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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