Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id 41082200D15 for ; Thu, 5 Oct 2017 22:09:19 +0200 (CEST) Received: by cust-asf.ponee.io (Postfix) id 401521609E2; Thu, 5 Oct 2017 20:09:19 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id 855A11609D2 for ; Thu, 5 Oct 2017 22:09:18 +0200 (CEST) Received: (qmail 51632 invoked by uid 500); 5 Oct 2017 20:09:16 -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 51622 invoked by uid 99); 5 Oct 2017 20:09:16 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd1-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 05 Oct 2017 20:09:16 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd1-us-west.apache.org (ASF Mail Server at spamd1-us-west.apache.org) with ESMTP id DCD2DCEBBD for ; Thu, 5 Oct 2017 20:09:15 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd1-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 2.479 X-Spam-Level: ** X-Spam-Status: No, score=2.479 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=2, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_SORBS_SPAM=0.5, SPF_PASS=-0.001] autolearn=disabled Authentication-Results: spamd1-us-west.apache.org (amavisd-new); dkim=pass (2048-bit key) header.d=turnitin-com.20150623.gappssmtp.com Received: from mx1-lw-eu.apache.org ([10.40.0.8]) by localhost (spamd1-us-west.apache.org [10.40.0.7]) (amavisd-new, port 10024) with ESMTP id 3M6pPXCwqpuf for ; Thu, 5 Oct 2017 20:09:14 +0000 (UTC) Received: from mail-oi0-f46.google.com (mail-oi0-f46.google.com [209.85.218.46]) by mx1-lw-eu.apache.org (ASF Mail Server at mx1-lw-eu.apache.org) with ESMTPS id 228475FB2F for ; Thu, 5 Oct 2017 20:09:14 +0000 (UTC) Received: by mail-oi0-f46.google.com with SMTP id v132so7089601oie.1 for ; Thu, 05 Oct 2017 13:09:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=turnitin-com.20150623.gappssmtp.com; s=20150623; h=mime-version:from:date:message-id:subject:to; bh=63KEEi1TjxELFB7LSDCvh50dDGjjJwwmu+bDxtoyx+s=; b=SZb0PBCDvKniKaJeVoPDsBZxEziEWauGLZRNi3d+UKJCqAu6wBOZWZVwkAi9o40aTp UL+Fu4N+wx+OmXekvkNRiRtF5qpQmNHYtu2gsIqrJ3UsldSyBhQsc+XebEUNp4qaMlfs PgyCfgzzFFp5fH2k5+jtdUchNnfNRb+f0HB/yefuk1xe/smiomVYqnnFHOHCKi5e0YI4 lsaYNnFnPOW76r1VaO+pEQ+vCggxLWyopbNaXhDsZr3OU2w6TnJ7H76Xr2MMUR3iGQj9 zh02mXCGRy/uFqk4QfKpJes5N42d7C4nDFagpHRRnYIUsRHFi9ow1+tyKbMR/rfmgZy5 XZ6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=63KEEi1TjxELFB7LSDCvh50dDGjjJwwmu+bDxtoyx+s=; b=CDDg1l//HichC7QEV6FSlhUC44NNr6CqQXUyZIYBNs43TVFsJxpNBJ4q6T27la2aZt 999Pjphb+3b8RprmwnD03e1JYedW6eWA4kisYVHgi/gE45I8F1KfD/nWOpvJUPT3oTo7 XOfa9G19TeBZRiPCsmXynK+xLGGPoXmZw+HGXau2hoPEIiLhG1aBW7HoYQ43ogtG3BVh xvZbMYM7CbmHaVA1fIiTcBcVo7CehQiICYoTF0qVaYClg1C5hh2CA/2Plw9hmxOwGRNN bltCviYJgDdr5mZbOmMXUEjUMN5RlPBHEO85MOAp+JZ47d4cghe5tlWufFDIyPeOhuml Q3iQ== X-Gm-Message-State: AMCzsaWZLhasoXjA6N3FeDVN6nsEFXb4ScAWnU3QRP4meArlIKjstlcB D7O22loZLrXKJK++Yz++Zz6wHDokpQpWo56Ws5726XkW X-Google-Smtp-Source: AOwi7QBgBRXXHySIMh9IpeS6hTbM8mKNAzg7tuqL11Cq7Oi9UynuEeUpt/TJBh0dItsmfBCNELXAPkuayW48Dey5Lzo= X-Received: by 10.157.30.230 with SMTP id n93mr10285635otn.138.1507234152363; Thu, 05 Oct 2017 13:09:12 -0700 (PDT) MIME-Version: 1.0 Received: by 10.202.84.21 with HTTP; Thu, 5 Oct 2017 13:08:51 -0700 (PDT) From: Dan Kinder Date: Thu, 5 Oct 2017 13:08:51 -0700 Message-ID: Subject: LCS major compaction on 3.2+ on JBOD To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary="001a11433d243edcd8055ad24cff" archived-at: Thu, 05 Oct 2017 20:09:19 -0000 --001a11433d243edcd8055ad24cff Content-Type: text/plain; charset="UTF-8" Hi I am wondering how major compaction behaves for a table using LCS on JBOD with Cassandra 3.2+'s JBOD improvements. Up to then I know that major compaction would use a single thread, include all SSTables in a single compaction, and spit out a bunch of SSTables in appropriate levels. Does 3.2+ do 1 compaction per disk, since they are separate leveled structures? Or does it do a single compaction task that writes SSTables to the appropriate disk by key range? -dan --001a11433d243edcd8055ad24cff Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi

I am wondering how= major compaction behaves for a table using LCS on JBOD with Cassandra 3.2+= 's JBOD improvements.

Up to then I know that m= ajor compaction would use a single thread, include all SSTables in a single= compaction, and spit out a bunch of SSTables in appropriate levels.
<= div>
Does 3.2+ do 1 compaction per disk, since they are separ= ate leveled structures? Or does it do a single compaction task that writes = SSTables to the appropriate disk by key range?

-da= n
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