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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4778) leveled compaction does less work in L0 than intended
Date Wed, 10 Oct 2012 17:05:03 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473370#comment-13473370
] 

Jonathan Ellis commented on CASSANDRA-4778:
-------------------------------------------

Also added a fix in f34bd79b9a92f23c1fc5e185e074d7faa880fc0b to avoid infinite compaction
on a single L0 sstable that isn't large enough to promote.
                
> leveled compaction does less work in L0 than intended
> -----------------------------------------------------
>
>                 Key: CASSANDRA-4778
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4778
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.2
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>              Labels: compaction
>             Fix For: 1.1.6
>
>         Attachments: 4778.txt
>
>
> We have this code in the candidate loop:
> {code}
> .               if (SSTable.getTotalBytes(candidates) > maxSSTableSizeInBytes)
>                 {
>                     // add sstables from L1 that overlap candidates
>                     candidates.addAll(overlapping(candidates, generations[1]));
>                     break;
>                 }
> {code}
> thus, as soon as we have enough to compact to make one L1 sstable's worth of data, we
stop collecting candidates.

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