Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/17594#discussion_r110760826
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -304,8 +304,8 @@ class StreamExecution(
finishTrigger(dataAvailable)
if (dataAvailable) {
// Update committed offsets.
- committedOffsets ++= availableOffsets
batchCommitLog.add(currentBatchId)
--- End diff --
Technically, when there is a batch with data, it finishes executing and
then increments the batch id for the next batch. But if next batch has no data,
then the batchid not further increment, and gets eventually used in a future
batch with data.
So i think it is correct to update the commit log as soon this batch is
done, and before the batch id is incremented for next batch. This change
maintains that invariant as far as i think.
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