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From "Jonathan Chambers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ARROW-723) Arrow freezes on write if chunk_size=0
Date Tue, 28 Mar 2017 11:45:41 GMT
Jonathan Chambers created ARROW-723:
---------------------------------------

             Summary: Arrow freezes on write if chunk_size=0
                 Key: ARROW-723
                 URL: https://issues.apache.org/jira/browse/ARROW-723
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.2.0
         Environment: Linux, macOS
            Reporter: Jonathan Chambers


Pyarrow freezes if you set chunk_size=0 (e.g. if you forget to account for short data when
setting chunk size as a function of table length, see example).

Would expect either to handle gracefully (e.g. revert to behaviour chunk_size=None) or to
throw error.

```
import numpy as np
import pandas as pd
import pyarrow as pa
import pyarrow.parquet as pq
cols = 'A', 'B', 'C', 'D'
row = np.arange(4)
data = pd.DataFrame([row], columns=cols)
table = pa.Table.from_pandas(data.reset_index(), timestamps_to_ms=True)
pq.write_table(table, 'test.pq', chunk_size=int(len(data) / 4))
```



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