Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/17219#discussion_r106738370
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -206,6 +207,12 @@ class StreamExecution(
*/
val offsetLog = new OffsetSeqLog(sparkSession, checkpointFile("offsets"))
+ /**
+ * A log that records the committed batch ids. This is used to check if
a batch was committed
+ * on restart, instead of (possibly) re-running the previous batch.
--- End diff --
Also, keep the comment generic such that it does mean that not only the
previous batch will be re-run. in future we could be rerun multiple batches.
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