Counters in super columns don't preserve correct values after cluster restart
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Key: CASSANDRA-3821
URL: https://issues.apache.org/jira/browse/CASSANDRA-3821
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 1.1
Environment: ubuntu, 'trunk' branch, used ccm to create a 3 node
cluster with rf=3. A dtest was created to demonstrate.
Reporter: Tyler Patterson
Set up a 3-node cluster with rf=3. Create a counter super column family and
increment a bunch of subcolumns 100 times each, with cf=QUORUM. Then wait a few
second, restart the cluster, and read the values back. They almost all come
back different (and higher) then they are supposed to be.
Here are some extra things I've noticed:
- Reading back the values before the restart always produces correct results.
- Doing a nodetool flush before killing the cluster greatly improves the
results, though sometimes a value will still be incorrect. You might have to
run the test several times to see an incorrect value after a flush.
- This problem doesn't happen on C* 1.0.7, unless you don't sleep between
doing the increments and killing the cluster. Then it sometimes happens to a
lesser degree.
The dtest that demonstrates this issue is called "super_counter_test.py". Run
it like this: nosetests --nocapture super_counter_test.py You'll need ccm from
[email protected]:tpatterson/ccm.git.
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