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https://issues.apache.org/jira/browse/CASSANDRA-5395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-5395:
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Attachment: 5395-2.txt
second patch attached (on top of the first) that also avoids creating duplicate
index entries during PrecompactedRow.merge. (Calling indexer.update(A, B)
would remove the entry for A and add one for B, but since we're compacting we
know that an entry for B already exists.)
switched to a merge-column-at-a-time approach similar to what LCR uses.
also tweaked LCR's reducer to short-circuit the column lookup if there is no
index involved.
> Compaction doesn't remove index entries as designed
> ---------------------------------------------------
>
> Key: CASSANDRA-5395
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5395
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.2.0
> Reporter: Jonathan Ellis
> Priority: Minor
> Fix For: 1.2.4
>
> Attachments: 5395-2.txt, 5395.txt
>
>
> PerColumnIndexUpdater ignores updates where the new value is a tombstone. It
> should still remove the index entry on oldColumn.
> (Note that this will not affect user-visible correctness, since
> KeysSearcher/CompositeSearcher will issue deletes against stale index
> entries, but having more stale entries than we "should" could affect
> performance.)
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