[jira] [Created] (CASSANDRA-10280) Make DTCS work well with old data

["Marcus Eriksson (JIRA)" <ji...@apache.org>]

Marcus Eriksson created CASSANDRA-10280:
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             Summary: 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: 3.x, 2.1.x, 2.2.x


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 make calculate how big the windows should be to allow that)



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