Yea, I met this case before. I guess this is related with
https://issues.apache.org/jira/browse/SPARK-15393.
2016-06-15 8:46 GMT+09:00 antoniosi <antonio...@gmail.com>:
> I tried the following code in both Spark 1.5.1 and Spark 1.6.0:
>
> import org.apache.spark.sql.types.{
> StructType, StructField, StringType, IntegerType}
> import org.apache.spark.sql.Row
>
> val schema = StructType(
> StructField("k", StringType, true) ::
> StructField("v", IntegerType, false) :: Nil)
>
> sqlContext.createDataFrame(sc.emptyRDD[Row], schema)
> df.write.save("hdfs://xxx")
>
> Both 1.5.1 and 1.6.0 only save _SUCCESS file. It does not save any
> _metadata
> files. Also, in 1.6.0, it also gives the following error:
>
> 16/06/14 16:29:27 WARN ParquetOutputCommitter: could not write summary file
> for hdfs://xxx
> java.lang.NullPointerException
> at
>
> org.apache.parquet.hadoop.ParquetFileWriter.mergeFooters(ParquetFileWriter.java:456)
> at
>
> org.apache.parquet.hadoop.ParquetFileWriter.writeMetadataFile(ParquetFileWriter.java:420)
> at
>
> org.apache.parquet.hadoop.ParquetOutputCommitter.writeMetaDataFile(ParquetOutputCommitter.java:58)
> at
>
> org.apache.parquet.hadoop.ParquetOutputCommitter.commitJob(ParquetOutputCommitter.java:48)
> at
>
> org.apache.spark.sql.execution.datasources.BaseWriterContainer.commitJob(WriterContainer.scala:230)
> at
>
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1.apply$mcV$sp(InsertIntoHadoopFsRelation.scala:151)
> at
>
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1.apply(InsertIntoHadoopFsRelation.scala:108)
> at
>
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1.apply(InsertIntoHadoopFsRelation.scala:108)
>
> I do not get this exception in 1.5.1 version though.
>
> I see this bug https://issues.apache.org/jira/browse/SPARK-15393, but this
> is for Spark 2.0. Is there a same bug in Spark 1.5.1 and 1.6?
>
> Is there a way we could save an empty dataframe properly?
>
> Thanks.
>
> Antonio.
>
>
>
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