Benedict created CASSANDRA-8513:
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Summary: SSTableScanner may not acquire reference, but will still
release it when closed
Key: CASSANDRA-8513
URL: https://issues.apache.org/jira/browse/CASSANDRA-8513
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Benedict
Fix For: 2.1.3
getRangeSlice and related methods do not require a reference to perform a safe
read, so during one it is possible for SSTableScanner to fail to acquire a
reference to the table it's being created on. In this case it doesn't fail, but
it also doesn't log that no reference was acquired; on close, it still releases
the reference that it never held.
We can fix this one of two ways: we can tell the scanner if we require a
reference to be acquired; or we can track if one was obtained. The former is a
bit more invasive but probably better, since we probably care if we fail to
grab one in cases where we need it, and probably don't want to grab one
otherwise.
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