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Posted to commits@cassandra.apache.org by "Yuki Morishita (JIRA)" <ji...@apache.org> on 2012/10/09 01:04:03 UTC
[jira] [Commented] (CASSANDRA-4778) leveled compaction does less
work in L0 than intended
[ https://issues.apache.org/jira/browse/CASSANDRA-4778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471947#comment-13471947 ]
Yuki Morishita commented on CASSANDRA-4778:
-------------------------------------------
+1
> 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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