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.

Author: Malashicage Moll
Country: United Arab Emirates
Language: English (Spanish)
Genre: History
Published (Last): 11 September 2015
Pages: 160
PDF File Size: 11.79 Mb
ePub File Size: 9.13 Mb
ISBN: 490-2-33392-946-8
Downloads: 53966
Price: Free* [*Free Regsitration Required]
Uploader: Goll

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.

ASDF: An Autonomous and Scalable Distributed File System – Semantic Scholar

But in other important ways ASDF demonstrates how these C systems have much accidental complexity that CL does away with thanks to better architecture. Thus you could get the same result as previously with: To use this website, you must agree to our Privacy Policyincluding cookie policy. For instance, Gary King, when newly made maintainer of ASDF 1, attempted to define some concept of preference files, so that users may customize how the build takes place, or fix some systems without modifying their source code.

The days of work poured into getting logical pathnames to work were probably not well spent. Failed Attempts at Improvement ; and the bug that required rewriting it all over again in Appendix F: Some implementations may try to emulate this feature on a regular Unix filesystem.

Indeed, this was a great success in making ASDF understandable, if not by newcomers, at least qnd the maintainer himself; On the other hand, a fild setup is now required for the debugger to locate the actual source code in ASDF ; but this price is only paid by ASDF maintainers.


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

As a side benefit, this wholly eliminated the previous need for kluges to avoid clock skew between the processor clock and the fileserver clock though not clock skew between multiple file distribted used during the build.

The problem could be even more aggravating, since a bug in the program itself could be causing a fatal error during compilation especially since in CL, developers can run arbitrary code during compilation.

You can also inject input and capture output: A portable solution involved using merge-pathnames inside a reader-evaluation idiom. And so Robert Goldman had fixed this bug in the lead-up to the ASDF 2 release, by correctly propagating the flag; except for many reasons, he had declined at the time to propagate it for systems, propagating it only for modules inside systems.

ASDF: An Autonomous and Scalable Distributed File System

By clicking accept or continuing to use the site, you agree to the terms outlined in our Privacy ZcalableTerms of Serviceand Dataset License. Behavior scalavle vary notably include: 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. And so, of course, since this was the “last” bug standing, and longstanding, I opened it Portability was achieved by following the principle that we must abstract away semantic discrepancies between underlying implementations.

The type may also be specified as: The functions defined by the CL standard do not recognize nil as valid input where a pathname is required. The division of ASDF into smaller, more intelligible pieces had been proposed shortly after we took over ASDF ; but we had rejected the proposal then on the basis that ASDF must not depend on external tools to upgrade itself zystem source, another strong requirement see Upgradability.

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

A number of schemes pertaining to QoS issues are critically analyzed to point out their strengths and weaknesses. For instance, the good old downward propagation was implemented by this mixin: ASDF always had minimal support for configuration management.


For compatibility with ancient operating systems without hierarchical filesystems, the directory component on some implementations can be just a string, which is then an: For instance, in a Google build system extension I wrote to support CL, visited files would be upgraded between being not needed in image, needed loaded as cfasl, needed loaded from source, or needed loaded from fasl.

A host component, which is often but not always nil on Unix implementations, or sometimes: Conversely, because some autlnomous do call component-depends-onthat function would have to call action-depends-on. Sagayaraj Francis ArXiv This is more expressive than what preceded, without requiring inconsistencies in the dependency model, and without pathological performance behavior.

However, after our then co-maintainer and now maintainer Robert Goldman insisted that run-shell-command was required for backward compatibility and some similar functionality expected by various ASDF extensions, we decided to provide the real thing rather than this nuisance, and moved from xcvb-driver the nearest code there was to this real thing, that we then extended to make it more portable, robust, etc. CL has an idiom merge-pathnames pathname defaults that ostensibly serves to merge a relative pathname with an absolute pathname.

Yet, when the resulting pathname is relative, it may result in the Unix operating system implicitly merging it with the result of getcwdaccording to its own rules different from those of CL. Of course, do-first would come back with a vengeance, see below Needed In Image.