Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/15949#discussion_r89237316
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -38,6 +40,27 @@ import org.apache.spark.sql.streaming._
import org.apache.spark.util.{Clock, UninterruptibleThread, Utils}
/**
+ * Contains metadata associated with a stream execution. This information
is
+ * persisted to the offset log via the OffsetSeq metadata field. Current
+ * information contained in this object includes:
+ *
+ * @param currentEventTimeWatermarkMillis: The current eventTime
watermark, used to
+ * bound the lateness of data that will processed. Time unit: milliseconds
+ * @param currentBatchTimestampMillis: The current batch processing
timestamp.
+ * Time unit: milliseconds
+ */
+case class StreamExecutionMetadata(
+ var currentEventTimeWatermarkMillis: Long = 0,
--- End diff --
nit: this is pretty long! how about just `batchWatermarkMs`, and
`batchTimestampMs`. Its not really current if a batch is being reprocessed.
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