Quantcast File System (QFS) is a high-performance, open source, fault-tolerant, distributed file system developed to support MapReduce processing, or other applications reading and writing large files sequentially. It is an alternative to HDFS for large-scale batch data processing.
QFS consists of 3 components:
- Metaserver – a central process metadata server that manages the directory structure and maps of files to physical storage
- Chunk Server – the distributed component of the distributed file system. A chunk server runs on each machine that will host data, manages I/O to its hard drives, and monitors its activity and capacity
- Client Library – a library that provides the file system API to allow applications to interface with QFS. It makes requests of the metaserver to identify which chunk servers hold (or will hold) its data, then interacts with the chunk servers directly to read and write
QFS is written in C++, operates within a fixed memory footprint, and uses direct I/O.
- Incremental Scalability.
- Fault Tolerance.
- Fine-tunable Replication, Striping, Recovery Mode.
- Data Integrity.
- Reed-Solomon (RS) error correction.
- Client Side Metadata Caching.
- File Writes.
- Client Side Fail-over.
- Direct I/O.
- Manages its own memory within a fixed footprint.
- Language Support.
- FUSE support on Linux.
- Unix style permissions support.
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