我已经编写了解码cookie并返回字符串列表的UDF。 不幸的是我得到了蜂巢运行时错误在处理Hive UDF - Java String castexception
这里是我的代码:
@Override
public ObjectInspector initialize(ObjectInspector[] input) throws UDFArgumentException {
ObjectInspector cookieContent = input[0];
if (!(isStringOI(cookieContent))){
throw new UDFArgumentException("only string");
}
this.cookieValue = (StringObjectInspector) cookieContent;
return ObjectInspectorFactory.getStandardListObjectInspector
(PrimitiveObjectInspectorFactory.javaStringObjectInspector);
}
public Object evaluate(DeferredObject[] input) throws HiveException {
String encoded = cookieValue.getPrimitiveJavaObject(input[0].get());
try {
result = decode(encoded);
} catch (CodeException e) {
throw new UDFArgumentException();
}
return result;
}
public List<String> decode(String encoded) throws CodeException {
decodedBase64 = Base64.decodeBase64(encoded);
String decompressedArray = new String(getKadrs(decodedBase64));
String kadr= decompressedArray.substring(decompressedArray.indexOf("|") + 1);
List<String> kadrsList= new ArrayList(Arrays.asList(kadr.split(",")));
return kadrsList;
}
private byte[] getKadrs(byte[] compressed) throws CodeException {
Inflater decompressor = new Inflater();
decompressor.setInput(compressed);
ByteArrayOutputStream outPutStream = new ByteArrayOutputStream(compressed.length);
byte temp [] = new byte[1024];
while (!decompressor.finished()) {
try {
int count = decompressor.inflate(temp);
outPutStream.write(temp, 0, count);
}
catch (DataFormatException e) {
throw new CodeException ("Wrong data format", e);
}
}
try {
outPutStream.close();
} catch (IOException e) {
throw new CodeException ("Cant close outPutStream ", e);
}
return outPutStream.toByteArray();
}
它的结果是,让说:
“kadr1,kadr20,kadr35,kadr12”。单元测试工作得很好,但是当我试图在蜂巢使用这个功能我得到这个:
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.hadoop.io.Text
at org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableStringObjectInspector.getPrimitiveWritableObject(WritableStringObjectInspector.java:41)
其对我来说很难调试引起其他人必须执行我的jar看到的结果,因此,所有意见将不胜感激。
我怀疑输入[0]获得()返回文本和您要转换为字符串 –
@ravindra - 我认为你已经倒退了,因为错误说不能转换为文本。 –
是的。你是对的。这是我的错误。 –