[jira] [Created] (SPARK-11794) Improve error message when HDFS/S3 access is misconfigured when using Parquet

["Mark Grover (JIRA)" <ji...@apache.org>]

Mark Grover created SPARK-11794:
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             Summary: Improve error message when HDFS/S3 access is misconfigured when using Parquet
                 Key: SPARK-11794
                 URL: https://issues.apache.org/jira/browse/SPARK-11794
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 1.6.0
            Reporter: Mark Grover


I had a scenario where I was accessing HDFS from a node set up for secure HDFS access. However, my actual HDFS cluster was set up in non-secure mode. This mismatch of configuration didn't allow me to access HDFS. However, when running a Spark app on some Parquet data on the said inaccessible HDFS, one gets a message like this:

{code}
java.lang.AssertionError: assertion failed: No predefined schema found, and no Parquet data files or summary files found under 
{code}

Which is very misleading. And, I am not the only one this has happened to. See SPARK-9565 for another similar situation.



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