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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10280) Make DTCS work well with old data
Date Fri, 13 Nov 2015 10:25:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15003823#comment-15003823
] 

Marcus Eriksson commented on CASSANDRA-10280:
---------------------------------------------

pushed a new commit to https://github.com/krummas/cassandra/commits/marcuse/10280 which deprecates
max_sstable_age and defaults it to 1000 years

> 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.x, 2.2.x, 3.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 calculate how big the windows should be to allow that)



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