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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-13258) Rethink read-time defragmentation introduced in 1.1 (CASSANDRA-2503)
Date Tue, 28 Feb 2017 14:35:45 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-13258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Joshua McKenzie updated CASSANDRA-13258:
----------------------------------------
    Issue Type: Improvement  (was: Task)

> Rethink read-time defragmentation introduced in 1.1 (CASSANDRA-2503)
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-13258
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13258
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Nate McCall
>
> tl,dr; we issue a Mutation(!) on a read when using STCS and there are more than minCompactedThreshold
SSTables encountered by the iterator. (See org/apache/cassandra/db/SinglePartitionReadCommand.java:782)
> I can see a couple of use cases where this *might* be useful, but from a practical stand
point, this is an excellent way to exacerbate compaction falling behind.
> With the introduction of other, purpose built compaction strategies, I would be interested
to hear why anyone would consider this still a good idea. Note that we only do it for STCS
so at best, we are inconsistent. 
> There are some interesting comments on CASSANDRA-10342 regarding this as well.



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