Python snappy error: "integer out of range for 'I' format code"
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Key: AVRO-892
URL: https://issues.apache.org/jira/browse/AVRO-892
Project: Avro
Issue Type: Bug
Components: python
Affects Versions: 1.5.4
Environment: Linux michaelc 2.6.38-11-generic #48-Ubuntu SMP Fri Jul
29 19:02:55 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
Ubuntu 11.04
Python 2.7.1+ (ubuntu stock version)
avro-1.5.4-py2.7.egg
snappy-1.0.4 (c library)
python-snappy-0.3.2
Reporter: Michael Cooper
The Python library for avro fails to write some blocks when used with snappy
compression.
The error is:
Traceback (most recent call last):
File "tools/json_to_avro.py", line 74, in <module>
writer.append(line)
File "/home/michaelc/.python/2.7/avro-1.5.4-py2.7.egg/avro/datafile.py", line
185, in append
self._write_block()
File "/home/michaelc/.python/2.7/avro-1.5.4-py2.7.egg/avro/datafile.py", line
169, in _write_block
self.encoder.write_crc32(uncompressed_data)
File "/home/michaelc/.python/2.7/avro-1.5.4-py2.7.egg/avro/io.py", line 364,
in write_crc32
self.write(STRUCT_CRC32.pack(crc32(bytes)));
struct.error: integer out of range for 'I' format code
>From my investigation, str(crc32(bytes)) is showing negative integers, so the
>issue seems to be fixed by masking the output.
This fix appears to work from my limited testing:
--- io.old.py 2011-09-21 14:32:38.992544680 +1000
+++ io.py 2011-09-21 14:33:11.492544686 +1000
@@ -360,7 +360,7 @@
"""
A 4-byte, big-endian CRC32 checksum
"""
- self.write(STRUCT_CRC32.pack(crc32(bytes)));
+ self.write(STRUCT_CRC32.pack(crc32(bytes) & 0xffffffff));
#
# DatumReader/Writer
--
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