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Posted to user@cassandra.apache.org by Mark Furlong <mf...@ancestry.com> on 2017/09/11 23:29:53 UTC
Cassandra downgrade of 2.1.15 to 2.1.12
I have a requirement to test a downgrade of 2.1.15 to 2.1.12. Can someone please identify how to achieve this?
Thanks,
Mark Furlong
Sr. Database Administrator
mfurlong@ancestry.com<ma...@ancestry.com>
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O: 801-705-7115
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RE: Cassandra downgrade of 2.1.15 to 2.1.12
Posted by Mark Furlong <mf...@ancestry.com>.
Great information.
Thank you
Mark
801-705-7115 office
-----Original Message-----
From: Michael Shuler [mailto:mshuler@pbandjelly.org] On Behalf Of Michael Shuler
Sent: Monday, September 11, 2017 5:54 PM
To: user@cassandra.apache.org
Subject: Re: Cassandra downgrade of 2.1.15 to 2.1.12
On 09/11/2017 06:29 PM, Mark Furlong wrote:
> I have a requirement to test a downgrade of 2.1.15 to 2.1.12. Can
> someone please identify how to achieve this?
Downgrades have never been officially supported, but this is a relatively small step. Testing it out is definitely a good thing. Since protocols and on-disk sstable versions should be the same, I'd say work backwards through NEWS.txt and see what you think about how it affects your specific usage. I'd also be wary of the fixed bugs you will re-introduce on downgrade (CHANGES.txt).
https://github.com/apache/cassandra/blob/cassandra-2.1.15/NEWS.txt#L16-L44
https://github.com/apache/cassandra/blob/cassandra-2.1.15/CHANGES.txt#L1-L100
As for the actual software downgrade, it depends on install method.
`wget` the 2.1.12 tar or deb files and `tar -xzvf` or `dpkg -i` them.
Here's where you can find the old versions of artifacts:
tar:
http://archive.apache.org/dist/cassandra/2.1.12/
deb:
http://archive.apache.org/dist/cassandra/debian/pool/main/c/cassandra/
This definitely would not work on a major release downgrade like 2.2.x to 2.1.x, since the sstable versions would be different, but in your
2.1.15 to 2.1.12 example, this might "just work".
--
Kind regards,
Michael
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Re: Cassandra downgrade of 2.1.15 to 2.1.12
Posted by Michael Shuler <mi...@pbandjelly.org>.
On 09/11/2017 06:29 PM, Mark Furlong wrote:
> I have a requirement to test a downgrade of 2.1.15 to 2.1.12. Can
> someone please identify how to achieve this?
Downgrades have never been officially supported, but this is a
relatively small step. Testing it out is definitely a good thing. Since
protocols and on-disk sstable versions should be the same, I'd say work
backwards through NEWS.txt and see what you think about how it affects
your specific usage. I'd also be wary of the fixed bugs you will
re-introduce on downgrade (CHANGES.txt).
https://github.com/apache/cassandra/blob/cassandra-2.1.15/NEWS.txt#L16-L44
https://github.com/apache/cassandra/blob/cassandra-2.1.15/CHANGES.txt#L1-L100
As for the actual software downgrade, it depends on install method.
`wget` the 2.1.12 tar or deb files and `tar -xzvf` or `dpkg -i` them.
Here's where you can find the old versions of artifacts:
tar:
http://archive.apache.org/dist/cassandra/2.1.12/
deb:
http://archive.apache.org/dist/cassandra/debian/pool/main/c/cassandra/
This definitely would not work on a major release downgrade like 2.2.x
to 2.1.x, since the sstable versions would be different, but in your
2.1.15 to 2.1.12 example, this might "just work".
--
Kind regards,
Michael
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