Grant Henke has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/12087 )

Change subject: KUDU-2640: Add Spark Structured Streaming Sink
......................................................................

KUDU-2640: Add Spark Structured Streaming Sink

This patch adds a KuduSink and implements the
Spark StreamSinkProvider interface to support
structured streaming writes to Kudu.

These writes behave the same as writes performed
via the InsertableRelation interface.

Note: The StreamSinkProvider interface is
marked as experimental and unstable, but it has existed
since Spark 2.0.0 and is used by the Kafka integration.
Additionally, per SPARK-26415, there will be no
more Spark 2.x minor releases and Spark would
not break this API in a maintenance release. This
means the interface is effectively stable for all
of Spark 2.

Change-Id: I731e35f82c8cca7d911e4d879aa6853112132b17
Reviewed-on: http://gerrit.cloudera.org:8080/12087
Tested-by: Kudu Jenkins
Reviewed-by: Andrew Wong <[email protected]>
---
M java/kudu-spark/src/main/scala/org/apache/kudu/spark/kudu/DefaultSource.scala
M java/kudu-spark/src/test/scala/org/apache/kudu/spark/kudu/StreamingTest.scala
2 files changed, 70 insertions(+), 37 deletions(-)

Approvals:
  Kudu Jenkins: Verified
  Andrew Wong: Looks good to me, approved

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I731e35f82c8cca7d911e4d879aa6853112132b17
Gerrit-Change-Number: 12087
Gerrit-PatchSet: 6
Gerrit-Owner: Grant Henke <[email protected]>
Gerrit-Reviewer: Andrew Wong <[email protected]>
Gerrit-Reviewer: Grant Henke <[email protected]>
Gerrit-Reviewer: Hao Hao <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Mike Percy <[email protected]>

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