Most viewed questions in Big Data Hadoop

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1 answer

How to check Cloudera Manager Service status?

There surely is a command to check ...READ MORE

Dec 17, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 3,679 views
0 votes
1 answer

How to update the existing record in HDFS?

Hi@akhtar, HDFS follows Write Once Read Many times ...READ MORE

Oct 15, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,678 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
 • 65,730 points • 3,674 views
0 votes
1 answer

Differences between Hadoop-common, Hadoop-core and Hadoop-client?

To help provide some additional details regarding ...READ MORE

Mar 29, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 3,659 views
0 votes
1 answer

Install PostgreSQL JDBC driver for Sqoop

All you have to do to install ...READ MORE

Jun 6, 2019 in Big Data Hadoop by Quill
 • 3,654 views
0 votes
1 answer

What is the use of ZooKeeper in Hbase?

Hey, The zookeeper is used to maintain the ...READ MORE

May 21, 2019 in Big Data Hadoop by Gitika
 • 65,730 points • 3,648 views
0 votes
1 answer

How to create a FileSystem object that can be used for reading from and writing to HDFS?

Read operation on HDFS In order to read ...READ MORE

Mar 21, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points
edited Mar 22, 2018 by nitinrawat895 • 3,647 views
0 votes
1 answer

How to change the Hive table comment?

Yes, it is possible to change the ...READ MORE

May 20, 2019 in Big Data Hadoop by Tina
 • 3,644 views
0 votes
1 answer

getting error: -bash: syntax error near unexpected token `('

hi, you should give space between PigStorage and ...READ MORE

May 9, 2020 in Big Data Hadoop by anonymous
 • 140 points • 3,640 views
0 votes
1 answer

Not able to run hdfs commands

Because you said it ran yesterday and ...READ MORE

Jan 3, 2019 in Big Data Hadoop by Omkar
 • 69,180 points • 3,622 views
0 votes
1 answer

Can DataNode and NameNode be commodity hardware?

DataNodes are the commodity hardware only as ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 3,615 views
0 votes
1 answer

Value for HADOOP_CONF_DIR from Cluster

Install Hadoop as well. In my case ...READ MORE

Jan 4, 2019 in Big Data Hadoop by Frankie
 • 9,830 points • 3,613 views
0 votes
1 answer

What metadata is stored on a DataNode when a block is written to it?

Let me explain you step by step.  Each ...READ MORE

Jul 23, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,613 views
0 votes
1 answer

Difference between a failed task attempt and a killed task attempt

Let me explain you the difference between ...READ MORE

Jul 24, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,603 views
0 votes
1 answer

Copy a table in HBase

Directly its not possible as in case ...READ MORE

Feb 14, 2019 in Big Data Hadoop by Loki
 • 3,600 views
0 votes
1 answer

How to load data from HDFS into pig relation?

Hey, To load data from HDFS to pig ...READ MORE

May 7, 2019 in Big Data Hadoop by Gitika
 • 65,730 points • 3,598 views
0 votes
1 answer

How to import data to hbase database?

First you have to have the file ...READ MORE

Jul 23, 2019 in Big Data Hadoop by Kiran
 • 3,596 views
+1 vote
1 answer

How to copy file from Local file system to HDFS?

Hi@akhtar, You can copy files from your local ...READ MORE

Oct 20, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,587 views
0 votes
1 answer

Not able to insert in hive partition table

You have to add the partition before ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 3,580 views
0 votes
1 answer

Using HBase jar files. Where to download and set classpath

There are many sites you can get ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 3,580 views
0 votes
1 answer

Start-dfs.sh daemons not starting. localhost: mkdir: cannot create directory `/user': Permission denied

Make the following changes to the hadoop-env.sh ...READ MORE

Dec 6, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 3,561 views
0 votes
1 answer

Command to see the status of MapReduce job?

Hi, You can use this command given below: Syntax: $ ...READ MORE

Jun 14, 2019 in Big Data Hadoop by Gitika
 • 65,730 points • 3,552 views
–1 vote
1 answer

Display contents of my Parquet file.

Make sure you are running from the ...READ MORE

Dec 19, 2018 in Big Data Hadoop by Omkar
 • 69,180 points • 3,551 views
0 votes
1 answer

How to delete a directory from Hadoop cluster which is having comma(,) in its name?

Just try the following command: hadoop fs -rm ...READ MORE

May 7, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,545 views
0 votes
1 answer

What is ETL tool in Hadoop?

Hi@akhtar, ETL means extract, transform, load. It is ...READ MORE

Feb 2, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,541 views
0 votes
1 answer

How to Rerunning a Coordinator Action or Multiple Actions in Oozie?

