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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5182) Deletable rows are sometimes not removed during compaction
Date Wed, 23 Jan 2013 23:33:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561229#comment-13561229
] 

Yuki Morishita commented on CASSANDRA-5182:
-------------------------------------------

Maybe it is better to check if fp_chance is high before going through index file, since it
has performance penalty.
                
> 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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