amaliujia commented on code in PR #40783: URL: https://github.com/apache/spark/pull/40783#discussion_r1165937371
########## connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/streaming/StreamingQuery.scala: ########## @@ -0,0 +1,316 @@ +/* + * 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.streaming + +import java.util.UUID +import java.util.concurrent.TimeoutException + +import scala.collection.JavaConverters._ + +import org.apache.spark.annotation.Evolving +import org.apache.spark.connect.proto.Command +import org.apache.spark.connect.proto.ExecutePlanResponse +import org.apache.spark.connect.proto.StreamingQueryCommand +import org.apache.spark.connect.proto.StreamingQueryCommandResult +import org.apache.spark.connect.proto.StreamingQueryInstanceId +import org.apache.spark.sql.SparkSession + +/** + * A handle to a query that is executing continuously in the background as new data arrives. + * All these methods are thread-safe. + * @since 3.5.0 + */ +@Evolving +trait StreamingQuery { + + /** + * Returns the user-specified name of the query, or null if not specified. + * This name can be specified in the `org.apache.spark.sql.streaming.DataStreamWriter` + * as `dataframe.writeStream.queryName("query").start()`. + * This name, if set, must be unique across all active queries. + * + * @since 3.5.0 + */ + def name: String + + /** + * Returns the unique id of this query that persists across restarts from checkpoint data. + * That is, this id is generated when a query is started for the first time, and + * will be the same every time it is restarted from checkpoint data. Also see [[runId]]. + * + * @since 3.5.0 + */ + def id: UUID + + /** + * Returns the unique id of this run of the query. That is, every start/restart of a query will + * generate a unique runId. Therefore, every time a query is restarted from + * checkpoint, it will have the same [[id]] but different [[runId]]s. + */ + def runId: UUID + + /** + * Returns the `SparkSession` associated with `this`. + * + * @since 3.5.0 + */ + def sparkSession: SparkSession + + /** + * Returns `true` if this query is actively running. + * + * @since 3.5.0 + */ + def isActive: Boolean + + /** + * Returns the [[StreamingQueryException]] if the query was terminated by an exception. + * @since 3.5.0 + */ + def exception: Option[StreamingQueryException] + + /** + * Returns the current status of the query. + * + * @since 3.5.0 + */ + def status: StreamingQueryStatus + + /** + * Returns an array of the most recent [[StreamingQueryProgress]] updates for this query. + * The number of progress updates retained for each stream is configured by Spark session + * configuration `spark.sql.streaming.numRecentProgressUpdates`. + * + * @since 3.5.0 + */ + def recentProgress: Array[StreamingQueryProgress] + + /** + * Returns the most recent [[StreamingQueryProgress]] update of this streaming query. + * + * @since 3.5.0 + */ + def lastProgress: StreamingQueryProgress + + /** + * Waits for the termination of `this` query, either by `query.stop()` or by an exception. + * If the query has terminated with an exception, then the exception will be thrown. + * + * If the query has terminated, then all subsequent calls to this method will either return + * immediately (if the query was terminated by `stop()`), or throw the exception + * immediately (if the query has terminated with exception). + * + * @throws StreamingQueryException if the query has terminated with an exception. + * + * @since 3.5.0 + */ + @throws[StreamingQueryException] + def awaitTermination(): Unit + + /** + * Waits for the termination of `this` query, either by `query.stop()` or by an exception. + * If the query has terminated with an exception, then the exception will be thrown. + * Otherwise, it returns whether the query has terminated or not within the `timeoutMs` + * milliseconds. + * + * If the query has terminated, then all subsequent calls to this method will either return + * `true` immediately (if the query was terminated by `stop()`), or throw the exception + * immediately (if the query has terminated with exception). + * + * @throws StreamingQueryException if the query has terminated with an exception + * + * @since 3.5.0 + */ + @throws[StreamingQueryException] + def awaitTermination(timeoutMs: Long): Boolean + + /** + * Blocks until all available data in the source has been processed and committed to the sink. + * This method is intended for testing. Note that in the case of continually arriving data, this + * method may block forever. Additionally, this method is only guaranteed to block until data that + * has been synchronously appended data to a `org.apache.spark.sql.execution.streaming.Source` + * prior to