Hi All, I am trying to convert sequence file to image in spark.
i found that when i was reading bytearrayinputstream from bytes it throws serialization exception. Any insight will be helpful. scala> sc.sequenceFile[NullWritable,BytesWritable]("D:/seqImage").map(x => {ImageIO.write(ImageIO.read(newByteArrayInputStream(x._2.copyBytes())),"png",new File("D:/ima"))}).collect 2018-04-28 15:45:52 ERROR Executor:91 - Exception in task 0.0 in stage 8.0 (TID 14) java.lang.IllegalArgumentException: image == null! at javax.imageio.ImageTypeSpecifier.createFromRenderedImage(Unknown Sour ce) at javax.imageio.ImageIO.getWriter(Unknown Source) at javax.imageio.ImageIO.write(Unknown Source) at $line117.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$1.apply(<cons ole>:31) at $line117.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$1.apply(<cons ole>:31) 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$$anonfun$12.apply(RDD.sca la:939) at org.apache.spark.rdd.RDD$$anonfun$collect$1$$anonfun$12.apply(RDD.sca la:939) at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.sc ala:2067) at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.sc ala:2067) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87) at org.apache.spark.scheduler.Task.run(Task.scala:109) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:345) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) 2018-04-28 15:45:52 WARN TaskSetManager:66 - Lost task 0.0 in stage 8.0 (TID 14 , localhost, executor driver): java.lang.IllegalArgumentException: image == null ! at javax.imageio.ImageTypeSpecifier.createFromRenderedImage(Unknown Sour ce) -- Selvam Raman "லஞ்சம் தவிர்த்து நெஞ்சம் நிமிர்த்து"