Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/19239#discussion_r139069662
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -130,6 +130,13 @@ class StreamExecution(
protected var offsetSeqMetadata = OffsetSeqMetadata(
batchWatermarkMs = 0, batchTimestampMs = 0, sparkSession.conf)
+ /**
+ * A map of current watermarks, keyed by the position of the watermark
operator in the
+ * physical plan. The minimum watermark timestamp present here will be
used and persisted as the
+ * query's watermark when preparing each batch, so it's ok that this val
isn't fault-tolerant.
--- End diff --
Make it clear that "this state is soft state and does not require
persistence, because the minimum .....
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