Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20369#discussion_r163751286
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/streaming/DataStreamWriter.scala
---
@@ -281,11 +281,9 @@ final class DataStreamWriter[T] private[sql](ds:
Dataset[T]) {
trigger = trigger)
} else {
val ds = DataSource.lookupDataSource(source,
df.sparkSession.sessionState.conf)
- val sink = (ds.newInstance(), trigger) match {
- case (w: ContinuousWriteSupport, _: ContinuousTrigger) => w
- case (_, _: ContinuousTrigger) => throw new
UnsupportedOperationException(
- s"Data source $source does not support continuous writing")
- case (w: MicroBatchWriteSupport, _) => w
+ val disabledSources =
df.sparkSession.sqlContext.conf.disabledV2StreamingWriters.split(",")
--- End diff --
ok so this is only useful for built-in stream sources, as the v1 source API
is not public,
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