[jira] [Created] (ARROW-6791) Memory Leak

["George Prichard (Jira)" <ji...@apache.org>]

George Prichard created ARROW-6791:
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             Summary: Memory Leak 
                 Key: ARROW-6791
                 URL: https://issues.apache.org/jira/browse/ARROW-6791
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.14.1, 0.14.0
         Environment: Ubuntu 18.04, 32GB ram, conda-forge installation
            Reporter: George Prichard


Memory leak with large string columns crashes the program. This only seems to affect 0.14.x  - it works fine for me in 0.13.0. It might be related to earlier similar issues? e.g. [https://github.com/apache/arrow/issues/2624]

Below is a reprex which works in earlier versions, but crashes on read (writing is fine) in this one. The real-life version of the data is full of URLs as the strings. 

Weirdly it crashes my 32GB Ubuntu 18.04, but runs (if very slowly for the read) on my 16GB Macbook. 

Thanks so much for the excellent tools! 

 

 
{code:java}
import pandas as pd
n_rows = int(1e6)
n_cols = 10
col_length = 100
df = pd.DataFrame()
for i in range(n_cols):
 df[f'col_{i}'] = pd.util.testing.rands_array(col_length, n_rows)
print('Generated df', df.shape)
filename = 'tmp.parquet'
print('Writing parquet')
df.to_parquet(filename)
print('Reading parquet')
pd.read_parquet(filename)
{code}
 

 

 

 

 



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