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Posted to dev@crunch.apache.org by "Jonathan Natkins (JIRA)" <ji...@apache.org> on 2012/12/11 22:27:21 UTC
[jira] [Created] (CRUNCH-129) AvroGroupedTableType is not
compatible with by()
Jonathan Natkins created CRUNCH-129:
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Summary: AvroGroupedTableType is not compatible with by()
Key: CRUNCH-129
URL: https://issues.apache.org/jira/browse/CRUNCH-129
Project: Crunch
Issue Type: Bug
Reporter: Jonathan Natkins
Given a simple Avro pipeline like this:
PGroupedTable<String, MyAvroObject> processedData = data.parallelDo(new DoFn<String, Pair<String, MyAvroObject>>() {
public void process(String line, Emitter<Pair<String, MyAvroObject>> emitter) {
String key = getKey(line);
MyAvroObject value = convertToAvroObject(line);
emitter.emit(Pair.of(key, value));
}
}, Avros.tableOf(Avros.strings(), Avros.specifics(MyAvroObject.class)))
.groupByKey(3);
PTable<MyAvroGroup, Pair<String, Iterable<MyAvroObject>>> groupedData =
processedData.by(new MapFn<Pair<String, Iterable<MyAvroObject>>, MyAvroGroup>() {
@Override
public MyAvroGroup map(Pair<String, Iterable<MyAvroObject>> input) {
MyAvroGroup group = new MyAvroGroup();
group.objects = Lists.<MyAvroObject>newArrayList();
for (MyAvroObject obj : input.second()) {
group.objects.add(obj);
}
return group;
}
},
Avros.specifics(MyAvroGroup.class));
An exception is thrown when the by() code is run:
12/12/10 14:11:07 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Exception in thread "main" java.lang.ClassCastException: org.apache.crunch.types.avro.AvroGroupedTableType cannot be cast to org.apache.crunch.types.avro.AvroType
at org.apache.crunch.types.avro.Avros.tableOf(Avros.java:608)
at org.apache.crunch.types.avro.AvroTypeFamily.tableOf(AvroTypeFamily.java:135)
at org.apache.crunch.impl.mem.collect.MemCollection.by(MemCollection.java:222)
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