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December 15, 2015 20:41
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import avro.schema | |
from avro.datafile import DataFileReader, DataFileWriter | |
from avro.io import DatumReader, DatumWriter | |
import simplejson as json | |
a = avro.schema.parse(json.dumps({"name": "hey", "type": "record", "fields": [{"name":"n", "type":"double"}]})) | |
b = avro.schema.parse(json.dumps({"name": "hey", "type": "record", "fields": [{"name":"n", "type":"int"}]})) | |
c = avro.schema.parse(json.dumps({"name": "hey", "type": "record", "fields": [{"name":"n", "type":["int","double"]}]})) | |
writer = DataFileWriter(open("a.avro", "w"), DatumWriter(), a) | |
writer.append({"n": 1.0}) | |
writer.append({"n": 1}) | |
writer.close() | |
reader = DataFileReader(open("a.avro", "r"), DatumReader()) | |
print reader.next() # {u'n': 1.0} | |
print reader.next() # {u'n': 1.0} | |
reader = DataFileReader(open("a.avro", "r"), DatumReader(readers_schema=c)) | |
print reader.next() # {u'n': 1.0} | |
print reader.next() # {u'n': 1.0} | |
d = avro.schema.parse(json.dumps({"name": "hey", "type": "record", "fields": [{"name":"n", "type":["int", "double"]}]})) | |
writer = DataFileWriter(open("d.avro", "w"), DatumWriter(), d) | |
writer.append({"n": 1.0}) | |
writer.append({"n": 1}) | |
writer.close() | |
reader = DataFileReader(open("d.avro", "r"), DatumReader()) | |
print reader.next() # {u'n': 1.0} | |
print reader.next() # {u'n': 1.0} | |
reader = DataFileReader(open("d.avro", "r"), DatumReader(readers_schema=b)) | |
print reader.next() # error, schema doesn't matdh | |
print reader.next() # {u'n': 0} ??? | |
print reader.next() # {u'n': 0} ??? | |
reader = DataFileReader(open("d.avro", "r"), DatumReader(readers_schema=c)) | |
print reader.next() # {u'n': 1.0} | |
print reader.next() # {u'n': 1.0} |
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