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https://issues.apache.org/jira/browse/CASSANDRA-9451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14724857#comment-14724857
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Stefania commented on CASSANDRA-9451:
-------------------------------------
Hi [~zstlaw], sorry for the delay.
Could you attach {{cqlsh_to_2_1_server.sh}} and specify which 2.2.0 version you
are reproducing the problem with?
What happens when I increase the protocol version in cqlsh is that the python
driver automatically downgrades it and everything works fine, on the latest
branches for 2.1 or 2.2.
So I tried connecting from a 2.2 cqlsh to a running 2.1 node and got:
{code}
Connection error: ('Unable to connect to any servers', {'127.0.0.1':
ProtocolError("cql_version '3.3.0' is not supported by remote (w/ native
protocol). Supported versions: [u'3.2.0']",)})
{code}
However {{./cqlsh --cqlversion=3.2.0}} works fine as the driver once again
downgrades the protocol version.
The driver downgrades the version only when receiving
{{ProtocolVersionUnsupported}}, which leads me to believe this patch is working
as expected.
I wonder if the 2.2.0 version you used was older than 2.2.0 rc1 or if I am
doing something wrong to reproduce this?
> Startup message response for unsupported protocol versions is incorrect
> -----------------------------------------------------------------------
>
> Key: CASSANDRA-9451
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9451
> Project: Cassandra
> Issue Type: Bug
> Environment: OS X 10.9
> Cassandra 2.1.5
> Reporter: Jorge Bay
> Assignee: Stefania
> Labels: client-impacting
> Fix For: 2.1.6, 2.2.0 rc1
>
> Attachments: 9451.txt
>
>
> The response to a STARTUP request with protocol v4 on a C* 2.1 host is an
> error with an incorrect error code (0).
> Instead of the error code being "Protocol error" ({{0x000A}}) it has error
> code 0 and message (wrapped by netty):
> {{"io.netty.handler.codec.DecoderException:
> org.apache.cassandra.transport.ProtocolException: Invalid or unsupported
> protocol version: 4"}}
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