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https://issues.apache.org/jira/browse/SPARK-20799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun resolved SPARK-20799.
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Resolution: Won't Fix
> Unable to infer schema for ORC/Parquet on S3N when secrets are in the URL
> -------------------------------------------------------------------------
>
> Key: SPARK-20799
> URL: https://issues.apache.org/jira/browse/SPARK-20799
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.1
> Environment: Hadoop 2.8.0 binaries
> Reporter: Jork Zijlstra
> Priority: Minor
>
> We are getting the following exception:
> {code}org.apache.spark.sql.AnalysisException: Unable to infer schema for ORC.
> It must be specified manually.{code}
> Combining following factors will cause it:
> - Use S3
> - Use format ORC
> - Don't apply a partitioning on de data
> - Embed AWS credentials in the path
> The problem is in the PartitioningAwareFileIndex def allFiles()
> {code}
> leafDirToChildrenFiles.get(qualifiedPath)
> .orElse { leafFiles.get(qualifiedPath).map(Array(_)) }
> .getOrElse(Array.empty)
> {code}
> leafDirToChildrenFiles uses the path WITHOUT credentials as its key while the
> qualifiedPath contains the path WITH credentials.
> So leafDirToChildrenFiles.get(qualifiedPath) doesn't find any files, so no
> data is read and the schema cannot be defined.
> Spark does output the S3xLoginHelper:90 - The Filesystem URI contains login
> details. This is insecure and may be unsupported in future., but this should
> not mean that it shouldn't work anymore.
> Workaround:
> Move the AWS credentials from the path to the SparkSession
> {code}
> SparkSession.builder
> .config("spark.hadoop.fs.s3n.awsAccessKeyId", {awsAccessKeyId})
> .config("spark.hadoop.fs.s3n.awsSecretAccessKey", {awsSecretAccessKey})
> {code}
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