Sun’s network file system

A figure from the chapter describing the high-level architecture of a distributed file system. It consists of multiple clients that access data over a network fom a centralized file server. The image shows that the file server as a RAID array, which although common, is not a necessity for a distributed file system.
Another figure from the chapter that describes how a distributed file system is actually composed of a client-side and a server-side file system to provide transparent access to the client applications.
A local file system (shown on the left) maintains the mapping of the file descriptor to the file (inode number) and the offset within a file. In contrast, this state is stored by the client-side file system for NFS. This enables the server-side file system to be stateless, thus simplifying the recovery from a file server failure.
This figure from the chapter shows three different failure modes — network failure causing a request packet loss, server failure, and network failure causing a response (acknowledgement) packet loss. Idempotent operations offer a simple solution to handle either of these failures — retry the request if it has not been acknowledged as successfully completed.
The cache-consistency problem. The figure shows a timeline with one file server and three clients. The “File” originally contains some data which is represented by its red color. The color of the word “File” changing from red to purple shows that client A has updated the file data. However, when client B reads that file, it still gets the old file data because client A has cached its updates. This is referred to as the update-visibility problem. Additionally, even after client A flushes its cache and updates the file on the server, because client C had read and cached the file before this happened, it continues to read the old file data. This is referred to as the stale-cache problem.

--

--

--

Visit afterhoursacademic.com for summaries of computer science research papers.

Love podcasts or audiobooks? Learn on the go with our new app.

What are Pods in Kubernetes?

Exploring Akka’s Actors

Hello Dev

Start of an App

Zero downtime local build Laravel 5 deploys with Deployer

On Time, Time Zones, and Software

Firestore, No-SQL, Why?

5 aspects of a bad interview

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Rajat Kateja, After Hours Academic

Rajat Kateja, After Hours Academic

Visit afterhoursacademic.com for summaries of computer science research papers.

More from Medium

What is Application Maintenance?

Sentiment Analyis Using AWS

How to use Ballerina Local Repository