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From Sam Groth <sgr...@yahoo-inc.com>
Subject Re: array of primitives: byte[]
Date Tue, 03 Nov 2015 15:02:59 GMT
Use a class the implements java.util.Collection. One example would be ArrayList<byte>.


     On Tuesday, November 3, 2015 8:59 AM, "seemanto.barua@nomura.com" <seemanto.barua@nomura.com>

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{}-->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.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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