[jira] [Commented] (CASSANDRA-2786) After a minor compaction, deleted key-slices are visible again

["rene kochen (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13154289#comment-13154289 ] 

rene kochen commented on CASSANDRA-2786:
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One note: I tested with several grace-periods. With a grace-period of one minute, it is easier to reproduce. On our production site (with grace-priod of 24 hours), the data resurrects after several days.
                
> After a minor compaction, deleted key-slices are visible again
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-2786
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2786
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.8.0, 0.8.7
>         Environment: Reproduced on single Cassandra node (CentOS 5.5)
> Reproduced on single Cassandra node (Windows Server 2008)
>            Reporter: rene kochen
>            Assignee: Sylvain Lebresne
>             Fix For: 0.8.1, 0.8.2
>
>         Attachments: 0001-Fix-wrong-purge-of-deleted-cf.patch, 2786_part2.patch, CassandraIssue.zip, CassandraIssueJava.zip
>
>
> After a minor compaction, deleted key-slices are visible again.
> Steps to reproduce:
> 1) Insert a row named "test".
> 2) Insert 500000 rows. During this step, row "test" is included in a major compaction:
>    file-1, file-2, file-3 and file-4 compacted to file-5 (includes "test").
> 3) Delete row named "test".
> 4) Insert 500000 rows. During this step, row "test" is included in a minor compaction:
>    file-6, file-7, file-8 and file-9 compacted to file-10 (should include tombstoned "test").
> After step 4, row "test" is live again.
> Test environment:
> Single node with empty database.
> Standard configured super-column-family (I see this behavior with several gc_grace settings (big and small values):
> create column family Customers with column_type = 'Super' and comparator = 'BytesType;
> In Cassandra 0.7.6 I observe the expected behavior, i.e. after step 4, the row is still deleted.
> I've included a .NET program to reproduce the problem. I will add a Java version later on.

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