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https://issues.apache.org/jira/browse/CASSANDRA-6270?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeremy Hanna updated CASSANDRA-6270:
------------------------------------
Labels: LWT (was: )
> SERIAL consistency in errors to v1 protocol driver
> --------------------------------------------------
>
> Key: CASSANDRA-6270
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6270
> Project: Cassandra
> Issue Type: Bug
> Environment: Cassandra 2.0
> Reporter: Theo Hultberg
> Assignee: Sylvain Lebresne
> Priority: Minor
> Labels: LWT
> Fix For: 2.0.3
>
> Attachments: 6270.txt
>
>
> I'm the author of the Ruby driver for CQL, and I got a bug report about
> strange errors when running on C* 2.0 and using lightweight transaction
> queries. The bug report can be found here:
> https://github.com/iconara/cql-rb/issues/53
> The client sent {{UPDATE table SET val = 42 WHERE row_id = 5 IF val = 41}}
> and when C* couldn't fulfill SERIAL consistency it sent an error back saying
> "Operation timed out - received only -1 responses".
> So far so good, but it also set the {{consistency}} field in the error
> response to 8, corresponding to {{SERIAL}} in v2 of the binary protocol, even
> if the communication with the client was over v1 of the protocol. Since my
> driver doesn't yet support v2 it doesn't think that 8 is a valid consistency,
> and fails to parse the frame.
> Is this the intended behaviour of C*, or an oversight in how that error is
> formulated? I could easily add {{SERIAL}} and accept it even if the
> communication is over v1 of the protocol, but the bigger issue is how C*
> handles drivers that do not speak the latest version of the protocol. People
> should be able to use a driver that worked correctly with C* X with C* X+1,
> right?
> Do drivers have to be accepting in what they receive from C* because they
> might get consistencies, data types, etc. that are from future versions of
> the protocol, or does C* guarantee that frames will conform to the protocol
> that the driver says it understands?
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