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From "Andrey Konstantinov (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9794) Linearizable consistency for lightweight transactions is not achieved
Date Thu, 16 Jul 2015 05:55:05 GMT


Andrey Konstantinov commented on CASSANDRA-9794:

I have resolved all the issues. I have found how to use SERIAL consistency and addressed all
the issues. Details are here:

Thank you for your support. Could you, please, cancel the issue? I am not sure if I need to
click "Resolved" button or something else.

> Linearizable consistency for lightweight transactions is not achieved
> ---------------------------------------------------------------------
>                 Key: CASSANDRA-9794
>                 URL:
>             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, Cassandra.LocksTest_with_original_driver.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. It is necessary only for "persisted" and "embedded" modes. 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
> Thanks,
> Andrey

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