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HDFS , developed by the Apache Software Foundation, is a distributed file system designed to hold very large amounts of data (terabytes or even petabytes). Its architecture is similar to GFS, i.e. a server/client architecture. The HDFS is normally installed on a cluster of computers.
will first remove baz/, then bar/ and finally foo/ thus removing the entire directory tree specified in the command argument. rmdir will not remove a directory if it is not empty in UNIX. The rm command will remove a directory and all its contents recursively. For example:
allows a user to list the contents of the AFS directory, examine the ACL associated with the directory and access subdirectories. Insert (i) allows a user to add new files or subdirectories to the directory. Delete (d) allows a user to remove files and subdirectories from the directory. Administer (a) allows a user to change the ACL for the ...
Apache Hadoop (/ h ə ˈ d uː p /) is a collection of open-source software utilities for reliable, scalable, distributed computing.It provides a software framework for distributed storage and processing of big data using the MapReduce programming model.
Some researchers have made a functional and experimental analysis of several distributed file systems including HDFS, Ceph, Gluster, Lustre and old (1.6.x) version of MooseFS, although this document is from 2013 and a lot of information are outdated (e.g. MooseFS had no HA for Metadata Server at that time).
Hierarchical Data Format (HDF) is a set of file formats (HDF4, HDF5) designed to store and organize large amounts of data.Originally developed at the U.S. National Center for Supercomputing Applications, it is supported by The HDF Group, a non-profit corporation whose mission is to ensure continued development of HDF5 technologies and the continued accessibility of data stored in HDF.
The record size is stored on a file-by-file basis in special entries in the directory table. [ 19 ] Sequential access methods for IBM's z/OS and z/VSE mainframe operating systems: Basic Sequential Access Method (BSAM), Basic Partitioned Access Method (BPAM) and Queued Sequential Access Method (QSAM); see Access methods and Data set (IBM ...
Apache Parquet is a free and open-source column-oriented data storage format in the Apache Hadoop ecosystem. It is similar to RCFile and ORC, the other columnar-storage file formats in Hadoop, and is compatible with most of the data processing frameworks around Hadoop.