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https://issues.apache.org/jira/browse/CASSANDRA-7953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14962992#comment-14962992
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Sylvain Lebresne commented on CASSANDRA-7953:
---------------------------------------------
Depends what you mean by "all these concerns". The ticket itself does affect
CQL, but the concern about the patch to fix accumulating too much RTs in memory
shouldn't indeed be a problem for deletions done through CQL.
> RangeTombstones not merging during compaction
> ---------------------------------------------
>
> Key: CASSANDRA-7953
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7953
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Cassandra 2.1
> Reporter: Marcus Olsson
> Assignee: Branimir Lambov
> Priority: Minor
> Labels: compaction, deletes, tombstone
> Fix For: 2.2.4, 2.1.12
>
> Attachments: 0001-7953-v2.patch, CASSANDRA-7953-1.patch,
> CASSANDRA-7953.patch
>
>
> When performing a compaction on two sstables that contain the same
> RangeTombstone with different timestamps, the tombstones are not merged in
> the new sstable.
> This has been tested using cassandra 2.1 with the following table:
> {code}
> CREATE TABLE test(
> key text,
> column text,
> data text,
> PRIMARY KEY(key, column)
> );
> {code}
> And then doing the following:
> {code}
> INSERT INTO test (key, column, data) VALUES ("1", "1", "1"); // If the
> sstable only contains tombstones during compaction it seems that the sstable
> either gets removed or isn't created (but that could probably be a separate
> JIRA issue).
> INSERT INTO test (key, column, data) VALUES ("1", "2", "2"); // The inserts
> are not actually needed, since the deletes create tombstones either way.
> DELETE FROM test WHERE key="1" AND column="2";
> nodetool flush
> INSERT INTO test (key, column, data) VALUES ("1", "2", "2");
> DELETE FROM test WHERE key="1" AND column="2";
> nodetool flush
> nodetool compact
> {code}
> When checking with the SSTableExport tool two tombstones exists in the
> compacted sstable. This can be repeated, resulting in more and more
> tombstones.
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