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https://issues.apache.org/jira/browse/ARROW-1996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-1996:
--------------------------------
    Fix Version/s:     (was: 0.9.0)
                   0.10.0

> [Python] pyarrow.read_serialized cannot read concatenated records
> -----------------------------------------------------------------
>
>                 Key: ARROW-1996
>                 URL: https://issues.apache.org/jira/browse/ARROW-1996
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.8.0
>         Environment: Linux
>            Reporter: Richard Shin
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.10.0
>
>
> The following code
> {quote}import pyarrow as pa
> f = pa.OSFile('arrow_test', 'w')
>  pa.serialize_to(12, f)
>  pa.serialize_to(23, f)
>  f.close()
> f = pa.OSFile('arrow_test', 'r')
>  print(pa.read_serialized(f).deserialize())
>  print(pa.read_serialized(f).deserialize())
>  f.close()
> {quote}
> gives the following result:
> {quote}$ python pyarrow_test.py
>  First: 12
>  Traceback (most recent call last):
>  File "pyarrow_test.py", line 10, in <module>
>  print('Second: {}'.format(pa.read_serialized(f).deserialize()))
>  File "pyarrow/serialization.pxi", line 347, in pyarrow.lib.read_serialized 
> (/arrow/python/build/temp.linux-x86_64-2.7/lib.cxx:79159)
>  File "pyarrow/error.pxi", line 77, in pyarrow.lib.check_status 
> (/arrow/python/build/temp.linux-x86_64-2.7/lib.cxx:8270)
>  pyarrow.lib.ArrowInvalid: Expected schema message in stream, was null or 
> length 0
> {quote}
> I would have expected read_serialized to sucessfully read the second value.



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