如何通過Servlet的doGet在Spark集群上運行Spark應用程序？

Question

我正在嘗試在集群模式下從servlet運行Spark應用程序。

在local和群集模式下使用spark-submit ，它可以正常工作。 但是在集群模式下從Servlet的doGet()方法運行時卻沒有。

這是例外：

org.apache.spark.SparkException: Job aborted due to stage failure: Task 1 in stage 5.0 failed 4 times, most recent failure: Lost task 1.3 in stage 5.0 (TID 24, 192.168.1.38): java.lang.ClassNotFoundException: ngi.spark.manipulator.util.UtilSparkRDD$1
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:278)
    at org.apache.spark.serializer.JavaDeserializationStream$$anon$1.resolveClass(JavaSerializer.scala:66)
    at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1612)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at scala.collection.immutable.$colon$colon.readObject(List.scala:362)
    at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1897)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at scala.collection.immutable.$colon$colon.readObject(List.scala:362)
    at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1897)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at scala.collection.immutable.$colon$colon.readObject(List.scala:362)
    at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1897)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1997)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1921)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:69)
    at org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:95)
    at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:61)
    at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
    at org.apache.spark.scheduler.Task.run(Task.scala:70)
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:213)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

Driver stacktrace:

我將我的servlet部署在Apache Tomcat上，並且在發送GET請求以運行我的Spark程序時發生上述SparkException。

這是要發生異常的類：

public class UtilSparkRDD implements Serializable {

    private static final long serialVersionUID = 8077220930563809961L;

    public JavaRDD<Row> getDataFromFile(JavaSparkContext sparkContext,
            String filePath, final String rowDelimeter, final String  fieldDelimeter) {
        JavaRDD<String> javaRDD = sparkContext.textFile(filePath).flatMap(
                new FlatMapFunction<String, String>() {
                    private static final long serialVersionUID = 8248977466300597565L;

                    public Iterable<String> call(String data) {
                        return Arrays.asList(data.split(rowDelimeter));
                    }
                });

        // Convert records of the RDD to Rows.
        JavaRDD<Row> rowRDD = javaRDD.map(
                new Function<String, Row>() {

                    private static final long serialVersionUID = 4608543635003549767L;

                    public Row call(String record) throws Exception {
                        Object[] fields = record.split(fieldDelimeter);
                        return RowFactory.create(fields);


                    }   
                });
        return rowRDD;
    }
}

Answer 1

真正的原因在於創建SparkContext實例的位置和方式 。 為序列化程序抓取太多資源以通過導線發送給執行者以啟動任務是很常見的。

ngi.spark.manipulator.util.UtilSparkRDD是UtilSparkRDD類的標准軟件包名稱，不是嗎？

整個類被序列化並發送給執行者，但是他們沒有本地存儲在其CLASSPATH上，反序列化失敗。

一種解決方案是具有不應通過電線發送的靜態或瞬態字段，並且確切地說，有必要查看整個ngi.spark.manipulator.util.UtilSparkRDD 。

Answer 2

我在火花上下文中添加了該罐子...並解決了我的問題。

sparkContext.addJar("/home/ngi/ManipulatorNew-0.0.1-SNAPSHOT-jar-with-dependencies.jar");