Github user uncleGen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17216#discussion_r105069281
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -380,7 +382,20 @@ class StreamExecution(
logInfo(s"Resuming streaming query, starting with batch $batchId")
currentBatchId = batchId
availableOffsets = nextOffsets.toStreamProgress(sources)
- offsetSeqMetadata =
nextOffsets.metadata.getOrElse(OffsetSeqMetadata())
+ val numShufflePartitionsFromConf =
sparkSession.conf.get(SQLConf.SHUFFLE_PARTITIONS)
+ offsetSeqMetadata = nextOffsets
+ .metadata
+ .getOrElse(OffsetSeqMetadata(0, 0, numShufflePartitionsFromConf))
+
+ /*
+ * For backwards compatibility, if # partitions was not recorded
in the offset log, then
+ * ensure it is non-zero. The new value is picked up from the conf.
+ */
--- End diff --
for inline comment with the code, use // and not /* .. */.
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