invocation. (i.e. `getOffset` must immediately reflect the addition). + * @since 3.5.0 + */ + def processAllAvailable(): Unit + + /** + * Stops the execution of this query if it is running. This waits until the termination of the + * query execution threads or until a timeout is hit. + * + * By default stop will block indefinitely. You can configure a timeout by the configuration + * `spark.sql.streaming.stopTimeout`. A timeout of 0 (or negative) milliseconds will block + * indefinitely. If a `TimeoutException` is thrown, users can retry stopping the stream. If the + * issue persists, it is advisable to kill the Spark application. + * + * @since 3.5.0 + */ + @throws[TimeoutException] + def stop(): Unit + + /** + * Prints the physical plan to the console for debugging purposes. + * @since 3.5.0 + */ + def explain(): Unit + + /** + * Prints the physical plan to the console for debugging purposes. + * + * @param extended whether to do extended explain or not + * @since 3.5.0 + */ + def explain(extended: Boolean): Unit +} + +class RemoteStreamingQuery( + override val id: UUID, + override val runId: UUID, + override val name: String, + override val sparkSession: SparkSession) extends StreamingQuery { + + override def isActive: Boolean = { + executeQueryCmdWith(_.setStatus(true)).getStatus.getIsActive + } + + override def exception: Option[StreamingQueryException] = { + throw new UnsupportedOperationException("exception is not yet implemented") + } + + override def status: StreamingQueryStatus = { + val statusResp = executeQueryCmdWith(_.setStatus(true)).getStatus + new StreamingQueryStatus( + message = statusResp.getStatusMessage, + isDataAvailable = statusResp.getIsDataAvailable, + isTriggerActive = statusResp.getIsTriggerActive + ) + } + + override def recentProgress: Array[StreamingQueryProgress] = { + executeQueryCmdWith(_.setRecentProgress(true)) + .getRecentProgress + .getRecentProgressJsonList + .asScala + .map(json => new StreamingQueryProgress(json)) + .toArray + } + + override def lastProgress: StreamingQueryProgress = { + executeQueryCmdWith(_.setLastProgress(true)) + .getRecentProgress + .getRecentProgressJsonList + .asScala + .headOption + .map(json => new StreamingQueryProgress(json)) + .orNull + } + + override def awaitTermination(): Unit = { + throw new UnsupportedOperationException("awaitTermination() is not yet implemented") + } + + override def awaitTermination(timeoutMs: Long): Boolean = { + throw new UnsupportedOperationException("awaitTermination() is not yet implemented") + } + + override def processAllAvailable(): Unit = { + executeQueryCmdWith(_.setProcessAllAvailable(true)) + } + + override def stop(): Unit = { + executeQueryCmdWith(_.setStop(true)) + } + + override def explain(): Unit = { + explain(extended = false) + } + + override def explain(extended: Boolean): Unit = { + val explainCmd = StreamingQueryCommand + .ExplainCommand.newBuilder() + .setExtended(extended) + .build() + + val explain = executeQueryCmdWith(_.setExplain(explainCmd)) + .getExplain + .getResult + + // scalastyle:off println + println(explain) + // scalastyle:on println + } + + private def executeQueryCmdWith( + buildCmdFn: StreamingQueryCommand.Builder => StreamingQueryCommand.Builder + ): StreamingQueryCommandResult = { + val queryId = StreamingQueryInstanceId + .newBuilder() + .setId(id.toString) + .setRunId(runId.toString) + .build() + + val queryCmd = buildCmdFn( + StreamingQueryCommand + .newBuilder() + .setQueryId(queryId) + ).build() + + executeQueryCmd(queryCmd) + } + + private def executeQueryCmd(queryCmd: StreamingQueryCommand) + : StreamingQueryCommandResult = { + + val cmd = Command + .newBuilder() + .setStreamingQueryCommand(queryCmd) + .build() + + val resp = sparkSession.execute(cmd).head + + if (!resp.hasStreamingQueryCommandResult) { + throw new RuntimeException("Unexpected missing response for streaming query command") + } + + resp.getStreamingQueryCommandResult + } +} + +object RemoteStreamingQuery { + + def fromStartCommandResponse( + sparkSession: SparkSession, + response: ExecutePlanResponse): RemoteStreamingQuery = { + + if (!response.hasWriteStreamOperationStartResult) { + throw new RuntimeException("Unexpected response does not contain start stream result") + } + + val result = response.getWriteStreamOperationStartResult + + new RemoteStreamingQuery( + id = UUID.fromString(result.getQueryId.getId), + runId = UUID.fromString(result.getQueryId.getRunId), + name = if (result.getName.isEmpty) null else result.getName, + sparkSession = sparkSession + ) + } +} + +// TODO(SPARK-XXXXX) Review Comment: Remove? -- This is an automated message from the Apache Git Service. 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