Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/14987#discussion_r77744980
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/HDFSMetadataLog.scala
---
@@ -49,6 +49,10 @@ import org.apache.spark.util.UninterruptibleThread
class HDFSMetadataLog[T: ClassTag](sparkSession: SparkSession, path:
String)
extends MetadataLog[T] with Logging {
+ // Avoid serializing generic sequences, see SPARK-17372
+ require(implicitly[ClassTag[T]].runtimeClass != classOf[Seq[_]],
--- End diff --
This is just a best effort attempt for future Spark developers from
accidentally using HDFSMetadatalog[Seq[X]].
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