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https://issues.apache.org/jira/browse/CASSANDRA-16986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17420540#comment-17420540
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Benjamin Lerer commented on CASSANDRA-16986:
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+1 for the comments
> DROP Table should not recycle active CommitLog segments
> -------------------------------------------------------
>
> Key: CASSANDRA-16986
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16986
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Commit Log
> Reporter: Aleksandr Sorokoumov
> Assignee: Aleksandr Sorokoumov
> Priority: Normal
> Fix For: 4.x
>
>
> Right now, DROP TABLE recycles all active CL segments and explicitly marks
> intervals as clean for all dropping tables. I believe that this is not
> necessary.
> Recycling of CL segments was introduced in CASSANDRA-3578. Back then, it was
> necessary to recycle all active segments because:
> 1. CommitLog reused old segments after they were clean. This is no longer the
> case, I believe, since CASSANDRA-6809.
> 2. CommitLog segments must have been closed and recycled on {{DROP TABLE}} to
> avoid resurrecting data if a table with the same name is created. This was an
> issue because tables didn't have unique ids yet (CASSANDRA-5202).
> Given that {{DROP TABLE}} triggers flush, which in turn cleans CL intervals
> in Keyspace#unloadCF, I think that we can avoid the call to
> {{forceRecycleAll}} there.
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