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Date: Tue, 13 Oct 2015 21:32:06 +0000 (UTC)
From: "Alan Boudreault (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (CASSANDRA-10490) DTCS historic compaction,
 possibly with major compaction
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     [ https://issues.apache.org/jira/browse/CASSANDRA-10490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Boudreault updated CASSANDRA-10490:
----------------------------------------
    Labels: compaction triage  (was: compaction)

> DTCS historic compaction, possibly with major compaction
> --------------------------------------------------------
>
>                 Key: CASSANDRA-10490
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10490
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Shook
>              Labels: compaction, triage
>             Fix For: 3.x, 2.2.x
>
>
> Presently, it's simply painful to run a major compaction with DTCS. It doesn't really serve a useful purpose. Instead, a DTCS major compaction should allow for a DTCS-style compaction to go back before max_sstable_age_days. We can call this a historic compaction, for lack of a better term.
> Such a compaction should not take precedence over normal compaction work, but should be considered a background task. By default there should be a cap on the number of these tasks running. It would be nice to have a separate "max_historic_compaction_tasks" and possibly a "max_historic_compaction_throughput" in the compaction settings to allow for separate throttles on this. I would set these at 1 and 20% of the usual compaction throughput if they aren't set explicitly.
> It may also be desirable to allow historic compaction to run apart from running a major compaction, and to simply disable major compaction altogether for DTCS.


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