Most viewed questions in Big Data Hadoop

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“no such file or directory" in case of hadoop fs -ls

The behaviour that you are seeing is ...READ MORE

May 9, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points
edited May 9, 2018 by nitinrawat895 • 7,822 views
0 votes
1 answer

InvalidRequest: Error from server: code=2200 [Invalid query] message="Cannot execute this query as it might involve data filtering and thus may have unpredictable performance.

Hi@akhtar, You are trying to filter data from ...READ MORE

Apr 1, 2020 in Big Data Hadoop by MD
 • 95,440 points • 7,658 views
0 votes
1 answer

What are the hardware requirements for installing Hadoop on my Laptop?

You can either install Apache Hadoop on ...READ MORE

Apr 10, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 7,597 views
0 votes
2 answers

How do I output the results of a HiveQL query to CSV?

Hi, The insert overwrite directory is running in ...READ MORE

Dec 18, 2020 in Big Data Hadoop by akhtar
 • 38,230 points • 7,593 views
0 votes
1 answer

Change the owner and group of a file in Hadoop.

Hi@akhtar, You can use the Chown command. This ...READ MORE

Oct 1, 2020 in Big Data Hadoop by MD
 • 95,440 points • 7,587 views
0 votes
1 answer

can't find start-all.sh in hadoop installation

Actually, you are not mentioning the path for ...READ MORE

Apr 17, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 7,496 views
0 votes
1 answer

How to view contents of file in hadoop hdfs?

Hi@akhtar, You can use the Hadoop filesystem command ...READ MORE

Oct 5, 2020 in Big Data Hadoop by MD
 • 95,440 points • 7,456 views
0 votes
1 answer

Hadoop: java.lang.IllegalArgumentException: Wrong FS: expected: file:///

Try this: Configuration configuration = new Configuration(); FileSystem fs ...READ MORE

Dec 12, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 7,325 views
0 votes
2 answers

Limit the maximum number of dynamic partitions in Hive

if you are already on hive shell ...READ MORE

Jul 23, 2020 in Big Data Hadoop by Shantanu
 • 190 points • 7,298 views
0 votes
1 answer

java.lang.IllegalArgumentException: Unable to instantiate SparkSession with Hive support because Hive classes are not found.

 Try using the below build.sbt, code.scala and command ...READ MORE

Jul 30, 2019 in Big Data Hadoop by Kishan
 • 7,296 views
0 votes
1 answer

How to set replication factor in Hadoop?

Hi@akhtar, You can find setrep command in the ...READ MORE

Oct 1, 2020 in Big Data Hadoop by MD
 • 95,440 points • 7,291 views
0 votes
1 answer

What is the difference between Writable & WritableComparable in Hadoop?

Writable in an interface in Hadoop and types ...READ MORE

Oct 3, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 7,253 views
0 votes
1 answer

How to append files from local system to HDFS?

Hi@akhtar, You can use appendToFile in your Hadoop ...READ MORE

Oct 1, 2020 in Big Data Hadoop by MD
 • 95,440 points • 7,200 views
0 votes
1 answer

org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /try.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1).

Hi@akhtar, This error may occur if your datanode ...READ MORE

Apr 7, 2020 in Big Data Hadoop by MD
 • 95,440 points • 7,191 views
+2 votes
1 answer

how to escape delimiter in hive?

Refer to the below code used to ...READ MORE

Oct 31, 2019 in Big Data Hadoop by Kiran
 • 7,134 views
0 votes
1 answer

How do you handle the failure of Data node?

HDFS has Master Slave architecture in which Master ...READ MORE

Apr 9, 2019 in Big Data Hadoop by Gitika
 • 65,910 points
edited Apr 9, 2019 by Gitika • 7,107 views
0 votes
1 answer

Not able to find HDFS directory on my system?

I guess you didn't understand it correctly dfs.datanode.data.dir, ...READ MORE

Apr 17, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 7,099 views
0 votes
1 answer

How to set variables in HIVE scripts

You need to use the special hiveconf for variable ...READ MORE

Nov 20, 2020 in Big Data Hadoop by Gitika
 • 65,910 points • 7,052 views
0 votes
2 answers

Meaning of fs.defaultFS property in core-site.xml in hadoop

It allows to run dfs commands more ...READ MORE

Jan 22, 2020 in Big Data Hadoop by MD
 • 95,440 points • 7,048 views
0 votes
1 answer

Sqoop: ERROR tool.BaseSqoopTool: Error parsing arguments

There are two mistakes in the command ...READ MORE

Aug 2, 2019 in Big Data Hadoop by Kunal
 • 7,042 views
0 votes
1 answer

Hive: Assign subquery to variable

Refer to this example: Step1: Check table test1 ...READ MORE

Jul 30, 2019 in Big Data Hadoop by Tina
 • 7,021 views
0 votes
1 answer

How to programmatically access hadoop cluster where kerberos is enable?

Okay,here's the code snippet to work in the ...READ MORE

Mar 27, 2018 in Big Data Hadoop by coldcode
 • 2,080 points • 7,018 views
0 votes
1 answer

Hadoop Java: org.apache.hadoop.conf.Configuration does not exist error

To solve this error, add hadoop-common to ...READ MORE

Nov 21, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 7,003 views
+1 vote
1 answer

Sqoop: How to load all tables except one?

