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https://issues.apache.org/jira/browse/CASSANDRA-16508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Semb Wever updated CASSANDRA-16508:
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Since Version: 4.0-beta5
> Running cqlsh against cassandra 3 throws error about beta flag not set
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-16508
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16508
> Project: Cassandra
> Issue Type: Bug
> Components: CQL/Interpreter
> Reporter: Jeff Widman
> Assignee: Adam Holmberg
> Priority: Normal
> Fix For: 4.0-rc
>
>
> I just ran `cqlsh` from `trunk` commit
> 2aa22ba99dcc1dacb07b7af31b2664e7db839063 against a Cassandra 3.11.10 docker
> image.
> I expected that the newer cqlsh would down-negotiate from the v5 protocol to
> the older v4 protocol.
> Instead, I was surprised to get a server error about a beta protocol being
> used without `BETA_FLAG` being set. I unfortunately had to reboot my
> computer, so I lost the traceback but I can easily reproduce if needed.
> I think what's happening is that this commit promoted v5 out of beta:
> https://github.com/apache/cassandra/commit/c9d6c725dd0b4aa5693eb1c6d2221c28e9e99c6e#diff-9e4fe0cfd28004625a8006be8a0bdeab8cbdfb039449fb9501b15e8952577aaaL479
> And then when it tries to contact the older cassandra version, the server
> complains that it received a request using the v5 protocol without this beta
> flag being set.
> However, I was expecting that cqlsh would catch the error and down-negotiate
> to v4. Instead, it simply returns the error with no message about how to
> solve. As someone relatively new to `cqlsh`, I assumed at first there was no
> workaround except for downgrading my version of `cqlsh`. After some googling,
> I stumbled across a stackoverflow pointing toward the `--cqlversion` flag.
> Given that this was the first cqlsh to support python 3, it means that anyone
> trying to use python 3 for cqlsh against cassandra 3.x will hit this weird
> error. There is no alternative if you want to use python 3.
> My suggested fix is to catch the error and either prompt the user with
> something like _Perhaps you want to manually specify a different cql protocol
> version using the `--cqlversion` flag?_ or simply auto-down negotiate to
> version 4 (although I understand why auto-down-negotiating may not be the
> right move).
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