Github user tcondie commented on a diff in the pull request:
https://github.com/apache/spark/pull/15626#discussion_r85615514
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/HDFSMetadataLog.scala
---
@@ -44,9 +45,14 @@ import org.apache.spark.util.UninterruptibleThread
* Note: [[HDFSMetadataLog]] doesn't support S3-like file systems as they
don't guarantee listing
* files in a directory always shows the latest files.
*/
-class HDFSMetadataLog[T: ClassTag](sparkSession: SparkSession, path:
String)
+class HDFSMetadataLog[T <: AnyRef : ClassTag](sparkSession: SparkSession,
path: String)
extends MetadataLog[T] with Logging {
+ private implicit val formats = Serialization.formats(NoTypeHints)
+
+ /** Needed to serialize type T into JSON */
+ private implicit val manifest =
Manifest.classType[T](implicitly[ClassTag[T]].runtimeClass)
--- End diff --
Done.
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