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From 周一帆 (JIRA) <j...@apache.org>
Subject [jira] [Commented] (SPARK-5569) Checkpoints cannot reference classes defined outside of Spark's assembly
Date Fri, 30 Oct 2015 02:03:27 GMT

    [ https://issues.apache.org/jira/browse/SPARK-5569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14981718#comment-14981718
] 

周一帆 commented on SPARK-5569:
----------------------------

I encountered the same problem when deseriable Array[Foo]() object from checkpoint file. Foo
is a class defined in my project and not in spark-assembly.jar.
I didn't use the path mentioned above. Instead, I found 2 work arounds and both solved the
probllem. But I think these 2 work-arounds can prove the patch works for all these situations.

1. Add java option "-Dsun.lang.ClassLoader.allowArraySyntax=true". From http://bugs.java.com/view_bug.do?bug_id=6434149
2. Change Array[Foo] to List[Foo].

> Checkpoints cannot reference classes defined outside of Spark's assembly
> ------------------------------------------------------------------------
>
>                 Key: SPARK-5569
>                 URL: https://issues.apache.org/jira/browse/SPARK-5569
>             Project: Spark
>          Issue Type: Bug
>          Components: Streaming
>            Reporter: Patrick Wendell
>
> Not sure if this is a bug or a feature, but it's not obvious, so wanted to create a JIRA
to make sure we document this behavior.
> First documented by Cody Koeninger:
> https://gist.github.com/koeninger/561a61482cd1b5b3600c
> {code}
> 15/01/12 16:07:07 INFO CheckpointReader: Attempting to load checkpoint from file file:/var/tmp/cp/checkpoint-1421100410000.bk
> 15/01/12 16:07:07 WARN CheckpointReader: Error reading checkpoint from file file:/var/tmp/cp/checkpoint-1421100410000.bk
> java.io.IOException: java.lang.ClassNotFoundException: org.apache.spark.rdd.kafka.KafkaRDDPartition
>         at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1043)
>         at org.apache.spark.streaming.dstream.DStreamCheckpointData.readObject(DStreamCheckpointData.scala:146)
>         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.defaultReadFields(ObjectInputStream.java:1990)
>         at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
>         at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
>         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
>         at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1706)
>         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1344)
>         at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
>         at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
>         at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
>         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
>         at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
>         at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:500)
>         at org.apache.spark.streaming.DStreamGraph$$anonfun$readObject$1.apply$mcV$sp(DStreamGraph.scala:180)
>         at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1040)
>         at org.apache.spark.streaming.DStreamGraph.readObject(DStreamGraph.scala:176)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
>         at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893)
>         at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
>         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
>         at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
>         at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
>         at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
>         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
>         at org.apache.spark.streaming.CheckpointReader$$anonfun$read$2.apply(Checkpoint.scala:251)
>         at org.apache.spark.streaming.CheckpointReader$$anonfun$read$2.apply(Checkpoint.scala:239)
>         at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
>         at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:34)
>         at org.apache.spark.streaming.CheckpointReader$.read(Checkpoint.scala:239)
>         at org.apache.spark.streaming.StreamingContext$.getOrCreate(StreamingContext.scala:552)
>         at example.CheckpointedExample$.main(CheckpointedExample.scala:34)
>         at example.CheckpointedExample.main(CheckpointedExample.scala)
>         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 org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:365)
>         at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
>         at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
> Caused by: java.lang.ClassNotFoundException: org.apache.spark.rdd.kafka.KafkaRDDPartition
>         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 java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:625)
>         at org.apache.spark.streaming.ObjectInputStreamWithLoader.resolveClass(Checkpoint.scala:279)
>         at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1612)
>         at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
>         at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1663)
>         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1344)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
>         at scala.collection.mutable.HashMap$$anonfun$readObject$1.apply(HashMap.scala:142)
>         at scala.collection.mutable.HashMap$$anonfun$readObject$1.apply(HashMap.scala:142)
>         at scala.collection.mutable.HashTable$class.init(HashTable.scala:105)
>         at scala.collection.mutable.HashMap.init(HashMap.scala:39)
>         at scala.collection.mutable.HashMap.readObject(HashMap.scala:142)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
>         at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893)
>         at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
>         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
>         at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
>         at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:500)
>         at org.apache.spark.streaming.dstream.DStreamCheckpointData$$anonfun$readObject$1.apply$mcV$sp(DStreamCheckpointData.scala:148)
>         at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1040)
>         ... 52 more
> {code}



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