ASDF: An Autonomous and Scalable Distributed File System . many of the same goals as previous distributed file systems such as scalability. Distributed File System (DFS) could be a set of consumer and server .. Huang and Huan-Ming Liang, “ASDF: An Autonomous and Scalable Distributed. File. 3 / Abstract. We have simulated SimpleFS, a simple and scalable distributed file system for nowadays highly Other file systems, like TidyFS, ASDF, Ceph, etc, utilize similar concepts but take more .. ASDF: An Autonomous and. Scalable.

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Byhowever, Unicode was ubiquitous, UTF-8 was a de facto standard, and Emacs supported it well. This is in sharp contrast with other “scripting” languages, that autonomou to slowly interpret or recompile everytime.

An explicit nil is often needed in the first few files of a system, before the usual function was defined. The process of building software is modeled as a Directed Acyclic Graph DAG of action s, where each action is a pair of an operation a a component.

These build systems allowed users to define systemsunits of software development made of many filesthemselves often grouped into modules ; many operations were available to transform those systems and files, mainly to compile the files and to load them, but also to extract and print documentation, to create an archive, issue hot patches, etc.

学术圈 – Reclaiming Space from Duplicate Files in a Serverless Distributed File System

As for do-first dependencies such as loading a file, we would stamp a load-op not with the time at which the file was loaded, but with the timestamp of the file being loaded. ASDF looks up systems by name: By the time of ASDF 2. A logical pathname is a way to specify a pathname under a virtual “logical host” that can be configured independently from the physical pathname where the file is actually stored on a machine. Dan extracted a raw design from the mud of conceptual chaos, and gave birth to ASDF.


Now everything was much cleaner. Indeed this happened when ASDF 3 tried to better support secondary systems.

dblp: Chi-Chang Huang

In many ways, this provides anr convenient abstraction, that smoothes out the discrepancies between implementations and between operating systems. POIUin addition to the dependencies propagated by ASDFwas also having each node in the action graph depend on the dependencies of each of its transitive parents. This arguably mattered more in when ASDF was first released and was about a thousand lines long: BrandtEthan L.

Most implementations actually accept a preserved mix of lowercase and uppercase letters without mapping them all to uppercase. On good implementations, these notably do a better job than the vanilla CL functions at handling wildcard characters. Feedback Privacy Policy Feedback. For instance, you can specify an optional type suffix in a way that is added to the provided stem rather than “merged” in the style of make-pathname or merge-pathnames ; thus parse-unix-namestring “foo-V1.

The potential growth in this area and the presence of some dominant organizations with abundant resources like Google, Amazon, Salesforce, Rackspace, Azure, GoGridmake the field of cloud computing more fascinating.

The idea was that extensions could then make use of this data without having to explicitly define storage for it.

For instance, if module A depends-on B, and B is flagged for re ristributed, then all the children of A need to be flagged, too. Bundle operations make delivery of code much easier.

Among the elided elements were metadata such as: Cloud computing — Issues, research and implementations Mladen A. However, several technical and functional e. The default recycle list consists in a list of the package and its nicknames.

It was made available separately from ASDF as a portability library to be used on its own; yet since ASDF still needed to be delivered as a single file asdf.


The DAG defines a partial order, whereby each action must be perform ed, but only after all the actions it transitively depends-on have already been performed. You can also use cl-launch as a script “interpreter”, except that it invokes a Lisp compiler underneath: This default changed to: The price usually paid in awkwardness of the development process in C is vastly larger than the price paid to cope with this bug in CL.

In C, the many utilities that need a DSL must grow it onerously from scratch; since the domain expert is seldom also a language expert with resources to do it right, this means plenty of mutually incompatible, misdesigned, power-starved, misimplemented languages that have to be combined through an unprincipled chaos of expensive yet inexpressive means of communication.

1 Ceph Distributed Storage Sage Weil DreamHost / new dream network April 7, 2011.

ASDF 3 gets rid of: For scalanle, we found that component-depends-on was a complete misnomer, and should have been action-depends-on or something similar. However, these could conceivably be implemented as ASDF extensions. This is a case of “negative inheritance”, a technique usually frowned upon, for the explicit purpose of backward compatibility.

One might be tempted to weaken the constraint a bit, and define “backward compatible” as being the same as a “conservative extension”: ASDF 3 thus solves this version extraction problem for all software — except itself, since its own version has to be readable by ASDF 2 as well as by who views the single delivery file; thus its version information is maintained by a management script using regexps, of course written in CL.