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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-4180) Single-pass compaction for LCR
Date Fri, 12 Apr 2013 22:50:16 GMT


Jonathan Ellis commented on CASSANDRA-4180:

Pushed updated code to  Besides the rebase,
this cleans things up by making ColumnIndex the sole entity responsible for writing the row
header (thus removing the flag I'd added to it in the earlier version).
> 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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