gitzwz commented on issue #1479:
URL:
https://github.com/apache/iceberg-python/issues/1479#issuecomment-2567363410
The most time-consuming process is this :
```Python
for manifest_entry in chain(
*executor.map(
lambda args: _open_manifest(*args),
[
(
self.io,
manifest,
partition_evaluators[manifest.partition_spec_id],
metrics_evaluator,
)
for manifest in manifests
if self._check_sequence_number(min_sequence_number,
manifest)
],
)
):
...
```
For instance, consider a scenario with 6 manifest files, each containing
7,000 entries. With **max-workers=32**, the code spawns 6 threads, each
completing after approximately 30 seconds concurrently. In contrast, with
**max-workers=1**, the code processes the manifest files sequentially, yet
still finishes in roughly 30 seconds.
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