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https://issues.apache.org/jira/browse/CASSANDRA-11106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-11106:
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Component/s: Compaction
> Experiment with strategies for picking compaction candidates in LCS
> -------------------------------------------------------------------
>
> Key: CASSANDRA-11106
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11106
> Project: Cassandra
> Issue Type: Improvement
> Components: Compaction
> Reporter: Marcus Eriksson
> Assignee: Dikang Gu
> Priority: Major
> Labels: lcs
> Fix For: 4.x
>
>
> Ideas taken here: http://rocksdb.org/blog/2921/compaction_pri/
> Current strategy in LCS is that we keep track of the token that was last
> compacted and then we start a compaction with the sstable containing the next
> token (kOldestSmallestSeqFirst in the blog post above)
> The rocksdb blog post above introduces a few ideas how this could be improved:
> * pick the 'coldest' sstable (sstable with the oldest max timestamp) - we
> want to keep the hot data (recently updated) in the lower levels to avoid
> write amplification
> * pick the sstable with the highest tombstone ratio, we want to get
> tombstones to the top level as quickly as possible.
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