[GitHub] spark pull request #15538: [SPARK-17993][SQL] Fix Parquet log output redirec...

[mallman <gi...@git.apache.org>]

Github user mallman commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15538#discussion_r86837361
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFileFormat.scala ---
    @@ -55,6 +56,21 @@ class ParquetFileFormat
       with DataSourceRegister
       with Logging
       with Serializable {
    +  // Poor man's "static initializer". Scala doesn't have language support for static initializers,
    +  // and it's important that we initialize `ParquetFileFormat.redirectParquetLogsViaSLF4J` before
    +  // doing anything with the Parquet libraries. Rather than expect clients to initialize the
    +  // `ParquetFileFormat` singleton object at the right time, we put that initialization in the
    +  // constructor of this class. This method is idempotent, and essentially a no-op after its first
    +  // call.
    +  ParquetFileFormat.ensureParquetLogRedirection
    +
    +  // Java serialization will not call the default constructor. Make sure we call
    +  // ParquetFileFormat.ensureParquetLogRedirection in deserialization by implementing this hook
    +  // method.
    +  private def readObject(in: ObjectInputStream): Unit = {
    +    in.defaultReadObject
    +    ParquetFileFormat.ensureParquetLogRedirection
    --- End diff --
    
    I've tried to keep this code isolated to the parquet implementation.


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