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Posted to issues@iceberg.apache.org by "Gurnek (via GitHub)" <gi...@apache.org> on 2026/02/19 14:15:12 UTC
[I] Snapshot rollback doesn't work [iceberg-python]
Gurnek opened a new issue, #3068:
URL: https://github.com/apache/iceberg-python/issues/3068
### Apache Iceberg version
None
### Please describe the bug 🐞
Hello, I have encountered an issue with the rollback functionality. I have my data in a Glue catalog, and I am running the following code in some form:
```
tbl = catalog.load_table('db.table')
print(tbl.metdata.current_snapshot_id)
tbl.manage_snapshots().rollback_to_snapshot(123).commit() # 123 in this case would be a snapshot id that I know is an ancestor
print(tbl.metadata.current_snapshot_id) # will print the same thing as before
```
The table will still read from the same snapshot, however if I try to call `rollback_to_snapshot(123)` again, it will give the error `snapshot 123 is not an ancestor of current state: 123`.
Any help would be appreciated
### Willingness to contribute
- [ ] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from the Iceberg community
- [x] I cannot contribute a fix for this bug at this time
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Re: [I] Snapshot rollback doesn't work [iceberg-python]
Posted by "geruh (via GitHub)" <gi...@apache.org>.
geruh commented on issue #3068:
URL: https://github.com/apache/iceberg-python/issues/3068#issuecomment-3929429155
Hey @Gurnek, thanks for raising.
I tested this against my glue catalog with the 0.11.0 release and haven't been able to reproduce. Could you share some more information to help repo because maybe I'm missing something.
For context I'm running this:
```python
catalog = GlueCatalog('glue', **{'warehouse': 's3://<bucket>/warehouse/'})
schema = Schema(
NestedField(1, 'id', IntegerType(), required=False),
NestedField(2, 'data', StringType()),
)
catalog.create_namespace_if_not_exists("db")
tbl = catalog.create_table('db.test_tbl', schema=schema)
for i in range(3):
tbl.append(pa.table({'id': pa.array([i], type=pa.int32()), 'name': [f'data-{i}']}))
snapshots = tbl.snapshots()
target = snapshots[0].snapshot_id # <-- old snapshot
print(f'Before: {tbl.metadata.current_snapshot_id}')
tbl.manage_snapshots().rollback_to_snapshot(target).commit()
print(f'After: {tbl.metadata.current_snapshot_id}')
```
Which then prints:
```bash
Before: 6672913416757656702
After: 2295944502128096469
```
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Re: [I] Snapshot rollback doesn't work [iceberg-python]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #3068:
URL: https://github.com/apache/iceberg-python/issues/3068#issuecomment-5335849808
This issue has been automatically marked as stale because it has been open for 180 days with no activity. It will be closed in next 14 days if no further activity occurs. To permanently prevent this issue from being considered stale, add the label 'not-stale', but commenting on the issue is preferred when possible.
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Re: [I] Snapshot rollback doesn't work [iceberg-python]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed issue #3068: Snapshot rollback doesn't work
URL: https://github.com/apache/iceberg-python/issues/3068
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Re: [I] Snapshot rollback doesn't work [iceberg-python]
Posted by "Gurnek (via GitHub)" <gi...@apache.org>.
Gurnek commented on issue #3068:
URL: https://github.com/apache/iceberg-python/issues/3068#issuecomment-3929752402
Ok, I was investigate the specific error I was getting as well, about the ancestor, and looking at my snapshot list for the table, all of my snapshots have a `parent_snapshot_id` of `None` which means they will fail the ancestor lookup. I'm not sure why all of the parents are gone or why I was able to call the rollback function once initially but I'm not convinced its a bug with the library anymore. Thank you
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Re: [I] Snapshot rollback doesn't work [iceberg-python]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #3068:
URL: https://github.com/apache/iceberg-python/issues/3068#issuecomment-5502509686
This issue has been closed because it has not received any activity in the last 14 days since being marked as 'stale'
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