我尝试在Spark项目中运行简单的Kafka示例。
火花构建正确,所以我可以运行大多数示例,除了这个Kafka示例。
当我运行以下命令时:
fromcal=Calendar.getInstance();
tocal=Calendar.getInstance();
final DatePickerDialog.OnDateSetListener fromdate = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker datePicker, int year, int monthOfYear, int dayOfMonth) {
fromcal.set(Calendar.YEAR,year);
fromcal.set(Calendar.MONTH,monthOfYear);
fromcal.set(Calendar.DAY_OF_MONTH, dayOfMonth);
updateFromDate();
}
};
fromtext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new DatePickerDialog(RequestLeaveActivity.this,fromdate,
fromcal.get(Calendar.YEAR),fromcal.get(Calendar.MONTH),
fromcal.get(Calendar.DAY_OF_MONTH)).show();
}
});
final DatePickerDialog.OnDateSetListener todate = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker datePicker, int year, int monthOfYear, int dayOfMonth) {
tocal.set(Calendar.YEAR,year);
tocal.set(Calendar.MONTH,monthOfYear);
tocal.set(Calendar.DAY_OF_MONTH, dayOfMonth);
updateToDate();
}
};
totext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new DatePickerDialog(RequestLeaveActivity.this,todate,
tocal.get(Calendar.YEAR),tocal.get(Calendar.MONTH),
tocal.get(Calendar.DAY_OF_MONTH)).show();
}
});
我收到以下错误:
bin/run-example streaming.JavaDirectKafkaWordCount localhost:9092 test
我们怎么能正确地运行Kafka示例?
(在端口Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/streaming/kafka010/LocationStrategies
上运行的Kafka客户端。使用最新的Spark和Kafka,以及Java 8)
答案 0 :(得分:0)
在我的项目中,最后我正确地将Kafka和Spark连接在一起。我意识到,在开发过程中使用Spark脚本中的local
模式非常有用。调试和练习容易得多。
您可以在此处找到详细的,Docker化的实现:https://github.com/zoltan-nz/kafka-spark-project