T Jake Luciani created CASSANDRA-7272:
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Summary: 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
Priority: Minor
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.
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