[jira] [Created] (CASSANDRA-7000) Assertion in SSTableReader during repair.

["Ben Chan (JIRA)" <ji...@apache.org>]

Ben Chan created CASSANDRA-7000:
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             Summary: Assertion in SSTableReader during repair.
                 Key: CASSANDRA-7000
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7000
             Project: Cassandra
          Issue Type: Bug
            Reporter: Ben Chan
         Attachments: sstablereader-assertion-bisect-helper, sstablereader-assertion.patch

I ran a {{git bisect run}} using the attached bisect script. Repro code:

{noformat}
# 5dfe241: trunk as of my git bisect run
# 345772d: empirically determined "good" commit.
git bisect start 5dfe241 345772d
git bisect run ./sstablereader-assertion-bisect-helper
{noformat}

The first failing commit is 5ebadc1 (first parent of {{refs/bisect/bad}}).

Prior to 5ebadc1, SSTableReader#close() never checked reference count. After 5ebadc1, there was an assertion for {{references.get() == 0}}. However, since the reference count is initialized to 1, a SSTableReader#close() was always guaranteed to either throw an AssertionError or to be a second call to SSTableReader#tidy() on the same SSTableReader.

The attached patch chooses an in-between behavior. It requires the reference count to match the initialization value of 1 for SSTableReader#close(), and the same behavior as 5ebadc1 otherwise.

This allows repair to finish successfully, but I'm not 100% certain what the desired behavior is for SSTableReader#close(). Should it close without regard to reference count, as it did pre-5ebadc1?




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