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From "Chris Trahman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4396) Subcolumns not removed when compacting tombstoned super column
Date Sat, 07 Jul 2012 00:13:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408470#comment-13408470
] 

Chris Trahman commented on CASSANDRA-4396:
------------------------------------------

v2 is working here - thanks!
                
> Subcolumns not removed when compacting tombstoned super column
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-4396
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4396
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: Nick Bailey
>            Assignee: Jonathan Ellis
>            Priority: Minor
>              Labels: compaction
>             Fix For: 1.0.11, 1.1.3
>
>         Attachments: 4396-2.txt, 4396.txt
>
>
> When we compact a tombstone for a super column with the old data for that super column,
we end up writing the deleted super column and all the subcolumn data that is now worthless
to the new sstable. This is especially inefficient when reads need to scan tombstones during
a slice.
> Here is the output of a simple test I ran to confirm:
> insert supercolumn, then flush
> {noformat}
> Nicks-MacBook-Pro:12:20:52 cassandra-1.0] cassandra$ bin/sstable2json ~/.ccm/1node/node1/data/Keyspace2/Super4-hd-1-Data.db

> {
> "6b657931": {"supercol1": {"deletedAt": -9223372036854775808, "subColumns": [["737562636f6c31","7468697320697320612074657374",1340990212532000]]}}
> }
> {noformat}
> delete supercolumn, flush again
> {noformat}
> [Nicks-MacBook-Pro:12:20:59 cassandra-1.0] cassandra$ bin/nodetool -h localhost flush
> [Nicks-MacBook-Pro:12:22:41 cassandra-1.0] cassandra$ bin/sstable2json ~/.ccm/1node/node1/data/Keyspace2/Super4-hd-2-Data.db

> {
> "6b657931": {"supercol1": {"deletedAt": 1340990544005000, "subColumns": []}}
> }
> {noformat}
> compact and check resulting sstable
> {noformat}
> [Nicks-MacBook-Pro:12:22:55 cassandra-1.0] cassandra$ bin/nodetool -h localhost compact

> [Nicks-MacBook-Pro:12:23:09 cassandra-1.0] cassandra$ bin/sstable2json ~/.ccm/1node/node1/data/Keyspace2/Super4-hd-3-Data.db

> {
> "6b657931": {"supercol1": {"deletedAt": 1340990544005000, "subColumns": [["737562636f6c31","7468697320697320612074657374",1340990212532000]]}}
> }
> [Nicks-MacBook-Pro:12:23:20 cassandra-1.0] cassandra$ 
> {noformat}

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