lidavidm edited a comment on pull request #12509:
URL: https://github.com/apache/arrow/pull/12509#issuecomment-1050175988
@ericl would you be able to build this and ensure it fixes your case too?
I tested with the following:
```diff
diff --git a/cpp/src/arrow/dataset/file_parquet.cc
b/cpp/src/arrow/dataset/file_parquet.cc
index cdee1f006..52de0ea11 100644
--- a/cpp/src/arrow/dataset/file_parquet.cc
+++ b/cpp/src/arrow/dataset/file_parquet.cc
@@ -17,6 +17,8 @@
#include "arrow/dataset/file_parquet.h"
+#include <chrono>
+#include <thread>
#include <memory>
#include <mutex>
#include <unordered_map>
@@ -561,6 +563,7 @@ Status
ParquetFileFragment::EnsureCompleteMetadata(parquet::arrow::FileReader* r
return EnsureCompleteMetadata(reader.get());
}
+ std::this_thread::sleep_for(std::chrono::seconds(1));
std::shared_ptr<Schema> schema;
RETURN_NOT_OK(reader->GetSchema(&schema));
if (physical_schema_ && !physical_schema_->Equals(*schema)) {
```
and
```python
from concurrent.futures import ThreadPoolExecutor
import time
import pyarrow as pa
import pyarrow.parquet as pq
dataset = pq.ParquetDataset([
"/home/lidavidm/Documents/ursa-labs-taxi-data/2009/03/data.parquet",
"/home/lidavidm/Documents/ursa-labs-taxi-data/2009/04/data.parquet",
], use_legacy_dataset=False)
print(dataset.fragments)
pool = ThreadPoolExecutor()
start = time.monotonic()
for x in pool.map(lambda x: x.metadata, dataset.fragments):
print(x)
end = time.monotonic()
print(end - start)
```
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