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[jira] [Created] (ARROW-2633) Parquet file not accesible to write after first read using PyArrow


Suman created ARROW-2633:
----------------------------

             Summary: Parquet file not accesible to write after first read using PyArrow
                 Key: ARROW-2633
                 URL: https://issues.apache.org/jira/browse/ARROW-2633
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
            Reporter: Suman


 
I am trying to read a parquet file in pandas dataframe, do some manipulation and write it back in the same file, however it seems file is not accessible to write after the first read in same function.

It only works, if I don't perform STEP 1 below. Is there anyway to unlock the file as such?

{{#STEP 1: Read entire parquet file pq_file = pq.ParquetFile('\dev\abc.parquet') exp_df = pq_file.read(nthreads=1, use_pandas_metadata=True).to_pandas() #STEP 2:  # Change some data in dataframe #STEP 3: write merged dataframe pyarrow_table = pa.Table.from_pandas(exp_df) pq.write_table(pyarrow_table, '\dev\abc.parquet',compression='none',)}}

Error:

{{File "C:\Python36\lib\site-packages\pyarrow\parquet.py", line 943, in write_table **kwargs) File "C:\Python36\lib\site-packages\pyarrow\parquet.py", line 286, in __init__ **options) File "_parquet.pyx", line 832, in pyarrow._parquet.ParquetWriter.__cinit__ File "error.pxi", line 79, in pyarrow.lib.check_status pyarrow.lib.ArrowIOError: Failed to open local file: \dev\abc.parquet , error: Invalid argument}}



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