Andrey Konstantinov created CASSANDRA-9794:
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Summary: Linearizable consistency for lightweight transactions is
not achieved
Key: CASSANDRA-9794
URL: https://issues.apache.org/jira/browse/CASSANDRA-9794
Project: Cassandra
Issue Type: Bug
Components: Core
Environment: Client: windows, datastax C# driver, application attached
Server: single node, datastax community edition 2.1.7, ubuntu (but same happens
with datastax community windows)
Reporter: Andrey Konstantinov
Attachments: Cassandra.LocksTest.7z
I run into an issue with unexpected behavior of lightweight transactions. I am
not sure whether it is a Cassandra bug, C# driver bug or I am doing something
wrong. Please, help me to find the right direction.
I am attaching windows application and sources reproducing the following
issues.
1) INSERT IF NOT EXISTS returns TRUE, when a record has not been applied (run a
client in mode "local" or "persisted" and observe an exception)
2) INSERT IF NOT EXISTS returns FALSE, when a record has been applied (run a
client in mode "local" or "persisted" and observe hanged application)
3) The same issues with conditional UPDATE (run a client in mode "embedded" and
observe either an exception or hanged application)
4) SELECT with SERIAL consistency level does not return the latest record (run
a client in mode "persisted" or "embedded" and observe an exception about
mismatched counters)
The client sources have got comments pointing out to 4 problems, where, I
think, an error happens. The application can be run with 3 different modes
("local", "persisted", "embedded") trying the same thing from different
perspectives.
Note: I run into a problem with setting SERIAL consistency level for SELECT
queries using C# datastax driver. So, I patched it temporary. Diff file as well
as the compiled driver are placed within the application packages folder. It
would be great, if you could point me out if I am doing something wrong with
the driver API or if this issue should be reported to datastax.
Note: I am not sure if I followed all the rules submitting an issue, so,
please, adjust necessary fields. I am happy to submit more information, please,
let me know what I should check/do...
Thanks,
Andrew
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