[CASSANDRA-12150] cqlsh does not automatically downgrade CQL version

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 3.10
• Component/s: Legacy/Tools
• Labels: cqlsh
• Assignee: Yusuke Takata
• Reporter: Yusuke Takata

Authors

Yusuke Takata

Reviewers

Stefania Alborghetti

• Created: 08/Jul/16 10:29
• Updated: 16/Apr/19 09:30
• Resolved: 13/Jul/16 02:06

Description

Cassandra drivers such as the Python driver can automatically connect a supported version,
but I found that cqlsh does not automatically downgrade CQL version as the following.

$ cqlsh
Connection error: ('Unable to connect to any servers', {'127.0.0.1': ProtocolError("cql_version '3.4.2' is not supported by remote (w/ native protocol). Supported versions: [u'3.4.0']",)})

I think that the function is useful for cqlsh too.
Could someone review the attached patch?

Issue Links

• duplicates: CASSANDRA-9467 cqlsh does not connect to older protocol versions
• is related to: CASSANDRA-13307 The specification of protocol version in cqlsh means the python driver doesn't automatically downgrade protocol version.