[CASSANDRA-4180] Single-pass compaction for LCR

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.0 beta 1
• Labels: compaction
• Assignee: Jonathan Ellis
• Reporter: Sylvain Lebresne

Authors

Jonathan Ellis

Reviewers

Marcus Eriksson

• Created: 20/Apr/12 15:00
• Updated: 16/Apr/19 09:32
• Resolved: 07/May/13 19:22

Description

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.

Issue Links

• depends upon: CASSANDRA-4885 Remove or rework per-row bloom filters
• incorporates: CASSANDRA-5429 Update scrub and scrubtest for single-pass compaction format
• is depended upon by: CASSANDRA-5454 Changing column_index_size_in_kb on different nodes might corrupt files
• is duplicated by: CASSANDRA-6918 Compaction Assert: Incorrect Row Data Size