Secondary Name Node
Hadoop has server role called the Secondary Name Node. A common misconception is that this role provides a high availability backup for the Name Node. This is not the case.
The Secondary Name Node occasionally connects to the Name Node (by default, ever hour) and grabs a copy of the Name Node’s in-memory metadata and files used to store metadata (both of which may be out of sync). The Secondary Name Node combines this information in a fresh set of files and delivers them back to the Name Node, while keeping a copy for itself.
Should the Name Node die, the files retained by the Secondary Name Node can be used to recover the Name Node. In a busy cluster, the administrator may configure the Secondary Name Node to provide this housekeeping service much more frequently than the default setting of one hour. Maybe every minute.
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The 'Big Data' industry - the ability to access , analyze and use humungous
volumes of data through specific technology - will require a whole new army of
data workers globally. India itself will require a minimum of 1,00,000 data
scientists in the next couple of years, in addition to scores of data managers and
data analysts , to support the fast emerging Big Data space.
The exponentially decreasing costs of data storage combined with the soaring
volume of data being captured presents challenges and opportunities to those who
work in the new frontiers of data science. Businesses, government agencies, and
scientists leveraging data-based decisions are more successful than those relying
on decades of trial-and-error. But taming and harnessing big data can be a
herculean undertaking. The data must be collected, processed and distilled,
analyzed, and presented in a manner humans can understand. Because there are no
degrees in data science, data scientists must grow into their roles. If you are
looking for resources to help you better understand big data and analytics, We have
the knowledge and experience needed to help make your systems contribute to
the success of your business. Form a tandem with us and take advantage of our
capacity to manage, process and analyze big data effectively, quickly and
economically.
BigDataTraining.IN has a strong focus and established thought leadership in the
area of Big Data and Analytics. We use a global delivery model to help you to
evaluate and implement solutions tailored to your specific technical and business
context.
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Hadoop & Big Data Training | Development | Consulting | Projects
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Hadoop & Big Data Training | Development | Consulting | Projects
http://www.bigdatatraining.in/hadoop-training-chennai/
http://www.hadooptrainingchennai.in/hadoop-training-in-chennai/
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