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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-5182) Deletable rows are sometimes not removed during compaction
Date Wed, 06 Feb 2013 15:17:13 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yuki Morishita updated CASSANDRA-5182:
--------------------------------------

    Attachment: 5182-1.2.txt

Patch attached for 1.2 and above. It checks index file using getPosition if sstable has AlwaysPresentFilter
as a bloom filter.
                
> 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: 1.0.7
>            Reporter: Binh Van Nguyen
>            Assignee: Yuki Morishita
>             Fix For: 1.2.2
>
>         Attachments: 5182-1.1.txt, 5182-1.2.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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