Shichao An created CASSANDRA-14349:
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Summary: Untracked CDC segment files are not deleted after replay
Key: CASSANDRA-14349
URL: https://issues.apache.org/jira/browse/CASSANDRA-14349
Project: Cassandra
Issue Type: Bug
Components: Local Write-Read Paths
Reporter: Shichao An
When CDC is enabled, a hard link to each commit log file will be created in
cdc_raw directory. Those commit logs with CDC mutations will also have cdc
index files created along with the hard links; these are intended for the
consumer to handle and clean them up.
However, if we don't produce any CDC traffic, those hard links in cdc_raw will
be never cleaned up (because hard links will still be created, without the
index files), whereas the real original commit logs are correctly deleted after
replay during process startup. This will results in many untracked hard links
in cdc_raw if we restart the cassandra process many times. I am able to use CCM
to reproduce it in trunk version which has the CASSANDRA-12148 changes.
This seems a bug in handleReplayedSegment of the commit log segment manager
which neglects to take care of CDC commit logs. I will attach a patch here.
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