Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/15801#discussion_r86914130
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/streaming/test/DataStreamReaderWriterSuite.scala
---
@@ -467,4 +468,37 @@ class DataStreamReaderWriterSuite extends StreamTest
with BeforeAndAfter {
val sq = df.writeStream.format("console").start()
sq.stop()
}
+
+ test("MemorySink can recover from a checkpoint in Complete Mode") {
+ val df = spark.readStream
+ .format("org.apache.spark.sql.streaming.test")
+ .load("/test")
+ val checkpointLoc = newMetadataDir
+ val checkpointDir = new File(checkpointLoc, "offsets")
+ checkpointDir.mkdirs()
+ assert(checkpointDir.exists())
+ // no exception here
+ val q = df
+ .groupBy("a")
+ .count()
+ .writeStream
+ .format("memory")
+ .queryName("test")
+ .option("checkpointLocation", checkpointLoc)
+ .outputMode("complete")
+ .start()
+
--- End diff --
This test should also check that the memory sink data is recovered to be
the same as before failure.
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