Nate McCall created CASSANDRA-13258:
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Summary: Rethink read-time defragmentation introduced in 1.0
(CASSANDRA-2503)
Key: CASSANDRA-13258
URL: https://issues.apache.org/jira/browse/CASSANDRA-13258
Project: Cassandra
Issue Type: Bug
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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