From user-return-31686-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Wed Feb 6 10:53:04 2013 Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 33FDEE270 for ; Wed, 6 Feb 2013 10:53:04 +0000 (UTC) Received: (qmail 8887 invoked by uid 500); 6 Feb 2013 10:43:42 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 8383 invoked by uid 500); 6 Feb 2013 10:43:23 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 7511 invoked by uid 99); 6 Feb 2013 10:42:42 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 06 Feb 2013 10:42:41 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of some.unique.login@gmail.com designates 209.85.128.176 as permitted sender) Received: from [209.85.128.176] (HELO mail-ve0-f176.google.com) (209.85.128.176) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 06 Feb 2013 10:42:34 +0000 Received: by mail-ve0-f176.google.com with SMTP id cz10so1013076veb.35 for ; Wed, 06 Feb 2013 02:42:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:sender:date:x-google-sender-auth:message-id :subject:from:to:content-type:content-transfer-encoding; bh=7P4gga0PBMO0hSoO/nuUV0xm68dN7fWG4cZI833F/70=; b=xOBmiIlyzVRQicbVLw6Sy4uYg9itz5rUrMwRojrqerVEmjyEVvVvIdd/q8i+BOR+v6 PfFDE6hUAg4uGvuBegHeoHSTZ2ExnpOCoXHtjaedmuV/Te6WNGMBzzcyVng0pkVmhZ8S Rt1/wmjbWv0saX0XIS7aw8ZTOy2MNpLCh9clXGYAu/RwZ5qdE9nFU5kCku18lBSP72gb n/UWAk7Dk+d7ehsMQQoidw5WaCyGmpNngeD37w6ryac2KUhMyNUWZxdvNj27aW65RIxr VuKP+npOCsj+1lKTBUUCMZ2eugjIEVldSir32OLZ46agdaRN2ix3oaOFq/RK+kBbqwwT 6rGQ== MIME-Version: 1.0 X-Received: by 10.58.64.230 with SMTP id r6mr27944879ves.51.1360147333645; Wed, 06 Feb 2013 02:42:13 -0800 (PST) Sender: some.unique.login@gmail.com Received: by 10.220.193.133 with HTTP; Wed, 6 Feb 2013 02:42:13 -0800 (PST) Date: Wed, 6 Feb 2013 12:42:13 +0200 X-Google-Sender-Auth: epHErW__739Yz0SRG8KPj_qdR68 Message-ID: Subject: Estimating write throughput with LeveledCompactionStrategy From: =?KOI8-R?B?6ddhziBDz8JvzGXX?= To: user@cassandra.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Checked: Checked by ClamAV on apache.org Dear Community, Could anyone please give me a hand with understanding what am I missing while trying to model how LeveledCompactionStrategy works: https://docs.google.com/spreadsheet/ccc?key=3D0AvNacZ0w52BydDQ3N2ZPSks2OHR1= dlFmMVV4d1E2eEE#gid=3D0 Logs mostly contain something like this: INFO [CompactionExecutor:2235] 2013-02-06 02:32:29,758 CompactionTask.java (line 221) Compacted to [chunks-hf-285962-Data.db,chunks-hf-285963-Data.db,chunks-hf-285964-Data.db= ,chunks-hf-285965-Data.db,chunks-hf-285966-Data.db,chunks-hf-285967-Data.db= ,chunks-hf-285968-Data.db,chunks-hf-285969-Data.db,chunks-hf-285970-Data.db= ,chunks-hf-285971-Data.db,chunks-hf-285972-Data.db,chunks-hf-285973-Data.db= ,chunks-hf-285974-Data.db,chunks-hf-285975-Data.db,chunks-hf-285976-Data.db= ,chunks-hf-285977-Data.db,chunks-hf-285978-Data.db,chunks-hf-285979-Data.db= ,chunks-hf-285980-Data.db,]. 2,255,863,073 to 1,908,460,931 (~84% of original) bytes for 36,868 keys at 14.965795MB/s. Time: 121,614ms. Thus spreadsheet is parameterized with throughput being 15Mb and survivor ratio of 0.9. 1) Projected result actually differs from what I observe - what am I missin= g? 2) Are there any metrics on write throughput with LCS per node anyone could possibly share? Thank you very much in advance, Ivan