5 Keys to Big Data Success
As Big Data becomes more pervasive throughout farming, itās important to understand what farmers need to make data collection and analysis successful, says John Fulton, Extension specialist at Auburn University.
"For many, there is no clear incentive or objective about the ...
When to use Pig Latin versus Hive SQL?
Once your big data is loaded into Hadoop, whatās the best way to use that data?Ā Youāll need some way to filter and aggregate the data, and then apply the results for something useful.Ā Collecting terabytes and petabytes of web ...
HBase Architecture
HBase ā The Basics:
HBase is an open-source, NoSQL, distributed, non-relational, versioned, multi-dimensional, column-oriented store which has been modeled after Google BigTable that runs on top of HDFS.Ā āāNoSQLā is a broad term meaning that the database isnāt an RDBMS which ...
Use Cases Of MongoDB
MongoDB is a relatively new contender in the data storage circle compared to giant like Oracle and IBM DB2, but it has gained huge popularity with their distributed key value store, MapReduce calculation capability and document oriented NoSQL features.
MongoDB has ...
Introduction to Impala
Impala in terms of Hadoop has got the significance because of its,
Scalability
Flexibility
Efficiency
Whatās Impala?
Impala isā¦
Interactive SQLāImpala is typically 5 to 65 times faster than Hive as it minimized the response time to just seconds, not minutes.
Nearly ANSI-92 standard and compatible with ...
Free Cloudera Impala Book
Get free Cloudera Impala, in PDF format, for free from the Cloudera website, in association with the Strata Conference and Hadoop World.Ā See the below link for the book info from the publisher as well as the link to download ...
Hadoop Interview Questions ā HDFS
Are you planning to pursue a career in Hadoop or looking out for a job opportunity in Hadoop? Here is list of Hadoop interview questions which covers HDFS
What is the difference between a Hadoop database and Relational Database?
Hadoop is not ...
Hadoop FS Shell Commands
Hadoop file system (fs) shell commands are used to perform various file operations like copying file, changing permissions, viewing the contents of the file, changing ownership of files, creating directories etc.
The syntax of fs shell command is
hadoop fs <args>
All the ...
Pig Interview Questions
Can you give us some examples how Hadoop is used in real time environment?
Let us assume that we have an exam consisting of 10 Multiple-choice questions and 20 students appear for that exam. Every student will attempt each question. For ...
Hadoop Cluster Commissioning and Decommissioning Nodes
To add new nodes to the cluster:
1. Add the network addresses of the new nodes to the include file.
hdfs-site.xml
<property>
<name>dfs.hosts</name>
<value>/<hadoop-home>/conf/includes</value>
<final>true</final>
</property>
mapred-site.xml
<property>
<name>mapred.hosts</name>
<value>/<hadoop-home>/conf/includes</value>
<final>true</final>
</property>
Datanodes that are permitted to connect to the namenode are specified in a
file whose name is specified by the dfs.hosts property.
Includes file ...