Return-Path: X-Original-To: apmail-cassandra-commits-archive@www.apache.org Delivered-To: apmail-cassandra-commits-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id B3555174CC for ; Thu, 8 Jan 2015 09:06:34 +0000 (UTC) Received: (qmail 47580 invoked by uid 500); 8 Jan 2015 09:06:35 -0000 Delivered-To: apmail-cassandra-commits-archive@cassandra.apache.org Received: (qmail 47546 invoked by uid 500); 8 Jan 2015 09:06:34 -0000 Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@cassandra.apache.org Delivered-To: mailing list commits@cassandra.apache.org Received: (qmail 47465 invoked by uid 99); 8 Jan 2015 09:06:34 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 08 Jan 2015 09:06:34 +0000 Date: Thu, 8 Jan 2015 09:06:34 +0000 (UTC) From: "Marcus Eriksson (JIRA)" To: commits@cassandra.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (CASSANDRA-7272) Add "Major" Compaction to LCS MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/CASSANDRA-7272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14269017#comment-14269017 ] Marcus Eriksson commented on CASSANDRA-7272: -------------------------------------------- [~yarin] doubt it, we only do bug fixes in 2.0 > Add "Major" Compaction to LCS > ------------------------------ > > Key: CASSANDRA-7272 > URL: https://issues.apache.org/jira/browse/CASSANDRA-7272 > Project: Cassandra > Issue Type: Improvement > Components: Core > Reporter: T Jake Luciani > Assignee: Marcus Eriksson > Priority: Minor > Labels: compaction > Fix For: 3.0 > > > LCS has a number of minor issues (maybe major depending on your perspective). > LCS is primarily used for wide rows so for instance when you repair data in LCS you end up with a copy of an entire repaired row in L0. Over time if you repair you end up with multiple copies of a row in L0 - L5. This can make predicting disk usage confusing. > Another issue is cleaning up tombstoned data. If a tombstone lives in level 1 and data for the cell lives in level 5 the data will not be reclaimed from disk until the tombstone reaches level 5. > I propose we add a "major" compaction for LCS that forces consolidation of data to level 5 to address these. -- This message was sent by Atlassian JIRA (v6.3.4#6332)