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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-4180) Single-pass compaction for LCR
Date Tue, 07 May 2013 13:37:16 GMT


Jonathan Ellis commented on CASSANDRA-4180:

Pushed fixes to -6 branch.  Yes, scrub is expected to be totally broken at this point.
> Single-pass compaction for LCR
> ------------------------------
>                 Key: CASSANDRA-4180
>                 URL:
>             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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