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From "Tyler Hobbs (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-5515) Track sstable coldness
Date Fri, 27 Sep 2013 17:51:06 GMT


Tyler Hobbs updated CASSANDRA-5515:

    Attachment: 5515-2.0-v2.txt

5515-2.0-v2.txt moves the row clearing to SSTableDeletingTask, increments reads in CollationController,
and uses Keyspace.SYSTEM_KS.

With regards to restoring from snapshots, I think the actual restore procedure might be somewhat
complicated and of relatively little benefit compare to the current patch.  Mind if we move
that to another ticket?
> Track sstable coldness
> ----------------------
>                 Key: CASSANDRA-5515
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Tyler Hobbs
>             Fix For: 2.0.2
>         Attachments: 0001-Track-row-read-counts-in-SSTR.patch, 5515-2.0-v1.txt, 5515-2.0-v2.txt
> 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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