July 2017
Intermediate to advanced
796 pages
18h 55m
English
Content preview from Scala and Spark for Big Data Analytics
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HDFS High Availability
HDFS is a Master-Slave cluster with the NameNode as the master and the 100s, if not 1000s of DataNodes as slaves, managed by the master node. This introduces a Single Point of Failure (SPOF) in the cluster as if the Master NameNode goes down for some reason, the entire cluster is going to be unusable. HDFS 1.0 supports an additional Master Node known as the Secondary NameNode to help with recovery of the cluster. This is done by maintaining a copy of all the metadata of the filesystem and is by no means a Highly Available System requiring manual interventions and maintenance work. HDFS 2.0 takes this to the next level by adding support for full High Availability (HA).
HA works by having two Name Nodes in an active-passive ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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