You are viewing a plain text version of this content. The canonical link for it is here.

Posted to user@cassandra.apache.org by Paul Chandler <pa...@redshots.com> on 2021/04/28 16:24:25 UTC

Cassandra 4.0 and python

Hi all,

We have been testing with 4.0~beta2 in our setup for a few weeks and all has gone very smoothly, however when tried to install 4.0~rc1 we ran into problems with python versions.

We are on Ubuntu 16.04.7 LTS so use apt to install Cassandra, and this now gives the following error:

The following packages have unmet dependencies:
 cassandra : Depends: python3 (>= 3.6) but 3.5.1-3 is to be installed
E: Unable to correct problems, you have held broken packages.

Looking at the apt packaging the requirement for python has changed from 2.7 to 3.6 between beta4 and rc1. 

I have found https://issues.apache.org/jira/browse/CASSANDRA-16396 <https://issues.apache.org/jira/browse/CASSANDRA-16396> which says it needed to be python 3.6, however reading this ticket this seems to imply 2.7 is still supported https://issues.apache.org/jira/browse/CASSANDRA-15659 <https://issues.apache.org/jira/browse/CASSANDRA-15659>

Also the code for for cqlsh says it supports 2.7 as well:  https://github.com/apache/cassandra/blob/b0c50c10dbc443a05662b111a971a65cafa258d5/bin/cqlsh#L65 <https://github.com/apache/cassandra/blob/b0c50c10dbc443a05662b111a971a65cafa258d5/bin/cqlsh#L65>

All our clusters are currently on Ubuntu 16.04 which does not come with python 3.6, so this is going to be a major pain to upgrade them to 4.0.

Does the apt packaging really need to specify 3.6 ?

Thanks 

Paul Chandler

Re: Cassandra 4.0 and python

Posted by Paul Chandler <pa...@redshots.com>.

Thanks Kane,

If anyone else is interested in this, I created a Jira ticket : https://issues.apache.org/jira/browse/CASSANDRA-16641 <https://issues.apache.org/jira/browse/CASSANDRA-16641> but the response is that 3.6 is the minimum official supported version, although 2.7 still should work. This is why the Debian packaging was changed. 

Thanks 

Paul  



> On 29 Apr 2021, at 00:27, Kane Wilson <k...@raft.so> wrote:
> 
> No, I suspect the deb package dependencies haven't been updated correctly, as 2.7 should definitely still work. Could you raise a JIRA for this issue?
> 
> Not sure if apt has some way to force install/ignore dependencies, however if you do that it may work, otherwise your only workaround would be to install from the tarball.
> 
> raft.so <https://raft.so/> - Cassandra consulting, support, and managed services
> 
> 
> On Thu, Apr 29, 2021 at 2:24 AM Paul Chandler <paul@redshots.com <ma...@redshots.com>> wrote:
> Hi all,
> 
> We have been testing with 4.0~beta2 in our setup for a few weeks and all has gone very smoothly, however when tried to install 4.0~rc1 we ran into problems with python versions.
> 
> We are on Ubuntu 16.04.7 LTS so use apt to install Cassandra, and this now gives the following error:
> 
> The following packages have unmet dependencies:
>  cassandra : Depends: python3 (>= 3.6) but 3.5.1-3 is to be installed
> E: Unable to correct problems, you have held broken packages.
> 
> Looking at the apt packaging the requirement for python has changed from 2.7 to 3.6 between beta4 and rc1. 
> 
> I have found https://issues.apache.org/jira/browse/CASSANDRA-16396 <https://issues.apache.org/jira/browse/CASSANDRA-16396> which says it needed to be python 3.6, however reading this ticket this seems to imply 2.7 is still supported https://issues.apache.org/jira/browse/CASSANDRA-15659 <https://issues.apache.org/jira/browse/CASSANDRA-15659>
> 
> Also the code for for cqlsh says it supports 2.7 as well:  https://github.com/apache/cassandra/blob/b0c50c10dbc443a05662b111a971a65cafa258d5/bin/cqlsh#L65 <https://github.com/apache/cassandra/blob/b0c50c10dbc443a05662b111a971a65cafa258d5/bin/cqlsh#L65>
> 
> All our clusters are currently on Ubuntu 16.04 which does not come with python 3.6, so this is going to be a major pain to upgrade them to 4.0.
> 
> Does the apt packaging really need to specify 3.6 ?
> 
> Thanks 
> 
> Paul Chandler

Re: Cassandra 4.0 and python

Posted by Kane Wilson <k...@raft.so>.

No, I suspect the deb package dependencies haven't been updated
correctly, as 2.7 should definitely still work. Could you raise a JIRA for
this issue?

Not sure if apt has some way to force install/ignore dependencies, however
if you do that it may work, otherwise your only workaround would be to
install from the tarball.

raft.so - Cassandra consulting, support, and managed services


On Thu, Apr 29, 2021 at 2:24 AM Paul Chandler <pa...@redshots.com> wrote:

> Hi all,
>
> We have been testing with 4.0~beta2 in our setup for a few weeks and all
> has gone very smoothly, however when tried to install 4.0~rc1 we ran into
> problems with python versions.
>
> We are on Ubuntu 16.04.7 LTS so use apt to install Cassandra, and this now
> gives the following error:
>
> The following packages have unmet dependencies:
>  cassandra : Depends: python3 (>= 3.6) but 3.5.1-3 is to be installed
> E: Unable to correct problems, you have held broken packages.
>
> Looking at the apt packaging the requirement for python has changed from
> 2.7 to 3.6 between beta4 and rc1.
>
> I have found https://issues.apache.org/jira/browse/CASSANDRA-16396 which
> says it needed to be python 3.6, however reading this ticket this seems to
> imply 2.7 is still supported
> https://issues.apache.org/jira/browse/CASSANDRA-15659
>
> Also the code for for cqlsh says it supports 2.7 as well:
> https://github.com/apache/cassandra/blob/b0c50c10dbc443a05662b111a971a65cafa258d5/bin/cqlsh#L65
>
> All our clusters are currently on Ubuntu 16.04 which does not come with
> python 3.6, so this is going to be a major pain to upgrade them to 4.0.
>
> Does the apt packaging really need to specify 3.6 ?
>
> Thanks
>
> Paul Chandler
>