[jira] [Closed] (ARROW-9958) Error writing record batches to IPC streaming format

["Kouhei Sutou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-9958?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kouhei Sutou closed ARROW-9958.
-------------------------------
    Resolution: Not A Problem

You need to ensure closing writers and output streams.

For {{example1.py}}:

{noformat}
sink = pa.output_stream(FILE, COMPRESSION_TYPE)
writer = pa.RecordBatchStreamWriter(sink, batch.schema)
for _ in range(5):
    writer.write_batch(batch)
writer.close()
sink.close()
{noformat}

For {{example2.py}}:

{noformat}
sink = pa.output_stream(FILE, COMPRESSION_TYPE)
writer = pa.RecordBatchStreamWriter(sink, batch.schema)
for _ in range(5):
    writer.write_batch(batch)
writer.close()
sink.close()
{noformat}

> Error writing record batches to IPC streaming format
> ----------------------------------------------------
>
>                 Key: ARROW-9958
>                 URL: https://issues.apache.org/jira/browse/ARROW-9958
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: GLib, Python
>    Affects Versions: 1.0.1
>         Environment: pyarrow - Version: 1.0.1
> python - version 3.7.6
> Operating system - CentOS Linux release 7.8.2003 (Core)
>            Reporter: Ishan
>            Priority: Major
>              Labels: Compression
>         Attachments: example1.py, example2.py
>
>
> Writing record batches to the Arrow IPC streaming format with on-the-fly compression generally raises errors of one type or the other when reading it back.
> PFA the code producing each of the below errors. I can't reproduce it for smaller batch sizes, so it probably has to do with size of each record batch. It does not seem specific to pyarrow since I see a similar issue with the C-Glib API. 
> #Error case 1
> ```
> ~/py376/lib/python3.7/site-packages/pyarrow/ipc.pxi in pyarrow.lib._CRecordBatchReader.read_next_batch()
> ~/py376/lib/python3.7/site-packages/pyarrow/error.pxi in pyarrow.lib.check_status()
> OSError: Truncated compressed stream
> ```
> #Error case 2
> ```
> ~/py376/lib/python3.7/site-packages/pyarrow/ipc.pxi in pyarrow.lib._RecordBatchStreamReader._open()
> ~/py376/lib/python3.7/site-packages/pyarrow/error.pxi in pyarrow.lib.pyarrow_internal_check_status()
> ~/py376/lib/python3.7/site-packages/pyarrow/error.pxi in pyarrow.lib.check_status()
> ArrowInvalid: Tried reading schema message, was null or length 0
> ```



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