Uploaded image for project: 'Spark'
  1. Spark
  2. SPARK-23434

Spark should not warn `metadata directory` for a HDFS file path

    XMLWordPrintableJSON

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 2.0.2, 2.1.2, 2.2.1, 2.3.0
    • Fix Version/s: 2.2.2, 2.3.1, 2.4.0
    • Component/s: SQL
    • Labels:
      None

      Description

      In a kerberized cluster, when Spark reads a file path (e.g. `people.json`), it warns with a wrong error message during looking up `people.json/_spark_metadata`. The root cause of this istuation is the difference between `LocalFileSystem` and `DistributedFileSystem`. `LocalFileSystem.exists()` returns `false`, but `DistributedFileSystem.exists` raises Exception.

      scala> spark.version
      res0: String = 2.4.0-SNAPSHOT
      
      scala> spark.read.json("file:///usr/hdp/current/spark-client/examples/src/main/resources/people.json").show
      +----+-------+
      | age|   name|
      +----+-------+
      |null|Michael|
      |  30|   Andy|
      |  19| Justin|
      +----+-------+
      
      scala> spark.read.json("hdfs:///tmp/people.json")
      18/02/15 05:00:48 WARN streaming.FileStreamSink: Error while looking for metadata directory.
      18/02/15 05:00:48 WARN streaming.FileStreamSink: Error while looking for metadata directory.
      res6: org.apache.spark.sql.DataFrame = [age: bigint, name: string]
      
      scala> spark.version
      res0: String = 2.2.1
      
      scala> spark.read.json("hdfs:///tmp/people.json").show
      18/02/15 05:28:02 WARN FileStreamSink: Error while looking for metadata directory.
      18/02/15 05:28:02 WARN FileStreamSink: Error while looking for metadata directory.
      
      scala> spark.version
      res0: String = 2.1.2
      
      scala> spark.read.json("hdfs:///tmp/people.json").show
      18/02/15 05:29:53 WARN DataSource: Error while looking for metadata directory.
      +----+-------+
      | age|   name|
      +----+-------+
      |null|Michael|
      |  30|   Andy|
      |  19| Justin|
      +----+-------+
      
      scala> spark.version
      res0: String = 2.0.2
      
      scala> spark.read.json("hdfs:///tmp/people.json").show
      18/02/15 05:25:24 WARN DataSource: Error while looking for metadata directory.
      

        Attachments

          Activity

            People

            • Assignee:
              dongjoon Dongjoon Hyun
              Reporter:
              dongjoon Dongjoon Hyun
            • Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: