[ https://issues.apache.org/jira/browse/SPARK-2442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved SPARK-2442. ------------------------------ Resolution: Duplicate > Add a Hadoop Writable serializer > -------------------------------- > > Key: SPARK-2442 > URL: https://issues.apache.org/jira/browse/SPARK-2442 > Project: Spark > Issue Type: Bug > Reporter: Hari Shreedharan > > Using data read from hadoop files in shuffles can cause exceptions with the > following stacktrace: > {code} > java.io.NotSerializableException: org.apache.hadoop.io.BytesWritable > at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1181) > at > java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1541) > at > java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1506) > at > java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429) > at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175) > at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347) > at > org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:42) > at > org.apache.spark.storage.DiskBlockObjectWriter.write(BlockObjectWriter.scala:179) > at > org.apache.spark.scheduler.ShuffleMapTask$$anonfun$runTask$1.apply(ShuffleMapTask.scala:161) > at > org.apache.spark.scheduler.ShuffleMapTask$$anonfun$runTask$1.apply(ShuffleMapTask.scala:158) > at scala.collection.Iterator$class.foreach(Iterator.scala:727) > at scala.collection.AbstractIterator.foreach(Iterator.scala:1157) > at > org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:158) > at > org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:99) > at org.apache.spark.scheduler.Task.run(Task.scala:51) > at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:183) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > at java.lang.Thread.run(Thread.java:679) > {code} > This though seems to go away if Kyro serializer is used. I am wondering if > adding a Hadoop-writables friendly serializer makes sense as it is likely to > perform better than Kyro without registration, since Writables don't > implement Serializable - so the serialization might not be the most efficient. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org