Most answered questions in Apache Spark

0 votes
1 answer

Why does sortBy transformation trigger a Spark job?

Actually, sortBy/sortByKey depends on RangePartitioner (JVM). So ...READ MORE

May 8, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 1,374 views
0 votes
1 answer

How to get the number of elements in partition?

rdd.mapPartitions(iter => Array(iter.size).iterator, true) This command will ...READ MORE

May 8, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 1,953 views
0 votes
1 answer

How is Apache Spark different from the Hadoop approach?

In Hadoop MapReduce the input data is ...READ MORE

May 7, 2018 in Apache Spark by BD Master
 • 987 views
0 votes
1 answer

start-master and start-all?

sbin/start-master.sh : Starts a master instance on ...READ MORE

May 7, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 2,009 views
0 votes
1 answer

cache tables in apache spark sql

Caching the tables puts the whole table ...READ MORE

May 4, 2018 in Apache Spark by Data_Nerd
 • 2,390 points • 3,015 views
0 votes
1 answer

Spark Monitoring with Ganglia

Ganglia looks like a good option for ...READ MORE

May 4, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 1,072 views
0 votes
1 answer

Spark cannot access local file anymore?

By default it will access the HDFS. ...READ MORE

May 3, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 1,283 views
0 votes
1 answer

Can I read a CSV represented as a string into Apache Spark?

You can use the following command. This ...READ MORE

May 3, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 2,154 views
0 votes
1 answer

Why is collect in SparkR slow?

It's not the collect() that is slow. ...READ MORE

May 3, 2018 in Apache Spark by Data_Nerd
 • 2,390 points • 2,532 views
0 votes
1 answer

When not to use foreachPartition and mapPartition?

With mapPartion() or foreachPartition(), you can only ...READ MORE

Apr 30, 2018 in Apache Spark by Data_Nerd
 • 2,390 points • 6,684 views
0 votes
1 answer

Why is Spark faster than Hadoop Map Reduce

Firstly, it's the In-memory computation, if the file ...READ MORE

Apr 30, 2018 in Apache Spark by shams
 • 3,670 points • 1,119 views
0 votes
1 answer

How to get Spark dataset metadata?

There are a bunch of functions that ...READ MORE

Apr 26, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 4,443 views
0 votes
1 answer

Spark Kill Running Application

you can copy the application id from ...READ MORE

Apr 25, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 1,510 views
0 votes
1 answer

How to stop messages from being displayed on spark console?

In your log4j.properties file you need to ...READ MORE

Apr 24, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 5,050 views
0 votes
1 answer

Efficient way to read specific columns from parquet file in spark

As parquet is a column based storage ...READ MORE

Apr 20, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 7,325 views
0 votes
1 answer

reduceByKey or reduceByKeyLocally , which should be preferred ?

Yes, they both merge the values using ...READ MORE

Apr 20, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 2,119 views
0 votes
1 answer

Which query to use for better performance, join in SQL or using Dataset API?

DataFrames and SparkSQL performed almost about the ...READ MORE

Apr 19, 2018 in Apache Spark by kurt_cobain
 • 9,390 points • 1,537 views
0 votes
1 answer

Is there any way to check the Spark version?

There are 2 ways to check the ...READ MORE

Apr 19, 2018 in Apache Spark by nitinrawat895
 • 11,380 points • 8,041 views
0 votes
1 answer

Changing Column position in spark dataframe

Yes, you can reorder the dataframe elements. You need ...READ MORE

Apr 19, 2018 in Apache Spark by Ashish
 • 2,650 points • 13,262 views
0 votes
0 answers

What allows spark to periodically persist data about an application such that it can recover from failures? [closed]

What allows spark to periodically persist data ...READ MORE

Nov 26, 2020 in Apache Spark by ritu
 • 960 points
closed Nov 26, 2020 by MD • 2,494 views
0 votes
0 answers

The number of stages in a job is equal to the number of RDDs in DAG. however, under one of the cgiven conditions, the scheduler can truncate the lineage. identify it. [closed]

14)The number of stages in a job ...READ MORE

Nov 25, 2020 in Apache Spark by Edureka
 • 200 points
closed Nov 25, 2020 by MD • 4,824 views
0 votes
0 answers

What is the output of the following code? [closed]

What is the output of the following ...READ MORE

Nov 25, 2020 in Apache Spark by Edureka
 • 200 points
closed Nov 26, 2020 by MD • 621 views
0 votes
0 answers

A Dataframe can be created from an existing RDD. You would create the Dataframe from the existing RDD by inferring schema using case classes in which one of the given classes? [closed]

A Dataframe can be created from an ...READ MORE

Nov 25, 2020 in Apache Spark by Edureka
 • 200 points
closed Nov 26, 2020 by MD • 1,882 views
0 votes
0 answers

What does the below code print? [closed]

What does the below code print? val AgeDs ...READ MORE

Nov 25, 2020 in Apache Spark by ritu
 • 960 points
closed Nov 25, 2020 by Gitika • 928 views
0 votes
0 answers

17)from the given choices, identify the value returned by $"whatever"?

