[jira] [Commented] (KYLIN-941) poc and benchmark for cubing on spark

["ZhouQianhao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KYLIN-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14696350#comment-14696350 ] 

ZhouQianhao commented on KYLIN-941:
-----------------------------------

when implementing the spark cubing, a strange issue occurs

JavaRdd<String> rdd = some rdd;
    HashMap<Long, TypeA> zeroValue = new HashMap();
    // add initial key-value pair for zeroValue
    rdd.aggregate(zeroValue, 
                   new Function2<HashMap<Long, TypeA>,
                        String,
                        HashMap<Long, TypeA>>(){//implementation},
                   new Function2<HashMap<Long, TypeA>,
                        String,
                        HashMap<Long, TypeA>(){//implementation})

    here is the stack trace when i run the application:

Caused by: java.lang.ClassNotFoundException: TypeA
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:274)
	at org.apache.spark.serializer.JavaDeserializationStream$$anon$1.resolveClass(JavaSerializer.scala:66)
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1612)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
	at java.util.HashMap.readObject(HashMap.java:1180)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
	at org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:69)
	at org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:89)
	at org.apache.spark.util.Utils$.clone(Utils.scala:1458)
	at org.apache.spark.rdd.RDD$$anonfun$aggregate$1.apply(RDD.scala:1049)
	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:148)
	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:109)
	at org.apache.spark.rdd.RDD.withScope(RDD.scala:286)
	at org.apache.spark.rdd.RDD.aggregate(RDD.scala:1047)
	at org.apache.spark.api.java.JavaRDDLike$class.aggregate(JavaRDDLike.scala:413)
	at org.apache.spark.api.java.AbstractJavaRDDLike.aggregate(JavaRDDLike.scala:47)

however I have checked that TypeA is in the jar file which is in the classpath
    And when I use an empty HashMap as the zeroValue, the exception has gone

> poc and benchmark for cubing on spark
> -------------------------------------
>
>                 Key: KYLIN-941
>                 URL: https://issues.apache.org/jira/browse/KYLIN-941
>             Project: Kylin
>          Issue Type: Sub-task
>          Components: Spark Engine
>            Reporter: ZhouQianhao
>            Assignee: ZhouQianhao
>             Fix For: v0.8.1
>
>




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