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Posted to user@avro.apache.org by Sam Groth <sg...@yahoo-inc.com> on 2015/11/03 16:02:59 UTC
Re: array of primitives: byte[]
Use a class the implements java.util.Collection. One example would be ArrayList<byte>.
Sam
On Tuesday, November 3, 2015 8:59 AM, "seemanto.barua@nomura.com" <se...@nomura.com> wrote:
<!--#yiv8669435112 _filtered #yiv8669435112 {font-family:SimSun;panose-1:2 1 6 0 3 1 1 1 1 1;} _filtered #yiv8669435112 {font-family:SimSun;panose-1:2 1 6 0 3 1 1 1 1 1;} _filtered #yiv8669435112 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv8669435112 {panose-1:2 1 6 0 3 1 1 1 1 1;}#yiv8669435112 #yiv8669435112 p.yiv8669435112MsoNormal, #yiv8669435112 li.yiv8669435112MsoNormal, #yiv8669435112 div.yiv8669435112MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", "sans-serif";}#yiv8669435112 a:link, #yiv8669435112 span.yiv8669435112MsoHyperlink {color:blue;text-decoration:underline;}#yiv8669435112 a:visited, #yiv8669435112 span.yiv8669435112MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv8669435112 pre {margin:0in;margin-bottom:.0001pt;font-size:10.0pt;font-family:"Courier New";}#yiv8669435112 span.yiv8669435112EmailStyle17 {font-family:"Calibri", "sans-serif";color:windowtext;}#yiv8669435112 span.yiv8669435112HTMLPreformattedChar {font-family:"Courier New";}#yiv8669435112 .yiv8669435112MsoChpDefault {} _filtered #yiv8669435112 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv8669435112 div.yiv8669435112WordSection1 {}-->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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