Github user jose-torres commented on a diff in the pull request:
https://github.com/apache/spark/pull/21392#discussion_r190112179
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/EpochCoordinator.scala
---
@@ -45,6 +45,11 @@ private[sql] case object IncrementAndGetEpoch extends
EpochCoordinatorMessage
*/
private[sql] case object StopContinuousExecutionWrites extends
EpochCoordinatorMessage
+/**
+ * Returns boolean indicating if size of the epochs queue has exceeded
maximum epoch backlog.
+ */
+private[sql] case object CheckIfMaxBacklogIsExceeded extends
EpochCoordinatorMessage
--- End diff --
I'm not sure we need to make a side-channel in the RPC handler for this.
I'd try to just make the query fail when the condition is reached in the first
place.
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