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Glossary | Hadoop ABCD
3Vs of BigData Three Vs of Big Data: Volume (Big), Velocity (Fast) and Variety (Smart) More clearly define, Big Data is typically explained via 3Vs – Volume (2.5 Quintillion Bytes of data are estimate...
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Hadoop HDFS Federation | Hadoop ABCD
In Hadoop 1.x, there is only one NameNode (i.e allow only one Active NameNode) in a cluster, which maintains a single namespace (single directory structure) for the entire cluster. Regarding that Hado...
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Deep-drive: Understanding NameNode | Hadoop ABCD
The NameNode is the most critical piece of the system of an HDFS file system. The NameNode manages the entire HDFS file system metadata (i.e owners of files, file permission, no of blocks, block locat...
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Hadoop HDFS High Availability | Hadoop ABCD
See: The Glossary Prior to Hadoop 2.x (Hadoop 1.x), the NameNode was a single point of failure (SPOF) in an HDFS cluster. Each cluster had a single NameNode, and if that machine or process became unav...
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Installing Cloudera Manager and CDH on Amazon EC2: Part-1 | Hadoop ABCD
Log into the AWS console. Go to EC2. Please refer my previous post "Setting up infrastructure with Amazon EC2: Part-1" for more info. I have chosen CentOS 6.4 as our underlying operating system. I hav...
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HDFS File Blocks Distribution in DataNodes | Hadoop ABCD
Background When a file is written to HDFS, it is split up into big chucks called data blocks, whose size is controlled by the parameter dfs.block.size in the config file hdfs-site.xml (in my case – le...