Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/20922#discussion_r178027822
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/sources/RateStreamProvider.scala
---
@@ -0,0 +1,125 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.execution.streaming.sources
+
+import java.util.Optional
+
+import org.apache.spark.network.util.JavaUtils
+import org.apache.spark.sql.AnalysisException
+import
org.apache.spark.sql.execution.streaming.continuous.RateStreamContinuousReader
+import org.apache.spark.sql.sources.DataSourceRegister
+import org.apache.spark.sql.sources.v2._
+import org.apache.spark.sql.sources.v2.reader.streaming.{ContinuousReader,
MicroBatchReader}
+import org.apache.spark.sql.types._
+
+/**
+ * A source that generates increment long values with timestamps. Each
generated row has two
+ * columns: a timestamp column for the generated time and an auto
increment long column starting
+ * with 0L.
+ *
+ * This source supports the following options:
+ * - `rowsPerSecond` (e.g. 100, default: 1): How many rows should be
generated per second.
+ * - `rampUpTime` (e.g. 5s, default: 0s): How long to ramp up before the
generating speed
+ * becomes `rowsPerSecond`. Using finer granularities than seconds will
be truncated to integer
+ * seconds.
+ * - `numPartitions` (e.g. 10, default: Spark's default parallelism): The
partition number for the
+ * generated rows. The source will try its best to reach
`rowsPerSecond`, but the query may
+ * be resource constrained, and `numPartitions` can be tweaked to help
reach the desired speed.
+ */
+class RateStreamProvider extends DataSourceV2
+ with MicroBatchReadSupport with ContinuousReadSupport with
DataSourceRegister {
+ import RateStreamProvider._
+
+ override def createMicroBatchReader(
+ schema: Optional[StructType],
+ checkpointLocation: String,
+ options: DataSourceOptions): MicroBatchReader = {
--- End diff --
One of constructor parameter of `HDFSMetadataLog` is `SparkSession`.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
