Daily Archives: April 9, 2014

Backup Node in Hadoop 3

Backup Node: Backup Node in hadoop is an extended checkpoint node that performs checkpointing and also supports online streaming of file system edits. The advantage over the checkpoint node is that the namespace (meta-data) present in it’s main memory is always in sync with primary namenode file system namespace, Since it maintains an in-memory, up-to-date copy of file system namespace and accepts a real time online stream of file system […]

Checkpoint Node in hadoop 2

Checkpoint Node Checkpoint node in hadoop is a new implementation of the Secondary NameNode to solve the drawbacks of Secondary NameNode. Main function of the Checkpoint Node in hadoop is to create periodic checkpoints of file system metadata by merging edits file with fsimage file. Usually the new fsimage from merge operation is called as a checkpoint. Checkpoint Node periodically downloads the fsimage and edits log files from primary NameNode and […]

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I have attended Siva’s Spark and Scala training. He is good in presentation skills and explaining technical concepts easily to everyone in the group. He is having excellent real time experience and provided enough use cases to understand each concepts. Duration of the course and time management is awesome. Happy that I found a right person on time to learn Spark. Thanks Siva!!!

Dharmeswaran ETL / Hadoop Developer Spark Nov 2016 September 21, 2017