From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Original-To: caml-list@yquem.inria.fr Delivered-To: caml-list@yquem.inria.fr Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by yquem.inria.fr (Postfix) with ESMTP id CA075BBAF for ; Fri, 29 Oct 2010 02:47:22 +0200 (CEST) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AiIBACa2yUzU4366kGdsb2JhbACDDJBQjXkVAQEBAQkJDAcRAx+sSZF5AoEgdoI8dASHBYZW X-IronPort-AV: E=Sophos;i="4.58,255,1286143200"; d="scan'208";a="64524455" Received: from moutng.kundenserver.de ([212.227.126.186]) by mail3-smtp-sop.national.inria.fr with ESMTP; 29 Oct 2010 02:47:22 +0200 Received: from office1.lan.sumadev.de (dslb-188-097-002-186.pools.arcor-ip.net [188.97.2.186]) by mrelayeu.kundenserver.de (node=mrbap2) with ESMTP (Nemesis) id 0MRijR-1P102C1pF3-00TVDZ; Fri, 29 Oct 2010 02:47:21 +0200 Received: from [192.168.0.29] (dslb-084-058-062-241.pools.arcor-ip.net [84.58.62.241]) by office1.lan.sumadev.de (Postfix) with ESMTPA id EC7315F701; Fri, 29 Oct 2010 02:47:20 +0200 (CEST) Subject: [ANN] Plasma MapReduce, PlasmaFS, version 0.2 From: Gerd Stolpmann To: caml-list@inria.fr Cc: plasma-list@ocaml-programming.de Content-Type: text/plain; charset="UTF-8" Date: Fri, 29 Oct 2010 02:47:19 +0200 Message-ID: <1288313239.23893.133.camel@thinkpad> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Content-Transfer-Encoding: 7bit X-Provags-ID: V02:K0:umxQ1V4cQmriQ5ZqpmDLSCcqGtTwF90tew6Chx/yjfr lM2HweBTlzdqDqIANXEABan/Hsuwg2JGvI3xbC2jN7iJBfx4+2 oPD0s+zarWC2ZfZoGFf6jLrHAyDpHcbGtblIPKU70axNjQRWB3 Vc46SJ50oxQ3Y6F1G7dSFlUpqvXBBb2naOREUlUVIs9jwpl9o/ qBhb0rhnDSyfysXI29S4Q== X-Spam: no; 0.00; gerd:01 stolpmann:01 ocaml:01 command-line:01 chunks:01 bug:01 partitions:01 ocaml:01 implements:01 implements:01 gerd:01 stolpmann:01 darmstadt:01 6151:01 6151:01 Hi, I've just released Plasma-0.2. Plasma consists of two parts (for now), namely Plasma MapReduce, a map/reduce compute framework, and PlasmaFS, the underlying distributed filesystem. Major changes in version 0.2 : * Enhanced filesystem operations, with enhanced locking * Full support for symbolic links * Extended filesystem API, both in the ocaml module and the command-line utility * One can now mount filesystems read-write via NFS * Map/reduce processes files in larger chunks than before * Streaming (as in Hadoop) * Support for per-task logging Of course, there are also numerous bug fixes and performance improvements. Plasma MapReduce is a distributed implementation of the map/reduce algorithm scheme. In a sentence, map/reduce performs a parallel List.map on an input file, sorts and splits the output by some criterion into partitions, and runs a List.fold_left on each partition. Only that it does not do that sequentially, but in a distributed way, and chunk by chunk. Because of this Plasma MapReduce can process very large files, and if run on enough computers, this also will work in reasonable time. Of course, map and reduce are Ocaml functions here. This all works on top of a distributed filesystem, PlasmaFS. This is a user-space filesystem that is primarily accessed over RPC (but it is also mountable as NFS volume). Actually, most of the effort went here. PlasmaFS focuses on reliability and speed for big blocksizes. To get this, it implements ACID transactions, replicates data and metadata with two-phase commit, uses a shared memory data channel if possible, and monitors itself. Unlike other filesystems for map/reduce, PlasmaFS implements the complete set of usual file operations, including random reads and writes. It can also be used as unspecialized global filesystem. Both pieces of software are bundled together in one download. The project page with further links is http://projects.camlcity.org/projects/plasma.html This is an early alpha release (0.2). A lot of things work already, and you can already run distributed map/reduce jobs. However, it is in no way complete. Plasma is installable via GODI for Ocaml 3.12. For discussions on specifics of Plasma there is a separate mailing list: https://godirepo.camlcity.org/mailman/listinfo/plasma-list Gerd -- ------------------------------------------------------------ Gerd Stolpmann, Bad Nauheimer Str.3, 64289 Darmstadt,Germany gerd@gerd-stolpmann.de http://www.gerd-stolpmann.de Phone: +49-6151-153855 Fax: +49-6151-997714 ------------------------------------------------------------