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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5515) Track sstable coldness
Date Thu, 01 Aug 2013 19:15:49 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726770#comment-13726770
] 

Jonathan Ellis commented on CASSANDRA-5515:
-------------------------------------------

Fair enough.  Initially I only really care about supporting CASSANDRA-5519 and compaction
making better decisions.
                
> Track sstable coldness
> ----------------------
>
>                 Key: CASSANDRA-5515
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5515
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Tyler Hobbs
>             Fix For: 2.0.1
>
>         Attachments: 0001-Track-row-read-counts-in-SSTR.patch
>
>
> Keeping a count of reads per-sstable would allow STCS to automatically ignore cold data
rather than recompacting it constantly with hot data, dramatically reducing compaction load
for typical time series applications and others with time-correlated access patterns.  We
would not need a separate age-tiered compaction strategy.
> (This will really be useful in conjunction with CASSANDRA-5514.)

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