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[SW-1658][rel-3.26] Figure out better way of caching MOJOs (v1 & v2) (#…
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scoring/src/main/scala/ai/h2o/sparkling/ml/models/H2OMOJOBaseCache.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 ai.h2o.sparkling.ml.models | ||
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| import org.apache.spark.expose.Logging | ||
| import org.apache.spark.sql.SparkSession | ||
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| import scala.collection.mutable | ||
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| trait H2OMOJOBaseCache[B, M] extends Logging { | ||
| private object Lock | ||
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| private val pipelineCache = mutable.Map.empty[String, B] | ||
| private val lastAccessMap = mutable.Map.empty[String, Long] | ||
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| private lazy val sparkConf = SparkSession.builder().getOrCreate().sparkContext.getConf | ||
| private lazy val cleanupRetryTimeout = sparkConf.getInt("spark.ext.h2o.mojo.destroy.timeout", 10 * 60 * 1000) | ||
| private val cleanerThread = new Thread() { | ||
| override def run(): Unit = { | ||
| while (!Thread.interrupted()) { | ||
| try { | ||
| Thread.sleep(cleanupRetryTimeout) | ||
| val toDestroy = lastAccessMap.flatMap { case (uid, lastAccess) => | ||
| val currentDiff = System.currentTimeMillis() - lastAccess | ||
| if (currentDiff > cleanupRetryTimeout) { | ||
| logDebug(s"Removing mojo $uid from cache as it has not been used for $cleanupRetryTimeout ms.") | ||
| Some(uid) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
| Lock.synchronized { | ||
| toDestroy.map { uid => | ||
| lastAccessMap.remove(uid) | ||
| pipelineCache.remove(uid) | ||
| } | ||
| } | ||
| } catch { | ||
| case _: InterruptedException => Thread.currentThread.interrupt() | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| logDebug("Cleaner thread for unused MOJOs started.") | ||
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| def startCleanupThread(): Unit = { | ||
| if (!cleanerThread.isAlive) { | ||
| cleanerThread.start() | ||
| } | ||
| } | ||
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| def getMojoBackend(uid: String, bytesGetter: ()=> Array[Byte], model: M): B = Lock.synchronized { | ||
| if (!pipelineCache.contains(uid)) { | ||
| //println(s"MISS MOJO pipeline: thread=${Thread.currentThread().getName}, this=${this}") | ||
| pipelineCache.put(uid, loadMojoBackend(bytesGetter(), model)) | ||
| } | ||
| lastAccessMap.put(uid, System.currentTimeMillis()) | ||
| pipelineCache(uid) | ||
| } | ||
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| def loadMojoBackend(mojoData: Array[Byte], model: M): B | ||
| } |
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