The DataFrame is not empy. Indeed, it has nothing to do with serialization. I think that the issue is related to this bug: https://issues.apache.org/jira/browse/SPARK-22769 In my question I have not posted the whole error stack trace, but one of the error messages says `Could not find CoarseGrainedScheduler`. So, it's probably something related to the resources.
________________________________ From: Timur Shenkao <t...@timshenkao.su> Sent: 10 January 2018 20:07:37 To: Liana Napalkova Cc: user@spark.apache.org Subject: Re: py4j.protocol.Py4JJavaError: An error occurred while calling o794.parquet Caused by: org.apache.spark.SparkException: Task not serializable That's the answer :) What are you trying to save? Is it empty or None / null? On Wed, Jan 10, 2018 at 4:58 PM, Liana Napalkova <liana.napalk...@eurecat.org<mailto:liana.napalk...@eurecat.org>> wrote: Hello, Has anybody faced the following problem in PySpark? (Python 2.7.12): df.show() # works fine and shows the first 5 rows of DataFrame df.write.parquet(outputPath + '/data.parquet', mode="overwrite") # throws the error The last line throws the following error: py4j.protocol.Py4JJavaError: An error occurred while calling o794.parquet. : org.apache.spark.SparkException: Job aborted. at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$write$1.apply$mcV$sp(FileFormatWriter.scala:215) at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$write$1.apply(FileFormatWriter.scala:173) at org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$write$1.apply(FileFormatWriter.scala:173) at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:65) at org.apache.spark.sql.execution.datasources.FileFormatWriter$.write(FileFormatWriter.scala:173) Caused by: org.apache.spark.SparkException: Exception thrown in awaitResult: at org.apache.spark.util.ThreadUtils$.awaitResult(ThreadUtils.scala:205) at org.apache.spark.sql.execution.exchange.BroadcastExchangeExec.doExecuteBroadcast(BroadcastExchangeExec.scala:123) at org.apache.spark.sql.execution.InputAdapter.doExecuteBroadcast(WholeStageCodegenExec.scala:248) at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeBroadcast$1.apply(SparkPlan.scala:127) at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeBroadcast$1.apply(SparkPlan.scala:127) at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeQuery$1.apply(SparkPlan.scala:138) Caused by: org.apache.spark.SparkException: Task not serializable at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:298) at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:288) at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:108) at org.apache.spark.SparkContext.clean(SparkContext.scala:2287) at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1.apply(RDD.scala:794) at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1.apply(RDD.scala:793) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) Caused by: java.lang.IllegalArgumentException at java.nio.Buffer.position(Buffer.java:244) at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:153) at java.nio.ByteBuffer.get(ByteBuffer.java:715) Caused by: java.nio.BufferUnderflowException at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:151) at java.nio.ByteBuffer.get(ByteBuffer.java:715) at org.apache.parquet.io.api.Binary$ByteBufferBackedBinary.getBytes(Binary.java:405) at org.apache.parquet.io.api.Binary$ByteBufferBackedBinary.getBytesUnsafe(Binary.java:414) at org.apache.parquet.io.api.Binary$ByteBufferBackedBinary.writeObject(Binary.java:484) at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) Thanks. 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