LocoFS: A Loosely-Coupled Metadata Service for
Distributed File Systems
SessionCutting Edge File Systems
Event Type
Paper
File Systems
I/O
Storage
TimeTuesday, November 14th10:30am -
11am
Location405-406-407
DescriptionKey-Value stores provide scalable metadata service for
distributed file systems. However, the metadata’s
organization itself, which is organized using a
directory tree structure, does not fit the key-value
access pattern, thereby limiting the performance. To
address this issue, we propose a distributed file system
with a loosely-coupled metadata service, LocoFS, to
bridge the performance gap between file system metadata
and key-value stores. LocoFS is designed to decouple the
dependencies between different kinds of metadata with
two techniques. First, LocoFS decouples the directory
content and structure, which organizes file and
directory index nodes in a flat space while reversely
indexing the directory entries. Second, it decouples the
file metadata to further improve the key-value access
performance. Evaluations show that LocoFS with eight
nodes boosts the metadata throughput by 5 times, which
approaches 93% throughput of a single-node key-value
store, compared to 18% in the state-of-the-art
IndexFS.
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