Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 73940 invoked from network); 5 May 2010 16:20:34 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 5 May 2010 16:20:34 -0000 Received: (qmail 66360 invoked by uid 500); 5 May 2010 16:20:33 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 66339 invoked by uid 500); 5 May 2010 16:20:33 -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 66331 invoked by uid 99); 5 May 2010 16:20:33 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 05 May 2010 16:20:33 +0000 X-ASF-Spam-Status: No, hits=2.3 required=10.0 tests=AWL,FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of schildmeijer@gmail.com designates 74.125.78.26 as permitted sender) Received: from [74.125.78.26] (HELO ey-out-2122.google.com) (74.125.78.26) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 05 May 2010 16:20:26 +0000 Received: by ey-out-2122.google.com with SMTP id 4so5439eyf.25 for ; Wed, 05 May 2010 09:20:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:mime-version :content-type:subject:date:in-reply-to:to:references:message-id :x-mailer; bh=kxZpj/PjmWzypaQAvvFul/R5+iBdJkZ+61b9vnhCTjo=; b=QAmzQQzYDomMESrKafXnKg4csgt8UAb1T+QYfThBH0ATeK+DR/WwKrDB0Rfg7oHmn+ GBU4KsnV0HqZqRsxBQBxAr7RX74TgvwrKZq26VNX/hdYXTEuFr1I2fnj9dWAQ64kmrco jNDBr2A8hLT0QFq8J5PjewX02DAD1LHt4ZsYY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:mime-version:content-type:subject:date:in-reply-to:to :references:message-id:x-mailer; b=m/g6UHmxLsMa7c9leh4ciSzIZLyctxeh9Ydg4mnfl67O+UPRBGoHA7oZI1l9zUsNTD Z2f+3LZTvykQB85PVOmNE+wWou2hWRv4KjBoev8dbUsw+fAzKnoRLmZrGrf16Pv7wl2f zB1CvLnNig+91orhwsEf4V3QtuIJCrxIZdDxE= Received: by 10.213.42.7 with SMTP id q7mr2710518ebe.47.1273076404518; Wed, 05 May 2010 09:20:04 -0700 (PDT) Received: from [192.168.0.123] (h55eb1f49.selukra.dyn.perspektivbredband.net [85.235.31.73]) by mx.google.com with ESMTPS id 14sm4502232ewy.14.2010.05.05.09.20.03 (version=TLSv1/SSLv3 cipher=RC4-MD5); Wed, 05 May 2010 09:20:03 -0700 (PDT) From: Roger Schildmeijer Mime-Version: 1.0 (Apple Message framework v1078) Content-Type: multipart/alternative; boundary=Apple-Mail-1-563942761 Subject: Re: Anti compaction and readonly compaction? Date: Wed, 5 May 2010 18:20:02 +0200 In-Reply-To: To: user@cassandra.apache.org References: Message-Id: <45917409-C1ED-4559-8D57-9CFFC367026B@gmail.com> X-Mailer: Apple Mail (2.1078) --Apple-Mail-1-563942761 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii http://wiki.apache.org/cassandra/Streaming On 5 maj 2010, at 18.18em, Weijun Li wrote: > What's the purpose of anti-compaction? In what scenario does Cassandra = need to split bit sstables into smaller piece? Also I noticed readonly = compaction in the code. What's the use of this compaction type? >=20 > Thanks, >=20 > -Weijun --Apple-Mail-1-563942761 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii

On 5 maj 2010, at 18.18em, Weijun Li wrote:

What's the purpose of anti-compaction? In what scenario does Cassandra need to split bit sstables into smaller piece? Also I noticed readonly compaction in the code. What's the use of this compaction type?

Thanks,

-Weijun

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