17)from the given choices, identify the value ...READ MORE

Nov 25, 2020 in Apache Spark by ritu
 • 960 points • 1,271 views
0 votes
0 answers

Unable to get the Job status and Group ID java- spark standalone program with databricks

package com.dataguise.test; import java.io.IOException; import java.util.concurrent.CountDownLatch; import java.util.concurrent.TimeUnit; import org.apache.spark.SparkContext; import org.apache.spark.SparkJobInfo; import ...READ MORE

Jul 23, 2020 in Apache Spark by kamboj
 • 140 points
recategorized Jul 28, 2020 by Gitika • 1,963 views
0 votes
0 answers

Do we have any platform where we can submit spark application.

looking for a platform where we can ...READ MORE

May 12, 2020 in Apache Spark by anonymous
 • 120 points • 626 views
–1 vote
0 answers

How to parse an S3 XML file to find tags using apache spark

How can one parse an S3 XML ...READ MORE

Mar 18, 2020 in Apache Spark by anonymous
 • 110 points • 1,800 views
0 votes
0 answers

One Hot Encoding in Apache Spark

The following code that I wrote for ...READ MORE

Feb 11, 2020 in Apache Spark by Manish
 • 120 points • 2,517 views
0 votes
0 answers

not able to get output in spark streaming??

Hi everyone, I tried to count individual words ...READ MORE

Feb 4, 2020 in Apache Spark by akhtar
 • 38,230 points • 670 views
0 votes
0 answers

Error: Package: R-core-devel-3.6.0-1el7.x86_64 (epel) Requires: pcre2-devel

Hi, I am getting this error when try ...READ MORE

Jan 31, 2020 in Apache Spark by Hasid
 • 370 points • 732 views
+1 vote
0 answers

How to create a list of RDDs(or RDD of RDDs, if possible) from a single JavaRDD<List<Integers>> in Java?

Hi, I have the input RDD as a ...READ MORE

Jan 11, 2020 in Apache Spark by itsroops
 • 130 points • 2,662 views
+1 vote
0 answers

how to access hive view using spark2

We do not have access to hive ...READ MORE

Dec 29, 2019 in Apache Spark by anonymous
 • 130 points • 1,820 views
+1 vote
0 answers

How to combine a nested json file, which is being partitioned on the basis of source tags, and has varying internal structure, into a single json file; ( differently sourced Tag and varying structure)

Source tags are different: {  x : [         { ...READ MORE

Oct 11, 2019 in Apache Spark by anonymous
 • 160 points • 906 views
+1 vote
0 answers

Difference Between rdd dataframe dataset [closed]

Sep 13, 2019 in Apache Spark by Rajesh pagadala
closed Sep 13, 2019 by Omkar • 882 views
+1 vote
0 answers

What is the use case of map and flatMap? [closed]

What is the major use case for ...READ MORE

Aug 25, 2019 in Apache Spark by anonymous
 • 130 points
closed Aug 26, 2019 by Omkar • 1,420 views
+2 votes
0 answers

How can I import zip files and process the excel files ( inside the zip files ) by using pyspark connecting with pymongo ?

How can I import zip files and ...READ MORE

Aug 6, 2019 in Apache Spark by Ahmed
 • 636 views
0 votes
0 answers

How to define SparkConf?

Can anyone explain how to define SparkConf? READ MORE

Aug 1, 2019 in Apache Spark by Danish
 • 321 views
–1 vote
0 answers

what is the benefit of repartition(1) and coalesce(1). When we save data we use df.repartition(1).so how many partition it will create

what is the benefit of repartition(1) and ...READ MORE

Jul 26, 2019 in Apache Spark by kumar Ma
 • 5,027 views
0 votes
0 answers

What is immutabiliity in Spark?

Can anyone explain what is immutability in ...READ MORE

Jul 23, 2019 in Apache Spark by Risha
 • 343 views
0 votes
0 answers

Load data to mysql from local

I'm trying to load data to mysql ...READ MORE

Jul 23, 2019 in Apache Spark by Yogi
 • 842 views
0 votes
0 answers

How to create RDD as string file?

Can anyone suggest how to create RDD ...READ MORE

Jul 5, 2019 in Apache Spark by anand
 • 662 views
0 votes
0 answers

When we create an RDD, does it bring the data and load it into the memory?

Can anyone suggest when we create an ...READ MORE

Jul 3, 2019 in Apache Spark by monalisa
recategorized Jul 4, 2019 by Gitika • 1,107 views
0 votes
0 answers

WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable [closed]

Hi All I am running Scala program on ...READ MORE

May 5, 2019 in Apache Spark by Vishal
closed May 6, 2019 by Omkar • 5,268 views
0 votes
0 answers

what are the memory issues in spark ?

Mar 18, 2019 in Apache Spark by satish kumar
 • 180 points • 1,714 views
0 votes
0 answers

Why doesn't my Spark Yarn client runs on all available worker machines?

I am running an application on Spark ...READ MORE

Feb 22, 2019 in Apache Spark by Uzair Ahmad
edited Feb 22, 2019 by Omkar • 7,700 views
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