My suggestion after reading ClassNotFoundException is to try to instantiate
the class just before deserializing it:
public static Block deserializeFrom(byte[] bytes) {
// Dummy instantiation to ensure Block class and its related classes
are available
System.out.println("dummy = " + new Block());
System.out.println("byte length = " + bytes.length); // Does this match
what you expect?
try {
Block b = SerializationUtils.deserialize(bytes);
...
Looking forward to hearing the result.
On Wed, Jun 26, 2019 at 11:03 PM big data <[email protected]> wrote:
> The XXX Class named Block, below is part codes of it:
>
> The deserialize code like this:
>
> public static Block deserializeFrom(byte[] bytes) {
> try {
> Block b = SerializationUtils.deserialize(bytes);
> System.out.println("b="+b);
> return b;
> } catch (ClassCastException e) {
> System.out.println("ClassCastException");
> e.printStackTrace();
> } catch (IllegalArgumentException e) {
> System.out.println("IllegalArgumentException");
> e.printStackTrace();
>
> } catch (SerializationException e) {
> System.out.println("SerializationException");
> e.printStackTrace();
> }
> return null;
> }
>
>
> The Spark code is:
>
> val fis = spark.sparkContext.binaryFiles("/folder/abc*.file")
> val RDD = fis.map(x => {
> val content = x._2.toArray()
> val b = Block.deserializeFrom(content)
> ...
> }
>
>
> All codes above can run successfully in Spark local mode, but when run it
> in Yarn cluster mode, the error happens.
>
> 在 2019/6/27 上午9:49, Tomo Suzuki 写道:
>
> I'm afraid that I don't have enough information to troubleshoot problem in
> com.XXX.XXX. It would be great if you can create a minimal example project
> that can reproduce the same issue.
>
> Regards,
> Tomo
>
> On Wed, Jun 26, 2019 at 9:20 PM big data <[email protected]><mailto:
> [email protected]> wrote:
>
>
>
> Hi,
>
> Actually, the class com.XXX.XXX is normally called in the before spark
> code, and this exception error is happened in one static method of this
> class.
>
> So the jar dependency problem can be excluded.
>
> 在 2019/6/26 下午10:23, Tomo Suzuki 写道:
>
>
> Hi Big data,
>
> I don't use SerializationUtils, but if I interpret the error message:
>
> ClassNotFoundException: com.XXXX.XXXX
>
> , this says com.XXXX.XXXX is not available in the class path of JVM
>
>
> (which
>
>
> your Spark is running on). I would verify that you can instantiate
> com.XXXX.XXXX in Spark/Scala *without* SerializationUtils.
>
> Regards,
> Tomo
>
>
>
> On Wed, Jun 26, 2019 at 4:12 AM big data <[email protected]><mailto:
> [email protected]>
>
>
> wrote:
>
>
>
>
>
> I use Apache Commons Lang3's SerializationUtils in the code.
>
> SerializationUtils.serialize()
>
> to store a customized class as files into disk and
>
> SerializationUtils.deserialize(byte[])
>
> to restore them again.
>
> In the local environment (Mac OS), all serialized files can be
> deserialized normally and no error happens. But when I copy these
> serialized files into HDFS, and read them from HDFS by using
>
>
> Spark/Scala, a
>
>
> SerializeException happens.
>
> The Apache Commons Lang3 version is:
>
> <dependency>
> <groupId>org.apache.commons</groupId>
> <artifactId>commons-lang3</artifactId>
> <version>3.9</version>
> </dependency>
>
>
> the stack error as below:
>
> org.apache.commons.lang3.SerializationException:
> java.lang.ClassNotFoundException: com.XXXX.XXXX
> at
>
>
>
>
> org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:227)
>
>
> at
>
>
>
>
> org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:265)
>
>
> at com.com.XXXX.XXXX.deserializeFrom(XXX.java:81)
> at com.XXX.FFFF$$anonfun$3.apply(BXXXX.scala:157)
> at com.XXX.FFFF$$anonfun$3.apply(BXXXX.scala:153)
> at scala.collection.Iterator$$anon$11.next(Iterator.scala:409)
> at scala.collection.Iterator$class.foreach(Iterator.scala:893)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
> at
> scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:59)
> at
>
>
>
> scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:104)
>
>
> at
> scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:48)
> at scala.collection.TraversableOnce$class.to
> (TraversableOnce.scala:310)
> at scala.collection.AbstractIterator.to(Iterator.scala:1336)
> at
>
>
>
> scala.collection.TraversableOnce$class.toBuffer(TraversableOnce.scala:302)
>
>
> at scala.collection.AbstractIterator.toBuffer(Iterator.scala:1336)
> at
>
>
>
> scala.collection.TraversableOnce$class.toArray(TraversableOnce.scala:289)
>
>
> at scala.collection.AbstractIterator.toArray(Iterator.scala:1336)
> at
>
>
>
>
> org.apache.spark.rdd.RDD$$anonfun$collect$1$$anonfun$12.apply(RDD.scala:945)
>
>
> at
>
>
>
>
> org.apache.spark.rdd.RDD$$anonfun$collect$1$$anonfun$12.apply(RDD.scala:945)
>
>
> at
>
>
>
>
> org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:2074)
>
>
> at
>
>
>
>
> org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:2074)
>
>
> at
>
>
> org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
>
>
> at org.apache.spark.scheduler.Task.run(Task.scala:109)
> at
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:345)
> at
>
>
>
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>
>
> at
>
>
>
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>
>
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.ClassNotFoundException: com.XXXX.XXXX
> at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:348)
> at
>
>
> java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:686)
>
>
> at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1868)
> at
>
>
> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1751)
>
>
> at
>
>
>
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2042)
>
>
> at
>
>
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573)
>
>
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431)
> at
>
>
>
>
> org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:223)
>
>
>
> I've check the loaded byte[]'s length, both from local and from HDFS are
> same. But why it can not be deserialized from HDFS?
>
>
>
>
>
>
>
>
>
>
>
>
>
--
Regards,
Tomo