You can use the import-all-tables option and along with ...READ MORE

Feb 18, 2019 in Big Data Hadoop by Omkar
 • 69,210 points • 6,973 views
+1 vote
0 answers

Job failed as tasks failed. failedMaps

Hello All, I am new to hadoop, i ...READ MORE

Aug 1, 2019 in Big Data Hadoop by Hemanth
 • 250 points
edited Aug 1, 2019 by Omkar • 6,965 views
0 votes
1 answer

Converting CSV files to Parquet

--Create Hive external Table for existing data CREATE ...READ MORE

Jul 30, 2019 in Big Data Hadoop by Yogi
 • 6,854 views
0 votes
1 answer

How to move data from Oracle database to Hadoop?

Yes, you heard it correctly. Apache Sqoop is ...READ MORE

Apr 12, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 6,823 views
0 votes
3 answers

Sqoop: java.lang.RuntimeException: Could not load db driver class: com.mysql.jdbc.Driver

I add mysql driver for sqoop and it ...READ MORE

Mar 1, 2020 in Big Data Hadoop by Manh Quang
 • 180 points • 6,807 views
0 votes
1 answer

After installing Hadoop on Windows7, NameNode failed to start

You need to install Hadoop winutils to ...READ MORE

May 3, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 6,707 views
+1 vote
1 answer

Hadoop home path?

you can manually input the hadoop home ...READ MORE

Mar 26, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 6,702 views
0 votes
2 answers

How to pass a password to Sqoop import command?

You can directly pass the password in ...READ MORE

May 15, 2019 in Big Data Hadoop by Raj
 • 6,659 views
0 votes
1 answer

If there are two joins in hive, how many mapreduce jobs will run?

There are two conditions for no. of ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 6,629 views
0 votes
1 answer

Spark - load CSV file as DataFrame?

spark-csv is part of core Spark functionality ...READ MORE

Sep 25, 2018 in Big Data Hadoop by slayer
 • 29,350 points • 6,615 views
0 votes
1 answer

What is "java.sql.SQLException: org.apache.thrift.transport.TTransportException" in Hive?

This particular exception is related to Hive logs. ...READ MORE

Jul 30, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 6,565 views
0 votes
1 answer

Hadoop: "Caused by: java.lang.ClassNotFoundException" error

Have you placed the jar files in ...READ MORE

Nov 19, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 6,564 views
0 votes
1 answer

Where can I find hadoop-streaming.jar JAR file?

You will find the streaming jar here: ...READ MORE

Mar 21, 2018 in Big Data Hadoop by coldcode
 • 2,080 points • 6,496 views
0 votes
1 answer

Error: Container is running beyond Memory Limits

I had a similar problem while I was working ...READ MORE

Jun 20, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 6,490 views
0 votes
1 answer

What is the command to check the number of cores in Spark?

Go to your Spark Web UI & ...READ MORE

May 17, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 6,482 views
0 votes
1 answer

What is the purpose of shuffling and sorting phase in the reducer in Map Reduce?

Hi@akhtar, Shuffle phase in Hadoop transfers the map output from ...READ MORE

Dec 20, 2020 in Big Data Hadoop by MD
 • 95,440 points • 6,413 views
0 votes
1 answer

SyntaxException: line 1:67 no viable alternative at input ',' (... University with replication={'class':[SimpleStrategy],...)

Hi@akhtar, It is showing syntax error in your ...READ MORE

Apr 1, 2020 in Big Data Hadoop by MD
 • 95,440 points • 6,392 views
0 votes
2 answers

What is a container in YARN?

Yarn container are a process space where ...READ MORE

May 2, 2020 in Big Data Hadoop by anonymous
 • 6,304 views
0 votes
1 answer

What is hadoop.tmp.dir ?

hadoop.tmp.dir is used as the base for temporary ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 6,230 views
0 votes
1 answer

Cant connec to zookeeper: KeeperErrorCode = ConnectionLoss for HBase

Mostly HMaster is not running. Enter the ...READ MORE

Dec 28, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 6,217 views
0 votes
1 answer

What is thrift in Hive?

Hey, Thrift comes in the architectural part of ...READ MORE

May 13, 2019 in Big Data Hadoop by Gitika
 • 65,910 points • 6,182 views
+1 vote
2 answers

How to delete and update a record in Hive?

Hi, Earlier, there was no operation supported for ...READ MORE

Dec 18, 2020 in Big Data Hadoop by akhtar
 • 38,230 points • 6,019 views
0 votes
2 answers

Installing HBase on windows

This procedure worked for me. https://medium.com/@bishupaulose/install ...READ MORE

Aug 16, 2019 in Big Data Hadoop by Sam
 • 6,009 views
0 votes
1 answer

How Namenode handles data node failures?

Let me explain you the whole scenario. NameNode ...READ MORE

Jul 11, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 6,001 views
0 votes
1 answer

How do I include all the Hadoop dependencies using Maven?

This is a dependency mismatch error. I ...READ MORE

Apr 10, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 5,996 views
0 votes
1 answer

What's the difference between Hadoop and NoSQL ?

Let's start with the definitions Hadoop is an ...READ MORE

Apr 2, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 5,981 views
+2 votes
1 answer

Hadoop: Type mismatch in key from map: expected org.apache.hadoop.io.Text, recieved org.apache.hadoop.io.LongWritable

Add these 2 lines in your code ...READ MORE

Nov 15, 2018 in Big Data Hadoop by Omkar
 • 69,210 points • 5,965 views
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