Joel Knighton created CASSANDRA-11479:
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Summary: BatchlogManager unit tests failing on truncate race
condition
Key: CASSANDRA-11479
URL: https://issues.apache.org/jira/browse/CASSANDRA-11479
Project: Cassandra
Issue Type: Bug
Reporter: Joel Knighton
Example on CI
[here|http://cassci.datastax.com/job/trunk_testall/818/testReport/junit/org.apache.cassandra.batchlog/BatchlogManagerTest/testLegacyReplay_compression/].
This seems to have only started happening relatively recently (within the last
month or two).
As far as I can tell, this is only showing up on BatchlogManagerTests purely
because it is an aggressive user of truncate. The assertion is hit in the setUp
method, so it can happen before any of the test methods. The assertion occurs
because a compaction is happening when truncate wants to discard SSTables;
trace level logs suggest that this compaction is submitted after the pause on
the CompactionStrategyManager.
This should be reproducible by running BatchlogManagerTest in a loop - it takes
up to half an hour in my experience. A trace-level log from such a run is
attached - grep for my added log message "SSTABLES COMPACTING WHEN DISCARDING"
to find when the assert is hit.
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