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From "Jeremiah Jordan (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-7953) RangeTombstones not merging during compaction
Date Tue, 01 Dec 2015 15:18:11 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeremiah Jordan resolved CASSANDRA-7953.
----------------------------------------
    Resolution: Fixed

> RangeTombstones not merging during compaction
> ---------------------------------------------
>
>                 Key: CASSANDRA-7953
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7953
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Cassandra 2.1
>            Reporter: Marcus Olsson
>            Assignee: Branimir Lambov
>            Priority: Critical
>              Labels: compaction, deletes, tombstone
>             Fix For: 2.1.12, 2.2.4
>
>         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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