Hey, The rerun option reruns a terminated (=TIMEDOUT=, SUCCEEDED, KILLED, ...READ MORE

Jun 24, 2019 in Big Data Hadoop by Gitika
 • 65,730 points • 3,532 views
0 votes
1 answer

Difference b/w reduce and reduceLeft

The reduceLeft method takes an associative binary ...READ MORE

Jun 20, 2019 in Big Data Hadoop by Kriti
 • 3,530 views
0 votes
1 answer

Pig: Difference between inner bag and outer bag

Outer Bag: An outer bag is nothing but ...READ MORE

Jul 16, 2019 in Big Data Hadoop by Firoz
 • 3,524 views
0 votes
1 answer

Hdfs Service Systemd - startup

I guess the issue you are facing ...READ MORE

Mar 29, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,521 views
0 votes
1 answer

Installing Oozie on Linux System

Download Oozie from this link: http://www.apache.org/dyn/closer.lua/oozie/ Extract the files. ...READ MORE

Feb 28, 2019 in Big Data Hadoop by Rajan
 • 3,511 views
0 votes
3 answers

Cloudera Hadoop - Daemons not running

Please run below mentioned command. It will ...READ MORE

Aug 7, 2018 in Big Data Hadoop by Priyaj
 • 58,020 points • 3,509 views
0 votes
1 answer

How to change block size in Hadoop dynamically?

Hi@akhtar, By default, the block size is 64MB ...READ MORE

Sep 25, 2020 in Big Data Hadoop by akhtar
 • 38,260 points • 3,504 views
0 votes
1 answer

ERROR [main] client.HConnectionManager$HConnectionImplementation: Can't get connection to ZooKeeper: KeeperErrorCode = ConnectionLoss for /hbase ERROR: KeeperErrorCode = ConnectionLoss for /hbase

Hi@akhtar, Before starting Hbase Shell, make sure you ...READ MORE

Apr 30, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,497 views
0 votes
1 answer

What are active and passive “NameNodes” in Hadoop?

In HA (High Availability) architecture, we have ...READ MORE

Dec 14, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,495 views
0 votes
1 answer

Hive: org.apache.hadoop.security.AccessControlException Permission denied: user

This error is generally thrown when the ...READ MORE

Aug 1, 2019 in Big Data Hadoop by Waniku
 • 3,472 views
0 votes
1 answer

How to practice programming with Hadoop?

Well there are multiple ways to solve ...READ MORE

Mar 30, 2018 in Big Data Hadoop by kurt_cobain
 • 9,350 points • 3,468 views
0 votes
1 answer

how to store images and videos on to HDFS?

HDFS is capable to accept data in ...READ MORE

Jul 16, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 3,460 views
0 votes
1 answer

Issue with Python Read file as stream from HDFS.

The easiest way is using the following ...READ MORE

Jun 26, 2019 in Big Data Hadoop by ravikiran
 • 4,620 points • 3,454 views
0 votes
1 answer

Multiple rows to columns in hive

Hi, You need to create your own customize ...READ MORE

Sep 4, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,446 views
0 votes
1 answer

Killing an Application from ResourceManager Web UI

In hadoop v2.7.1, if you open the ...READ MORE

Apr 23, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 3,443 views
0 votes
1 answer

What is Metastore in Hive?

It stores metadata for Hive tables (like their schema ...READ MORE

Dec 20, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,441 views
0 votes
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]

Hi@akhtar, This type of error indicates a write ...READ MORE

Apr 30, 2020 in Big Data Hadoop by MD
 • 95,460 points • 3,412 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
 • 65,730 points • 3,401 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
 • 3,400 views
+1 vote
1 answer

sql exception when exporting

Hello @Hemanth, the error String or binary data ...READ MORE

Sep 4, 2019 in Big Data Hadoop by Ramya
 • 3,395 views
0 votes
1 answer

Write data into hive table in a parquet

Below is an example query which you ...READ MORE

Jul 26, 2019 in Big Data Hadoop by Sadu
 • 3,395 views
0 votes
1 answer

What is Shared Edit Logs in case of Stand By Name Node in Hadoop 2.x?

Yes, Shared Edit Logs exist in case ...READ MORE

Jun 19, 2019 in Big Data Hadoop by Hansini
 • 3,385 views
0 votes
1 answer

What is fork Keyword in Oozie? How Fork and Join keyword are related t o each other in Oozie?

Hey, Basically, when we want to run multiple jobs ...READ MORE

Jun 12, 2019 in Big Data Hadoop by Gitika
 • 65,730 points • 3,383 views
0 votes
1 answer

What is the significance of ‘IF EXISTS” clause while dropping a table in Hive?

Hi, Since the table being dropped does not ...READ MORE

Jun 26, 2019 in Big Data Hadoop by Gitika
 • 65,730 points • 3,377 views
0 votes
1 answer

Sqoop export not working

The issue that you might be getting ...READ MORE

Jul 16, 2019 in Big Data Hadoop by Tina
 • 3,359 views
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