Hadoop 使用MRUnit进行ORC映射器单元测试

我有一个处理ORC文件的地图程序。从驱动程序中，我将ORC格式设置为输入格式

job.setInputFormatClass(OrcNewInputFormat.class); 

在OrcNewInputFormat中，值为OrcStruct。在映射方法中，可写的值作为参数（value param）传递，它的类型转换为映射内的OrcStruct，如下所示

OrcStruct record = (OrcStruct) value

我想用MRUnit测试这个映射器。为此，在单元测试的设置方法中，我在testFilePath中创建了一个ORC文件

 OrcFile.createWriter(testFilePath,  OrcFile.writerOptions(conf).inspector(inspector).stripeSize(100000).bufferSize(10000).version(OrcFile.Version.V_0_12));
writer.addRow(new SimpleStruct("k1", "v1")) ;

public static class SimpleStruct {
    Text k;
    Text string1;

    SimpleStruct(String b1, String s1) {
        this.k = new Text(b1);
        if (s1 == null) {
            this.string1 = null;
        } else {
            this.string1 = new Text(s1);
        }
    }
}

然后在测试方法中，我阅读了它并使用mrunitinvokemapper。下面是代码

// Read orc file
Reader reader = OrcFile.createReader(fs, testFilePath) ;  
RecordReader recordRdr = reader.rows() ;
OrcStruct row = null ;
List<OrcStruct> mapData = new ArrayList<>()

while(recordRdr.hasNext()) { 
    row = (OrcStruct) recordRdr.next(row) ;
    mapData.add(row) ; 
}

// test mapper
initializeSerde(mapDriver.getConfiguration());

Writable writable = getWritable(mapData.get(0))  ; // test 1st record's mapper processing
mapDriver.withCacheFile(strCachePath).withInput(NullWritable.get(), writable );
mapDriver.runTest(); 

查看orcserde，我可以看到MRUnit调用的write不受支持。因此，测试用例错误被排除

我们如何对正在处理Orc文件的映射器进行单元测试。在我所做的事情中是否有其他方式或需要改变什么

提前谢谢你的帮助

java.lang.UnsupportedOperationException: can't write the bundle
at org.apache.hadoop.hive.ql.io.orc.OrcSerde$OrcSerdeRow.write(OrcSerde.java:61)
at org.apache.hadoop.io.serializer.WritableSerialization$WritableSerializer.serialize(WritableSerialization.java:98)
at org.apache.hadoop.io.serializer.WritableSerialization$WritableSerializer.serialize(WritableSerialization.java:82)
at org.apache.hadoop.mrunit.internal.io.Serialization.copy(Serialization.java:80)
at org.apache.hadoop.mrunit.internal.io.Serialization.copy(Serialization.java:97)
at org.apache.hadoop.mrunit.internal.io.Serialization.copyWithConf(Serialization.java:110)
at org.apache.hadoop.mrunit.TestDriver.copy(TestDriver.java:675)
at org.apache.hadoop.mrunit.TestDriver.copyPair(TestDriver.java:679)
at org.apache.hadoop.mrunit.MapDriverBase.addInput(MapDriverBase.java:120)
at org.apache.hadoop.mrunit.MapDriverBase.withInput(MapDriverBase.java:210)