Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16322#discussion_r93553479
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -559,7 +580,36 @@ class StreamExecution(
/** A flag to indicate that a batch has completed with no new data
available. */
@volatile private var noNewData = false
+ /**
+ * Assert that the await APIs should not be called in the stream thread.
Otherwise, it may cause
+ * dead-lock.
--- End diff --
Document what kind of deadlock can happen.
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