Libing Sun created AVRO-1199:
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             Summary: SortedKeyValueFile$Writer.append method have a puzzle for 
the sorted key
                 Key: AVRO-1199
                 URL: https://issues.apache.org/jira/browse/AVRO-1199
             Project: Avro
          Issue Type: Bug
          Components: java
    Affects Versions: 1.7.3
            Reporter: Libing Sun


At the SortedKeyValueFile.java 539 lines like next:
mPreviousKey = key;

This class is same as Hadoop's MapFile, at the MapFile the same methon will 
keep a copy for this key, but not use "=".

If use "=" at here, when user append a reuse key object to this file. will 
cause key sorted not valid.

I think next code will fix it:

private DataInputBuffer inBuf = new DataInputBuffer();
private DataOutputBuffer outBuf = new DataOutputBuffer();

      GenericDatumWriter<K> writer = new ReflectDatumWriter<K>(schema);
      GenericDatumReader<K> reader = new ReflectDatumReader<K>(schema);
      writer.write(key, encoder);
      inBuf.reset(outBuf.getData(), outBuf.getLength());
      BinaryDecoder decoder = DecoderFactory.get().directBinaryDecoder(inBuf,
          null);
      lastKey = reader.read(null, decoder); 

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