Users can run HDFS commands using Oozie’s FS action. Not all HDFS commands are supported, but the following common operations…
Some applications don’t want files to be split, as this allows a single mapper to process each input file in…
Performance issues in a map reduce jobs is a common problem faced by hadoop developers and there are a few hadoop…
Sequence files, map files, and Avro datafiles are all row-oriented file formats, which means that the values for each row…
Serialization is the process of turning structured objects into a byte stream for transmission over a network or for writing…
File compression brings two major benefits: it reduces the space needed to store files, and it speeds up data transfer…
HDFS transparently checksums all data written to it and by default verifies checksums when reading data. Datanodes are responsible for…