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Date: Wed, 1 May 2013 16:00:18 +0000 (UTC)
From: "Jonathan Ellis (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12551799.1334934036284.255056.1367424018517@arcas>
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Subject: [jira] [Updated] (CASSANDRA-4180) Single-pass compaction for LCR
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     [ https://issues.apache.org/jira/browse/CASSANDRA-4180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-4180:
--------------------------------------

    Reviewer: krummas  (was: jasobrown)

Rebased again, to https://github.com/jbellis/cassandra/commits/4180-5.  [~krummas], can you review?
                
> Single-pass compaction for LCR
> ------------------------------
>
>                 Key: CASSANDRA-4180
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4180
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Assignee: Jonathan Ellis
>              Labels: compaction
>             Fix For: 2.0
>
>         Attachments: scrub-error.txt
>
>
> LazilyCompactedRow reads all data twice to compact a row which is obviously inefficient. The main reason we do that is to compute the row header. However, CASSANDRA-2319 have removed the main part of that row header. What remains is the size in bytes and the number of columns, but it should be relatively simple to remove those, which would then remove the need for the two-phase compaction.

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