Reliable, Scalable, And High ­Performance Distributed Storage: Distributed Metadata Management

Ceph’s MDS diverges from conventional metadata storage techniques, and in doing so facilitates adaptive file system and workload partitioning among servers, improved metadata availability, and failure recovery. Specifically, file system metadata updates are initially written to large, lazily-trimmed per-MDS journals that absorb temporary and repetitive updates. File (inode) metadata is then embedded in the file system namespace and stored inside per-directory objects for efficient read access and metadata prefetching. Notably, MDS defines the namespace hierarchy in terms of directory fragments, facilitating fine-grained load distribution even for large or busy directories, and implements a traffic control mechanism for dispersing load generated by flash crowds—sudden concurrent access by thousands of client nodes—across multiple nodes in the MDS cluster.

Publication Date
19 February 2014

Tags
metadata server metadata Ceph


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