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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-5515) Track sstable coldness
Date Tue, 16 Jul 2013 18:42:50 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13710062#comment-13710062
] 

Jonathan Ellis edited comment on CASSANDRA-5515 at 7/16/13 6:40 PM:
--------------------------------------------------------------------

Just tracking the read counts for now, then we can build on top of it.  Which might be out
of scope for 2.0.x, but I don't expect that adding the tracking will be very invasive.  Still,
just having the information available will be useful.
                
      was (Author: jbellis):
    Just tracking the read counts for now, then we can build on top of it.  (Which might be
out of scope for 2.0.x, but I don't expect that adding the tracking will be very invasive.)
                  
> 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
>
>
> 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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