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https://issues.apache.org/jira/browse/CASSANDRA-3678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-3678.
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Resolution: Fixed
> New Pluggable Compaction to handle Capped Rows / Super Columns
> --------------------------------------------------------------
>
> Key: CASSANDRA-3678
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3678
> Project: Cassandra
> Issue Type: New Feature
> Components: API, Contrib, Core
> Environment: ALL
> Reporter: Praveen Baratam
> Labels: features
> Original Estimate: 672h
> Remaining Estimate: 672h
>
> Now that Pluggable Compaction is released, its feasible to implement a
> CompactionStrategy that handles Capped (Limited in size) Rows or SuperColumns
> in a ColumnFamily. This feature was requested many times on mailing lists by
> many people including me.
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Use-Case-scenario-Keeping-a-window-of-data-online-analytics-td4694907.html
> The above thread was quoted in Cassandra - Use Cases too.
> Reading and interpreting many conversations over this issue, I could infer
> that it was discussed in two flavors.
> 1. Enforcing Max Columns per Row/SC
> 2. Sliding Time Window
> Many a times MEMTABLE/SSTABLE approach of Cassandra is quoted as a limiting
> factor for an amicable implementation. In my perspective the above mentioned
> SSTABLE approach could mean some trade-offs and clever engineering but its
> still doable.
> This feature is not intended to offer a drop-in replacement for specialized
> tools like RRDTool, jRobin, etc. but to decrease the overhead of retro
> fitting such functionality into CASSANDRA and finding an approach that
> achieves the principal purpose of discarding obsolete data and stretching
> only as far as necessary.
> This ticket is to discuss ideas and implementation details of such compaction
> strategy.
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