A agree with all of it. It all makes perfect sense and will get us in a
better position to move forward successfully.
As an architect, I hate things that affect my SLA, so the downtime will
be difficult and expensive. Anything that can be done to keep that
downtime to the shortest number of seconds possible would be a great
place to put some focus.
As the guy hanging out on IRC, I have no problem telling people that
they'll need downtime for this upgrade. If you could figure out some way
to put safeguards that prevent people from breaking their production
cluster because they didn't read the release notes (happens frequently),
that would be much appreciated.
On 10/06/2015 10:32 PM, Atin Mukherjee wrote:
Hi All,
Over the course of the design discussion, we got a chance to discuss
about the upgrades and backward compatibility strategy for Gluster 4.0
and here is what we came up with:
1. 4.0 cluster would be separate from 3.x clusters. Heterogeneous
support won't be available.
2. All CLI interfaces exposed in 3.x would continue to work with 4.x.
3. ReSTful APIs for all old & new management actions.
4. Upgrade path from 3.x to 4.x would be necessary. We need not support
rolling upgrades, however all data layouts from 3.x would need to be
honored. Our upgrade path from 3.x to 4.x should not be cumbersome.
Initiative wise upgrades strategy details:
GlusterD 2.0
------------
- No rolling upgrade, service disruption is expected
- Smooth upgrade from 3.x to 4.x (migration script)
- Rollback - If upgrade fails, revert back to 3.x, old configuration
data shouldn't be wiped off.
DHT 2.0
-------
- No in place upgrade to DHT2
- Needs migration of data
- Backward compat, hence does not exist
NSR
---
- volume migration from AFR to NSR is possible with an offline upgrade
We would like to hear from the community about your opinion on this
strategy.
Thanks,
Atin
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