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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, 20 Nov 2015 08:33:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15015419#comment-15015419
] 

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

fixed the comments and also made sure the unit tests pass, test runs pending

||branch||testall||dtest||
|[marcuse-10280|https://github.com/krummas/cassandra/tree/marcuse-10280]|[testall|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-testall]|[dtest|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-dtest]|
|[marcuse-10280-2.2|https://github.com/krummas/cassandra/tree/marcuse-10280-2.2]|[testall|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-2.2-testall]|[dtest|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-2.2-dtest]|
|[marcuse-10280-3.0|https://github.com/krummas/cassandra/tree/marcuse-10280-3.0]|[testall|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-3.0-testall]|[dtest|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-3.0-dtest]|
|[marcuse-10280-3.1|https://github.com/krummas/cassandra/tree/marcuse-10280-3.1]|[testall|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-3.1-testall]|[dtest|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-3.1-dtest]|
|[marcuse-10280-trunk|https://github.com/krummas/cassandra/tree/marcuse-10280-trunk]|[testall|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-trunk-testall]|[dtest|http://cassci.datastax.com/view/Dev/view/krummas/job/krummas-marcuse-10280-trunk-dtest]|


> 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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