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https://issues.apache.org/jira/browse/CASSANDRA-10280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15023260#comment-15023260
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Lorina Poland commented on CASSANDRA-10280:
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To change Cassandra documentation for this JIRA, I need to know if the
following is correct. Could someone please verify?
C*3.1:
1. Change DEFAULT_MAX_SSTABLE_AGE_DAYS to 1000 days. The patch says 365*1000,
which is 365,000 days.
2. Deprecate MAX_SSTABLE_AGE_DAYS. Note that it is deprecated.
3. ADD DEFAULT_MAX_WINDOW_SIZE_SECONDS that is what size? The patch looks like
1 day in seconds, or 86,400, but perhaps I misunderstand.
> Make DTCS work well with old data
> ---------------------------------
>
> Key: CASSANDRA-10280
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10280
> Project: Cassandra
> Issue Type: Sub-task
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Fix For: 2.1.12, 2.2.4, 3.0.1, 3.1
>
>
> Operational tasks become incredibly expensive if you keep around a long
> timespan of data with DTCS - with default settings and 1 year of data, the
> oldest window covers about 180 days. Bootstrapping a node with vnodes with
> this data layout will force cassandra to compact very many sstables in this
> window.
> We should probably put a cap on how big the biggest windows can get. We could
> probably default this to something sane based on max_sstable_age (ie, say we
> can reasonably handle 1000 sstables per node, then we can calculate how big
> the windows should be to allow that)
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