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Add Trigger and ProcessingTime to control how to execute a batch
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70 changes: 70 additions & 0 deletions
70
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/Trigger.scala
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| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.spark.sql.execution.streaming | ||
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| import org.apache.spark.internal.Logging | ||
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| /** | ||
| * A interface that indicates how to run a batch. | ||
| */ | ||
| trait Trigger { | ||
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| /** | ||
| * Execute batches using `batchRunner`. If `batchRunner` runs `false`, terminate the execution. | ||
| */ | ||
| def execute(batchRunner: () => Boolean): Unit | ||
| } | ||
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| /** | ||
| * A trigger that runs a batch every `intervalMs` milliseconds. | ||
| */ | ||
| case class ProcessingTime(intervalMs: Long) extends Trigger with Logging { | ||
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| require(intervalMs >= 0, "the interval of trigger should not be negative") | ||
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| override def execute(batchRunner: () => Boolean): Unit = { | ||
| while (true) { | ||
| val batchStartTimeMs = System.currentTimeMillis() | ||
| if (!batchRunner()) { | ||
| return | ||
| } | ||
| if (intervalMs > 0) { | ||
| val batchEndTimeMs = System.currentTimeMillis() | ||
| val batchElapsedTimeMs = batchEndTimeMs - batchStartTimeMs | ||
| if (batchElapsedTimeMs > intervalMs) { | ||
| logWarning("Current batch is falling behind. The trigger interval is " + | ||
| s"${intervalMs} milliseconds, but spent ${batchElapsedTimeMs} milliseconds") | ||
| } | ||
| waitUntil(nextBatchTime(batchEndTimeMs)) | ||
| } | ||
| } | ||
| } | ||
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| private def waitUntil(time: Long): Unit = { | ||
| var now = System.currentTimeMillis() | ||
| while (now < time) { | ||
| Thread.sleep(time - now) | ||
| now = System.currentTimeMillis() | ||
| } | ||
| } | ||
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| /** Return the next multiple of intervalMs */ | ||
| def nextBatchTime(now: Long): Long = { | ||
| (now - 1) / intervalMs * intervalMs + intervalMs | ||
| } | ||
| } |
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32
sql/core/src/test/scala/org/apache/spark/sql/execution/streaming/ProcessingTimeSuite.scala
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| @@ -0,0 +1,32 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.spark.sql.execution.streaming | ||
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| import org.apache.spark.SparkFunSuite | ||
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| class ProcessingTimeSuite extends SparkFunSuite { | ||
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| test("nextBatchTime") { | ||
| val processingTime = ProcessingTime(100) | ||
| assert(processingTime.nextBatchTime(1) === 100) | ||
| assert(processingTime.nextBatchTime(99) === 100) | ||
| assert(processingTime.nextBatchTime(100) === 100) | ||
| assert(processingTime.nextBatchTime(101) === 200) | ||
| assert(processingTime.nextBatchTime(150) === 200) | ||
| } | ||
| } |
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