Github user yanlin-Lynn commented on a diff in the pull request:
https://github.com/apache/spark/pull/21392#discussion_r190108352
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/ContinuousExecution.scala
---
@@ -233,9 +235,15 @@ class ContinuousExecution(
}
false
} else if (isActive) {
- currentBatchId =
epochEndpoint.askSync[Long](IncrementAndGetEpoch)
- logInfo(s"New epoch $currentBatchId is starting.")
- true
+ val maxBacklogExceeded =
epochEndpoint.askSync[Boolean](CheckIfMaxBacklogIsExceeded)
+ if (maxBacklogExceeded) {
+ throw new IllegalStateException(
+ "Size of the epochs queue has exceeded maximum allowed
epoch backlog.")
--- End diff --
Throw exception will cause application to fail.
I think it's better to block and wait old epoch to be committed.
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