[英]Spark Structured Streaming with secured Kafka throwing : Not authorized to access group exception
[英]Can't access the data in Kafka Spark Streaming globally
我正在嘗試將數據從Kafka流式傳輸到Spark
JavaPairInputDStream<String, String> directKafkaStream = KafkaUtils.createDirectStream(ssc,
String.class,
String.class,
StringDecoder.class,
StringDecoder.class,
kafkaParams, topics);
在這里,我正在遍歷JavaPairInputDStream以處理RDD。
directKafkaStream.foreachRDD(rdd ->{
rdd.foreachPartition(items ->{
while (items.hasNext()) {
String[] State = items.next()._2.split("\\,");
System.out.println(State[2]+","+State[3]+","+State[4]+"--");
};
});
});
我可以在foreachRDD中獲取數據,而我的要求是必須全局訪問狀態數組。 當我嘗試全局訪問狀態數組時,出現異常
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
有什么建議么 ? 謝謝。
這更多的是將您的查詢表與流RDD結合在一起,以獲取具有匹配的“ code”和“ violationCode”字段的所有項目。
流程應該是這樣的。
注意下面的代碼不完整。 請完成所有待辦事項注釋。
JavaPairDStream<String, String> streamPair = directKafkaStream.mapToPair(new PairFunction<Tuple2<String, String>, String, String>() {
@Override
public Tuple2<String, String> call(Tuple2<String, String> tuple2) throws Exception {
System.out.println("Tuple2 Message is----------" + tuple2._2());
String[] state = tuple2._2.split("\\,");
return new Tuple2<>(state[4], tuple2._2()); //pair <ViolationCode, data>
}
});
streamPair.foreachRDD(new Function<JavaPairRDD<String, String>, Void>() {
JavaPairRDD<String, String> hivePairRdd = null;
@Override
public Void call(JavaPairRDD<String, String> stringStringJavaPairRDD) throws Exception {
if (hivePairRdd == null) {
hivePairRdd = initHiveRdd();
}
JavaPairRDD<String, Tuple2<String, String>> joinedRdd = stringStringJavaPairRDD.join(hivePairRdd);
System.out.println(joinedRdd.take(10));
//todo process joinedRdd here and save the results.
joinedRdd.count(); //to trigger an action
return null;
}
});
}
public static JavaPairRDD<String, String> initHiveRdd() {
JavaRDD<String> hiveTableRDD = null; //todo code to create RDD from hive table
JavaPairRDD<String, String> hivePairRdd = hiveTableRDD.mapToPair(new PairFunction<String, String, String>() {
@Override
public Tuple2<String, String> call(String row) throws Exception {
String code = null; //TODO process 'row' and get 'code' field
return new Tuple2<>(code, row);
}
});
return hivePairRdd;
}
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