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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5182) Deletable rows are sometimes not removed during compaction
Date Thu, 24 Jan 2013 00:03:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561257#comment-13561257
] 

Jonathan Ellis commented on CASSANDRA-5182:
-------------------------------------------

Do you want a performance issue, or do you only want to remove tombstones during major compaction?
:)
                
> Deletable rows are sometimes not removed during compaction
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-5182
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5182
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.5
>            Reporter: Binh Van Nguyen
>            Assignee: Yuki Morishita
>             Fix For: 1.1.10, 1.2.1
>
>         Attachments: 5182-1.1.txt, test_ttl.tar.gz
>
>
> Our use case is write heavy and read seldom.  To optimize the space used, we've set the
bloom_filter_fp_ratio=1.0  That along with the fact that each row is only written to one time
and that there are more than 20 SSTables keeps the rows from ever being compacted. Here is
the code:
> https://github.com/apache/cassandra/blob/cassandra-1.1/src/java/org/apache/cassandra/db/compaction/CompactionController.java#L162
> We hit this conner case and because of this C* keeps consuming more and more space on
disk while it should not.

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