Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/17216#discussion_r106058765
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -380,7 +387,27 @@ class StreamExecution(
logInfo(s"Resuming streaming query, starting with batch $batchId")
currentBatchId = batchId
availableOffsets = nextOffsets.toStreamProgress(sources)
- offsetSeqMetadata =
nextOffsets.metadata.getOrElse(OffsetSeqMetadata())
+
+ // initialize metadata
+ val shufflePartitionsSparkSession: Int =
sparkSession.conf.get(SQLConf.SHUFFLE_PARTITIONS)
+ offsetSeqMetadata = {
+ if (nextOffsets.metadata.isEmpty) {
+ OffsetSeqMetadata(0, 0,
+ Map(SQLConf.SHUFFLE_PARTITIONS.key ->
shufflePartitionsSparkSession.toString))
+ } else {
+ val metadata = nextOffsets.metadata.get
+ val shufflePartitionsToUse =
metadata.conf.getOrElse(SQLConf.SHUFFLE_PARTITIONS.key, {
+ // For backward compatibility, if # partitions was not
recorded in the offset log,
+ // then ensure it is not missing. The new value is picked up
from the conf.
+ logDebug("Number of shuffle partitions from previous run not
found in checkpoint. "
--- End diff --
Make this a log warning. So that we can debug. And it should be printed
only once, at the time of upgrading for the first time.
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