ MORE

Jul 25, 2019 in Big Data Hadoop by Paul
 • 660 views
0 votes
1 answer

Syntax to mention that the data is enclosed in double quotes in pig

So, we will execute the below command, new_A_2 ...READ MORE

Jul 10, 2019 in Big Data Hadoop by Esha
 • 1,285 views
0 votes
1 answer

Query regarding temporary File type conversion of parquet to text

Suppose I have the below parquet file ...READ MORE

Jul 9, 2019 in Big Data Hadoop by Janan
 • 1,302 views
0 votes
1 answer

How to use Hbase shell in a bash script?

Hello, To write scripts with HBase shell it includes non-interactive mode, ...READ MORE

May 29, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 3,052 views
0 votes
1 answer

How can we ignore header line while loading data into Pig?

You can use the following code: A = ...READ MORE

Jul 22, 2019 in Big Data Hadoop by kiran
 • 695 views
0 votes
1 answer

Classes implementing InputFormat frequently

FileInputFormat : Base class for all file-based InputFormats Other ...READ MORE

Jul 24, 2019 in Big Data Hadoop by Reshma
 • 608 views
0 votes
1 answer

How to load data from flat files into different partitions of Hive table?

Hi, You can load data from flat files ...READ MORE

Jun 26, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 1,815 views
0 votes
1 answer

How to execute combiner and partitioning program without adding package name?

Yes, it is possible to do so ...READ MORE

Jul 16, 2019 in Big Data Hadoop by Raman
 • 956 views
0 votes
1 answer

Delimiter on the data

You can use this: import org.apache.spark.sql.functions.struct val df = ...READ MORE

Jul 25, 2019 in Big Data Hadoop by Vinay
 • 561 views
0 votes
0 answers

Sqoop exclude tables

How to exclude tables in sqoop if ...READ MORE

Jul 25, 2019 in Big Data Hadoop by Will
 • 598 views
0 votes
1 answer

Query regarding ArrayBuffer

It's because that is the syntax. This ...READ MORE

Jul 26, 2019 in Big Data Hadoop by Rishi
 • 507 views
0 votes
1 answer

Getting error while using sqoop import.

You are trying to execute the sqoop ...READ MORE

Jul 5, 2019 in Big Data Hadoop by Reshma
 • 1,407 views
0 votes
1 answer

Can we use different input and output format classes?

Yes, InputFormatClass and OutputFormatClass are independent of ...READ MORE

Jul 22, 2019 in Big Data Hadoop by Jishan
 • 650 views
0 votes
1 answer

Hive: "SET LOCATION" command not changing the location of the database

The SET LOCATION command does not change ...READ MORE

May 20, 2019 in Big Data Hadoop by Yash
 • 3,370 views
0 votes
1 answer

Difference between root of hdfs and local machine

The command hdfs dfs -put command is used to ...READ MORE

Jun 19, 2019 in Big Data Hadoop by Mahi
 • 2,072 views
0 votes
1 answer

How many partitions can do for one table?

Well, there are two kinds of partitions: 1. ...READ MORE

Jul 22, 2019 in Big Data Hadoop by Kunal
 • 635 views
0 votes
1 answer

Explain to me the correct way to get a Hadoop FileSystem object so that I can use it for reading from HDFS as well as writing to HDFS.

FileSystem needs only one configuration key to successfully ...READ MORE

Jun 7, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 2,584 views
0 votes
1 answer

Produce compressed data from map reduce

 It is straight forward and you can achieve ...READ MORE

Jul 24, 2019 in Big Data Hadoop by John
 • 527 views
0 votes
1 answer

Pdf to csv file format conversions

You can convert the pdf files with ...READ MORE

Jul 9, 2019 in Big Data Hadoop by Esha
 • 1,151 views
0 votes
1 answer

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

job.setOutputValueClass will set the types expected as ...READ MORE

Jul 9, 2019 in Big Data Hadoop by Rishab
 • 1,144 views
0 votes
1 answer

Limit for Namenode Quantity

Each file Schema = 150bytes   Block schema ...READ MORE

Jul 25, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 457 views
0 votes
3 answers

Hadoop Spark: How to iterate hdfs directories?

Using PySpark  hadoop = sc._jvm.org.apache.hadoop fs = hadoop.fs.FileSystem conf = ...READ MORE

Dec 5, 2018 in Big Data Hadoop by Kiran
 • 11,196 views
0 votes
1 answer

Mention what are the main configuration parameters that user need to specify to run MapReduce Job?

Hi, The user of the MapReduce framework needs ...READ MORE

Jun 10, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 2,374 views
0 votes
1 answer

Hive Query to sort data

If you are trying to sort first ...READ MORE

Jul 14, 2019 in Big Data Hadoop by Tina
 • 888 views
0 votes
1 answer

How do you start and stop region server in HBase?

Hey, You can run multiple region servers from ...READ MORE

May 23, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 3,107 views
0 votes
1 answer

How does Hive job execution flow works?

Hey, Hive query is received from UI or ...READ MORE

May 13, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 3,537 views
0 votes
0 answers

pattern mapreduce

i need to write some mapreduce pattern ...READ MORE

Jul 23, 2019 in Big Data Hadoop by tiza
 • 493 views
0 votes
1 answer

Hive queries from mapreduce gives Null Pointer Exception.

I think you have upgraded CDH. This ...READ MORE

Jun 4, 2019 in Big Data Hadoop by Rihan
 • 2,562 views
+1 vote
1 answer

Hello all! I try to install hadoop but I have a problem when trying to format data folder with command "hdfs namenode -format". Error: Could not find or load main class Username

Hey! The error seems like the problem is ...READ MORE

May 22, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 3,092 views
0 votes
1 answer

what is the difference between CREATE TABLE and CREATE EXTERNAL TABLE in Hive?

Hey, Although, we can create two types of ...READ MORE

Jun 26, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 1,563 views
0 votes
1 answer

How to increase reducers in Hive?

By default, only one reducer is assigned ...READ MORE

May 21, 2019 in Big Data Hadoop by Lohit
 • 3,147 views
0 votes
2 answers

Error While Running Oozie Project

You need to add your current user ...READ MORE

Aug 6, 2019 in Big Data Hadoop by Dhimanshu
 • 759 views
0 votes
1 answer

What are the modes of Hive metastore?

Hey, The metastore stores the schema and partition ...READ MORE

May 13, 2019 in Big Data Hadoop by Gitika
 • 65,770 points • 3,460 views
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