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chore(dblab): revise issue solution after noticing it works removing just the branch

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Michele Cereda
2025-10-12 22:56:16 +02:00
parent cefa697f08
commit 41493d0e63
1 changed files with 14 additions and 11 deletions
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knowledge base/dblab engine.md
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@@ -355,7 +355,7 @@ sudo docker run --privileged --detach --restart on-failure \
--volume '/lib/modules:/lib/modules:ro' \
--volume '/proc:/host_proc:ro' \
--env 'DOCKER_API_VERSION=1.39' \
'postgresai/dblab-server:4.0.0'
'postgresai/dblab-server:4.0.1'
```
> [!important]
@@ -406,7 +406,7 @@ Error message example:
Root cause: still unknown.
Short term solution: manually delete the ZFS snapshots and restart the Engine.
_**Short-term**_ solution: manually delete the ZFS snapshots and restart the Engine.
<details>
@@ -421,7 +421,7 @@ Short term solution: manually delete the ZFS snapshots and restart the Engine.
dblab_pool_1@snapshot_20251002175419 87.5K - 145G -
```
1. Ensure no clone is using those snapshots.\
1. Ensure no clone is using those snapshots.<br/>
Reset those that do if necessary.
1. Destroy the chosen ZFS snapshots.
@@ -429,7 +429,7 @@ Short term solution: manually delete the ZFS snapshots and restart the Engine.
sudo zfs destroy 'dblab_pool_1@snapshot_20250923130042'
```
1. Restart the DBLab Engine's container.\
1. Restart the DBLab Engine's container.<br/>
Needed to make it recognize the snapshots are gone.
```sh
@@ -440,25 +440,28 @@ Short term solution: manually delete the ZFS snapshots and restart the Engine.
### The automatic full refresh fails claiming it cannot find available pools
Root cause: in version 4.0.0, the DBLab Engine happened to consider a pool used by clones, even if those clones were
destroyed.<br/>
This seems to have been solved in version 4.0.1.
Context: since version 4.0.0, when starting a full refresh, the operation fails with error _cannot find available
pools_.
Solution: remove all ZFS snapshots in the pool that should be used for the refresh and restart the Engine.
_**Apparent**_ root cause: the branching feature seems to consider a pool used by clones, even if those clones have
been destroyed.
_**Short-term**_ solution: **recursively** remove the branch's ZFS dataset from the pool that should be used for the
refresh, and restart the Engine.
<details>
1. Ensure no clone is using snapshots on the pool that should be used for the refresh.<br/>
Reset those that do if necessary.
1. Destroy all ZFS snapshots in the pool that should be used for the refresh.
1. Destroy the branch's ZFS dataset in the pool that should be used for the refresh.
```sh
sudo zfs list
sudo zfs destroy -rv 'dblab_pool_0/branch/main'
```
1. Restart the DBLab Engine's container.<br/>
Needed to make it recognize the pool as available.
1. Restart the DBLab Engine's containers.<br/>
This will make it recognize the pool as available.
```sh
sudo docker container restart 'dblab_server'