Я пытаюсь создать пользовательскую раковину для распаковки файлов.Google Dataflow: java.lang.IllegalArgumentException: Can not setCoder (null)
Имея этот простой код:
public static class ZipIO{
public static class Sink extends com.google.cloud.dataflow.sdk.io.Sink<String> {
private static final long serialVersionUID = -7414200726778377175L;
private final String unzipTarget;
public Sink withDestinationPath(String s){
if(s!=""){
return new Sink(s);
}
else {
throw new IllegalArgumentException("must assign destination path");
}
}
protected Sink(String path){
this.unzipTarget = path;
}
@Override
public void validate(PipelineOptions po){
if(unzipTarget==null){
throw new RuntimeException();
}
}
@Override
public ZipFileWriteOperation createWriteOperation(PipelineOptions po){
return new ZipFileWriteOperation(this);
}
}
private static class ZipFileWriteOperation extends WriteOperation<String, UnzipResult>{
private static final long serialVersionUID = 7976541367499831605L;
private final ZipIO.Sink sink;
public ZipFileWriteOperation(ZipIO.Sink sink){
this.sink = sink;
}
@Override
public void initialize(PipelineOptions po) throws Exception{
}
@Override
public void finalize(Iterable<UnzipResult> writerResults, PipelineOptions po) throws Exception {
long totalFiles = 0;
for(UnzipResult r:writerResults){
totalFiles +=r.filesUnziped;
}
LOG.info("Unzipped {} Files",totalFiles);
}
@Override
public ZipIO.Sink getSink(){
return sink;
}
@Override
public ZipWriter createWriter(PipelineOptions po) throws Exception{
return new ZipWriter(this);
}
}
private static class ZipWriter extends Writer<String, UnzipResult>{
private final ZipFileWriteOperation writeOp;
public long totalUnzipped = 0;
ZipWriter(ZipFileWriteOperation writeOp){
this.writeOp = writeOp;
}
@Override
public void open(String uID) throws Exception{
}
@Override
public void write(String p){
System.out.println(p);
}
@Override
public UnzipResult close() throws Exception{
return new UnzipResult(this.totalUnzipped);
}
@Override
public ZipFileWriteOperation getWriteOperation(){
return writeOp;
}
}
private static class UnzipResult implements Serializable{
private static final long serialVersionUID = -8504626439217544799L;
public long filesUnziped=0;
public UnzipResult(long filesUnziped){
this.filesUnziped=filesUnziped;
}
}
}
}
Обработка с ошибкой:
Exception in thread "main" java.lang.IllegalArgumentException: Cannot setCoder(null) at com.google.cloud.dataflow.sdk.values.TypedPValue.setCoder(TypedPValue.java:67) at com.google.cloud.dataflow.sdk.values.PCollection.setCoder(PCollection.java:150) at com.google.cloud.dataflow.sdk.io.Write$Bound.createWrite(Write.java:380) at com.google.cloud.dataflow.sdk.io.Write$Bound.apply(Write.java:112) at com.google.cloud.dataflow.sdk.runners.DataflowPipelineRunner$BatchWrite.apply(DataflowPipelineRunner.java:2118) at com.google.cloud.dataflow.sdk.runners.DataflowPipelineRunner$BatchWrite.apply(DataflowPipelineRunner.java:2099) at com.google.cloud.dataflow.sdk.runners.PipelineRunner.apply(PipelineRunner.java:75) at com.google.cloud.dataflow.sdk.runners.DataflowPipelineRunner.apply(DataflowPipelineRunner.java:465) at com.google.cloud.dataflow.sdk.runners.BlockingDataflowPipelineRunner.apply(BlockingDataflowPipelineRunner.java:169) at com.google.cloud.dataflow.sdk.Pipeline.applyInternal(Pipeline.java:368) at com.google.cloud.dataflow.sdk.Pipeline.applyTransform(Pipeline.java:275) at com.google.cloud.dataflow.sdk.runners.DataflowPipelineRunner.apply(DataflowPipelineRunner.java:463) at com.google.cloud.dataflow.sdk.runners.BlockingDataflowPipelineRunner.apply(BlockingDataflowPipelineRunner.java:169) at com.google.cloud.dataflow.sdk.Pipeline.applyInternal(Pipeline.java:368) at com.google.cloud.dataflow.sdk.Pipeline.applyTransform(Pipeline.java:291) at com.google.cloud.dataflow.sdk.values.PCollection.apply(PCollection.java:174) at com.mcd.de.tlogdataflow.StarterPipeline.main(StarterPipeline.java:93)
Любая помощь приветствуется.
Благодаря & BR Philipp
Hi Кенн, спасибо за вашу помощь. Я изменил его на длинную структуру, когда операция close() вернула длинную. Тем не менее, я получаю то же самое не может setCoder (null) Exception. – bigdataclown
Привет, Кенн, вы нашли решение для этого? Спасибо & BR Philipp – bigdataclown
Вы переопределили 'getWriterResultCoder()'? Это то, что вам нужно будет сделать. –