[jira] [Commented] (AVRO-1440) the problem of resolving schema

["haibin weng (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-1440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14633552#comment-14633552 ] 

haibin weng commented on AVRO-1440:
-----------------------------------

[~nivance] any similar way on avro schema content to match the effect of annotation @AvroIgnore on Java ?

> the  problem  of resolving schema 
> ----------------------------------
>
>                 Key: AVRO-1440
>                 URL: https://issues.apache.org/jira/browse/AVRO-1440
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.7.5
>         Environment: jdk1.7.0_45
>            Reporter: nivance
>              Labels: patch
>
> In Apache Avro™ 1.7.5 Documentation, have a sentence like this:
> {quote}Since both client and server both have the other's full schema, correspondence between same named fields, missing fields, extra fields, etc. can all be easily resolved.{quote}
> *But if client has two fields and server has three fields, the server can't resolve.*
> *Client avsc:*
> {"type":"record",
> "name":"UserLess",
> "namespace":"com.joyveb.test.bean",
> "fields":[{"name":"name","type":"string"},{"name":"favoritenumber","type":"int"}]}
> *serialize codes:*
> ByteArrayOutputStream bao = new ByteArrayOutputStream();
> GenericDatumWriter<Object> w = new GenericDatumWriter<Object>(userLess.getSchema());
> Encoder e = EncoderFactory.get().binaryEncoder(bao, null);
> w.write(object, e);
> e.flush();
> ByteBuffer.wrap(bao.toByteArray());
> *Server avsc:*
> {"type":"record",
> "name":"UserMore",
> "namespace":"com.joyveb.test.bean",
> "fields":[{"name":"name","type":"string"},{"name":"favoritenumber","type":"int"},{"name":"favoritecolor","type":"string"}]}
> *deserialize codes:*
> BinaryDecoder in = DecoderFactory.get().binaryDecoder(bytes, null);
> Object result = new GenericDatumReader<Object>(userMore.getSchema()).read(null, in);
> *After run the program, following exception comes out.*
> Exception in thread "main" java.io.EOFException
> 	at org.apache.avro.io.BinaryDecoder.ensureBounds(BinaryDecoder.java:473)
> 	at org.apache.avro.io.BinaryDecoder.readInt(BinaryDecoder.java:128)
> 	at org.apache.avro.io.BinaryDecoder.readString(BinaryDecoder.java:259)
> 	at org.apache.avro.io.ValidatingDecoder.readString(ValidatingDecoder.java:107)
> 	at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:363)
> 	at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:355)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:157)
> 	at org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:193)
> 	at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:183)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:151)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
> 	at com.joyveb.dbpapi.AvroByteUtil.deserialize(AvroByteUtil.java:81)
> 	at com.joyveb.dbpapi.test.avro.SchemaByteTest.less2more(SchemaByteTest.java:34)
> 	at com.joyveb.dbpapi.test.avro.SchemaByteTest.main(SchemaByteTest.java:15)



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