Hi,
How do I serialize an array of primitive type in avro. Is it allowed ?
The schema I have prepared is as below and ‘pnl’ is an array of bytes.
{
"type" : "record",
"name" : "tradeDim",
"fields" : [
{
"name" : "tradeId",
"type" : "int"
},
{
"name" : "pnl",
"type" : {
"type" : "array",
"items" : "byte"
}
} ]
}
DatumWriter<GenericRecord> datumWriter = new
GenericDatumWriter<GenericRecord>(avroSchema);
DataFileWriter dataFileWriter = new DataFileWriter<GenericRecord>(datumWriter);
byte arr[] = { 1,0,5,6,7,8,9 };
Trade tradeObj = new Trade(123, arr);
GenericRecord tradeObj = new GenericData.Record(avroSchema);
tradeObj.put("tradeId", trade.tradeId);
tradeObj.put("pnl", trade.pnl);
dataFileWriter.append(tradeObj);
dataFileWriter.close();
class Trade {
int tradeId;
byte[] pnl;
public Trade(int tradeId, byte[] pnl) { this.tradeId = tradeId; this.pnl =
pnl; }
}
The error message seems to indicate that it is expecting a collection.
org.apache.avro.file.DataFileWriter$AppendWriteException:
java.lang.ClassCastException: [B cannot be cast to java.util.Collection
-regards
Seemanto Barua
212.298.4097
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