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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6109) Consider coldness in STCS compaction
Date Tue, 22 Oct 2013 19:40:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802176#comment-13802176
] 

Jonathan Ellis commented on CASSANDRA-6109:
-------------------------------------------

bq. you're suggesting ignoring buckets?

No, I'm suggesting instead of {{getBuckets(sstables)}}, {{getBuckets(sstable for sstable in
sstables if recents_reads_from(sstable) > X)}}

> Consider coldness in STCS compaction
> ------------------------------------
>
>                 Key: CASSANDRA-6109
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6109
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Tyler Hobbs
>             Fix For: 2.0.2
>
>         Attachments: 6109-v1.patch, 6109-v2.patch
>
>
> I see two options:
> # Don't compact cold sstables at all
> # Compact cold sstables only if there is nothing more important to compact
> The latter is better if you have cold data that may become hot again...  but it's confusing
if you have a workload such that you can't keep up with *all* compaction, but you can keep
up with hot sstable.  (Compaction backlog stat becomes useless since we fall increasingly
behind.)



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